uMMC Serial Data Storage Module User Manual Features Overview
Contents
1. e uu uuu is the free space on the card e tt ttt is the total space on the card Example Q 51245 61525 A FAT12 cr 51245 61525 Read Description You can read up to 512 bytes at a time using the Read command If the num parameter is larger than the number of bytes remaining to be read from the file then only the remaining bytes are returned Use the Info command to find the current position If the Read command is successful a single sp character is sent followed by the data If an error occurs the first character returned is z followed by an error code Data is sent verbatim i e raw data from the file Format R fh num addr Parameters e fnis a file handle 1 4 Use the Free Handle command to get a free file handle e num Is the number of bytes to read Optional If not specified up to 512 bytes will be returned e addr is the address at which to start reading Optional num must be given for this parameter to be used Response Format sp response Enn response IS preceded by a sp indicating a good read The length of response is variable and depends on the num parameter the position of the file handle and the size of the file Example File handle position 0 file size 38 bytes R1 sp 13 22 02 ADC1 4 9V cr 13 22 32 ADC1 4 9V cr A subsequent read R1 E07 Same file read only 18 bytes starting at address 0 R1180 sp 13 22 02 ADC1 4 9V Read L2. slash and begins at the root directory Subdirectories are separated with forward slash o g logs january jan3 log Response Format NULL Enn Example To set read only attribute for a file A R filename txt To remove hidden and system attributes for a file A HS filename txt Copy Description This command will copy data from an open file to another open file Requirements Two files must be open one for reading and the second for writing e g sourcefile txt R RW destfile txt Copy File will copy from the current location in the source file up to num bytes if specified to the destination file starting at the destination s current location Note You can interrupt the transfer at any time by sending esc ASCII 27 HEX 0x1B Format B fhl fh2 num Parameters fhl fh2 S a file handle 1 4 Use the Free Handle command to get a free file handle e num Is the number of bytes to copy from zn1 to n2 If num is not given or is greater than the size of fhi then the entire contents of za is copied Response Format NULL response Enn response depends on the c setting shown below C 0 NULL C 1 TESSSRESSE AFFE C 2 nn nn bytes copied at r rr bytes second C 3 Wiiinn nn bytes copied at r rr bytes second Example To copy 200 bytes from the current location of handle 1 to handle 2 B 1 2 200 To copy the entire sour
3. RO GU e robotics uMMC Serial Data Storage Module User Manual Features Features Card Types SD miniSD microSD Card Format MMC SD SDHC Card Sizes 8MB 32GB FAT12 File Systems FAT16 FAT32 Control Interface TTL Serial Serial Interface 8 bits no parity 1 stop bit Serial Speeds 2400 4800 9600 19200 38400 57600 115200 230400 460800 bps ee 40 C to 85 C Physical Size 2x1 25 inches 50 8x31 75 mm Power Source 3 5 Volts Chipset Available Yes 44 lead TQFP or 44 pad QFN Overview e Supports o MMC SDC SDHC card formats All available card formats are supported From 8MB up to 32GB o FAT12 FAT16 and FAT32 o Long file names o SD miniSD and microSD form factors TTL serial host connection from 2400 460800 bps Up to 4 file handles open simultaneously for reading and or writing Random reads writes o You can read from or write to anywhere in a file o Seeking in a file allows for file pre allocation leading to faster write times File truncation Change file modification stamp Change file attributes Iterated file listings with wildcards o You can iterate through a directory listing with wildcards Direct file copy o Copy data from one file to another directly e On board Real Time Clock RTC o Files created modified have time stamps updated to current time e Configuration on card o Settings can be read from a configuration file on the card e Chipset available for OEM integratio
4. PA7 PCIE ADCS2PAE Connectors lt PCI5 ADCS PAS U XTAL2 PCI4 ADC4 PA4 lt PCI3 ADC SPAS o XTAL4 PCI2 ADC2 PA2 lt PCI1 ADC49PAL AREF PCIZ ADC PAG AUCC AGND lt PCI45 SCK gt lt PCI14 MISO gt lt PCI13 MOSDPBS PCI12 0C0B SS5 gt PB4 UPD PCI11 0C2A AIN1 PB3 qp gt gt gt gt gt gt gt PB PB6 X PCI10 INT2 RINO PB2 X PCIS CLKO T1 PB1 X PCIS TO XCKOPPBO 2 PCI23 T0SC2DPC7 ES PCI22 T0SC DPC 32 768kHz PCI21 TDDPC5 dB lt PC12 TDOPC4 d 74LUC245 PCI19 TMS PC3 PCI18 TCIOPC2 PCI17 SD amp PCA CARD1 PCI16 SCLDPCO X PCI31 0C2805PD7 PCI30 0C2B ICP PD6 K PCI28 0C185PD5 X PCI28 XCK1 0C1B PD4 PCI27 INT1 TXD15PD3 X PCI26 INTO RXD1 PD2 X PCI25 TXDO PD1 K PCI24 RXDO PDO UIN ATMEGA644PA 20A TLL LL j SD Card ON OFF BYPASS GND SD MMC Card LP29921M5 3 3 YD Lom b o Copuright 2002 2011 Rogue Robotics 33 R ACTIVITY Engineer Brett Hagman Rogue Robotics Inc UDD UCC http uuu roguerobotics com TITLE UMMC 288 f C C7 C8 9 AuFT AuFT AuFT Document Number DU regulated off board UMMC 200 Xo 3 3U regulated on board Date 1 24 2011 10 34 46 PM Sheet 1 1 C
5. 3 log Response Format NULL Enn Example M LOGS J ANUARY Rename Description Renames moves a file from one path to another Format N path newpath path and newpatn are separated by a vertical bar pipe vertical slash newpath must not already exist Parameters e path newpath is the absolute path to a file directory A properly formatted path must begin with a forward slash and begins at the root directory Subdirectories are separated with forward slash o g logs january jan3 log Response Format NULL Enn Example Rename a file N www index html www index htm Move a directory N www images images Open Description Opens a file handle in one of 4 different modes described above Note If a file is created the file modification date is set to the current time from the built in RTC Real Time Clock You can change the time by using the Time command You can modify the file modification date using the Change Timestamp command Format O fh mode path Parameters e fnis a file handle 1 4 Use the Free Handle command to get a free file handle e mode IS one of o o o R Open in read only mode No data can be written to the file The filename in the path must exist w Open in write mode This opens a new file for writing The file must not already exist The filename in the path must NOT already exist A Open in append mode This opens a new o
6. ce file to the destination file O 1 R sourcefile txt O 2 RW destfile txt B 1 2 To copy 600 bytes from position 12000 of handle 1 to handle 3 starting at position 50000 R sourcefile txt RW destfile txt 12000 50000 3 600 CG GI OO POPOP To copy the entirety of handle 1 to the end of handle 2 appended sourcefile txt W destfile txt F waooo 1 2 2 1 N Ed ZU W or note that the destination file is opened for append O 1 R sourcefile txt O 2 A destfile txt B 12 Description Closes an open file handle If no file handle is given all open file handles are closed Format C h Parameters e fn is a file handle 1 4 Use the Free Handle command to get a free file handle Response Format NULL Enn Example Close file handle 1 G 1 Close all files je Change Timestamp Description Changes the modified time of the given file directory All parameters are required Format D year month day hour min sec path Parameters year is full 4 digit year month iS 1 gt 12 day IS 1 31 depending on month hour is in 24 hour format 0 23 min is 0 gt 59 sec is 0 gt 59 e path S the absolute path to a file directory A properly formatted path must begin with a forward slash and begins at the root directory Subdirectories are separated with forward slash o g logs january jan3 log Response Format NULL Enn E
7. e Free Handle command to get a free file handle e num is the number of bytes to write to the file 1 512 Optional if not given 512 is assumed Response Format NULL Enn Example Write a line of text to a file Setting E 0 lt cr gt as EOL E LOG TXT O 1 RW LOG TXT SE 0 I 1 0 0 WL 1 13 22 02 ADC1 4 9V cr I 1 19 19 Write a line of text to a file Setting E 2 cr lf as EOL E LOG TXT O 1 RW LOG TXT S EZ SE 2 I 1 0 L 1 13 22 02 ADC1 4 9V lt cr gt I 1 20 20 File Status Description Returns the status of the system or the status of a file handle If no parameter is given the card status is returned e g If a card is not inserted zos is returned If no error a single lt sp gt is returned If a file handle is given the status of the file handle is returned e g If the file handle is pointing to the end of the file zo7 is returned Format Z fh Parameters e fn is a file handle 1 4 Use the Free Handle command to get a free file handle Response Format sp Enn Example Z sp Z2 E07 Appendix Table of Settings Setting Name Value D Baud Bit Rate 0 1 2 3 4 5 6 7 8 T Write Time out P Prompt Character L Directory Listing Style 0 1 R Response Delay C Copy Progress Style 0 1 2 3 E Read Line Write Line Terminator 0 1 2 Table of Error Codes Error Code Description De
8. e command to get a free file handle e num S the number of bytes to write to the file 1 512 Optional if not given 512 is assumed Response Format NULL Enn Example I 1 0 0 W118 13 22 02 ADC1 4 9V I 1 18 18 Write Line Description The Write Line command is very similar to the Write command The difference is that the command is terminated when a cr is received or 512 bytes whichever comes first You can write up to 512 bytes at a time with the Write Line command If num is omitted then 512 bytes will be expected After the command is received num or 512 bytes are expected to be received Data is received raw i e no escape sequences are required The Write Line command will terminate if a cr is received append the appropriate EOL End Of Line terminator depending on the Read Write Line Terminator setting and write the data to the file By default there is no time out for how long it takes to send the data This means that the UMMC will wait indefinitely for all the data to be sent If the value of the Write Time out setting is greater than 0 zero then if the time taken between sending bytes exceeds that value in tens of milliseconds the Write command will terminate write the accepted bytes to the file and return to the command prompt No EOL terminator will be written No error will be returned Format WL fh num Parameters e fh is a file handle 1 4 Use th
9. e read from the file on power up and replace the current settings A description of all of the settings can be found in the Settings section Format S setting value Parameters e setting IS the setting to be set returned See the Settings Table e value is the value to which setting should be set Optional Response Format NULL response Enn If no value is given then response is the current value of setting Example To set the bit rate to 2400 bps SD5 To get the current bit rate S D 5 Time Description Gets sets the internal RTC Real Time Clock Format T year month day hour min sec Parameters year is full 4 digit year month iS 1 gt 12 day IS 1 31 depending on month hour lS in 24 hour format 0 23 min is 0 gt 59 sec is 0 gt 59 Providing no parameters returns the current time Response Format NULL response If at least one parameter is given no response is sent response is Of the format yyyy MM DD lt sp gt HH mm SS Example Get the current RTC time 2009 05 22 13 42 02 To set the date and time to 2009 05 22 13 00 00 T 2009 5 22 13 00 00 2009 05 22 13 00 00 To change just the date to 2009 05 23 T 2009 5 23 2009 05 23 13 00 15 Truncate Description Truncates the file at the current position WARNING This will effectively delete all data after the current position in the file Use with care Format U fh Parameters e
10. fn is a file handle 1 4 Use the Free Handle command to get a free file handle Response Format NULL Enn Example I 1 1200 5000 U1 I 1 1200 1200 Version Description Returns the current firmware version and serial number Format Parameters No parameters Response Format response response IS Of the format mmm nn bxxx sp SN sss sss where mmm iS the major version code nn is the minor version code xxx IS the beta version code This is only returned in the beta versions sss sss IS the serial number code Programmed only on request Defaults to umm1 oEm Example V 102 08 b003 SN UMM1 OEM Write Description You can write up to 512 bytes at a time with the Write command If num is omitted then 512 bytes will be expected After the command is received num or 512 bytes are expected to be received Data is received raw i e no escape sequences are required By default there is no time out for how long it takes to send the data This means that the uMMC will wait indefinitely for all the data to be sent If the value of the Write Time out setting is greater than 0 zero then if the time taken between sending bytes exceeds that value in tens of milliseconds the Write command will terminate write the accepted bytes to the file and return to the command prompt No error will be returned Format W fh num Parameters e fnis a file handle 1 4 Use the Free Handl
11. h a forward slash and begins at the root directory Subdirectories are separated with forward slash o g logs january jan3 log e pattern a filename pattern which can contain wildcards and LC path returns the count of files that match the path LS path Starts a List Directory iteration process LI pattern iterates through a directory listing returning the next file that matches pattern pattern IS required just use to match everything For L path and tc path path can also contain wildcards and In Ls path path Can not contain wildcards and must point to a directory Response Format sp response Enn response has one of two formats based on the 1 setting L 0 lt lt sp gt gt D ss sss filenamel lt lt cr gt gt D ss sss filename2 lt lt cr gt gt D ss sss filenameN lt lt cr gt gt where e p indicates a directory e ss sss is the size of the file e filenamen lS the filename or directory name 1 lt lt sp gt gt DRHSA yyyy mm dd hh mm ss ss sss filenamel lt lt cr gt gt DRHSA yyyy mm dd hh mm ss ss sss filename2 lt lt cr gt gt DRHSA yyyy mm dd hh mm ss ss sss filenameN lt lt cr gt gt where e DRHSA are the attributes for the file If the attribute is not set the value is p indicates a directory yyyy mm dd hh mm ss is the modification date of the file directory e filenamen Is the filename or directory name Exa
12. ine Description The Read Line command is very similar to the Read command except that data is returned up to the next EOL terminator The z setting determines the type of EOL terminator that is checked The EOL terminator is not returned only the data up to the EOL Format RL fh num addr j Parameters e fnis a file handle 1 4 Use the Free Handle command to get a free file handle e num is the number of bytes to read Optional If not specified up to 512 bytes will be returned addr is the address at which to start reading Optional num must be given for this parameter to be used Response Format sp response Enn response IS preceded by a sp indicating a good read The length of response is variable and depends on the num parameter the position of the file handle the size of the file and the location of the next EOL Refer to the z setting Example File handle position 0 file size 38 bytes This response differs from what is returned by the Read command RL 1 sp 13 22 02 ADC1 4 9V RL1 Sp 13 22 32 ADC1 4 9V RL1 E07 Same file read only 18 bytes starting at address 0 RL 1180 sp 13 22 02 ADC1 4 9V Settings Description Settings are non volatile and are loaded on power up When the unit is put into Update Mode the default setting values shown in the settings table are restored Settings can also be set using the Boot Config File The settings ar
13. mple p setting 0 L lt sp gt D DCIM lt cr gt 721886 B0000 mp3 lt cr gt 40192 B0001 mp3 lt cr gt 23318 B0002 mp3 lt cr gt 46519 hidden txt lt cr gt D setting 1 L sp D 2009 05 10 11 03 54 DCIM cr A 721886 2009 05 13 10 12 16 B0000 mp3 cr A 40192 2009 05 13 10 12 16 B0001 mp3 cr A 23318 2009 05 13 10 12 16 B0002 mp3 cr H A 46519 2009 05 13 10 22 38 hidden txt cr Using wildcards L PICTURES PG sp A 2008 09 23 09 18 32 2021392 IMG 2538 PG cr A 2008 09 23 09 31 26 1662290 IMG 2542 PG cr A 2008 09 23 09 32 02 1893947 IMG 2543 PG cr A 2008 10 30 12 34 50 1117269 IMG 2551 PG cr File count with wildcard LC PICTURES PG Sp 4 Iteration example LS PICTURES Sp LI JPG C A 2008 09 23 09 18 32 2021392 IMG 2538 J PG cr PG LI Sp A 2008 09 23 09 32 02 1893947 IMG 2543 PG cr LI JPG Sp A 2008 10 30 12 34 50 1117269 IMG 2551 PG cr LI JPG E07 J sp A 2008 09 23 09 31 26 1662290 IMG_2542 J PG cr JPG Make Directory Description The Make Directory command will create a directory at the path specified Format M path Parameters vy e path is the absolute path to a file directory A properly formatted path must begin with a forward slash and begins at the root directory Subdirectories are separated with forward dish o g logs january jan
14. n Single TQFP or QFN component e 40 C to 85 C operating temperature range e ROHS compliant 1 Time must be set after power up 2 On power up only System Diagram Host u M M C System Diagram Controller Command Processor PHYS Card Layer File Level Subsystem File Handle 4 File Handle 3 File Handle 2 3 3V LDO FAT File System Sublayer Specifications and Standards Electrical Characteristics Absolute Maximum Ratings Operating Temperature 55 C to 125 C Storage Temperature 65 C to 150 C Voltage on any pin 0 5V to Vcc 0 5V Maximum Operating Voltage 6 0V WARNING Exceeding values beyond these absolute maximum values may cause permanent damage to the device and or card Operating at absolute maximum rating conditions for extended periods may affect device and or card reliability DC Characteristics Parameter Min Typ Max Units Power Supply Current Icc Idle Vcc 5V No card 11 15 mA Icc Idle Vcc 3V No card 5 5 8 mA Icc Idle Vcc 5V w card 12 4042 mA Icc Idle Vcc 3V w card 6 30 2 mA Icc Active R W Vcc 5V 25 25024 mA Logic Input Low 0 5 0 2 Vcc2 V Logic Input High 0 6 Vcc9 V Logic Output Low Vcc 5V 0 7 V Logic Output Low Vcc 3V 0 5 V Logic Output High Vcc 5V 4 0 V Logic Output High Vcc 3V 2 2 V 1 2 3 Because card active and idle current values vary widely from brand to brand a maximum cannot determined Please refer to your card manufacturers specification
15. ommand character e sp IS a single space character ASCII 32 HEX 0x20 e Parameterl Parameter2 are parameters associated with the command cr IS a carriage return character ASCII 13 HEX 0x0d Command Listing Format C Parameterl Parameter2 Parameter3 e c is the command character A single character e Parameter1 is the first parameter for the command e Parameter2 is the second parameter for the command If it is listed inside of square brackets then the parameter is optional Any parameters listed inside of square brackets are optional Most commands that have optional parameters will require the previous parameter to be given Command Response Format In general responses are of the format sp data Enn Error codes are returned as gna where nn is a hexadecimal code indicating the error See the table of error codes Command Set Set Attributes Description Change the attributes of a file In the FAT file system there are 4 attributes which can be set e A Archive e H Hidden e R Read Only e S System Note You can not combine adding and removing of attributes in a single command i e you must only add or only remove attributes per command Format A attribute path Parameters e attribute IS one or more of R H S or A e path S the absolute path to a file directory A properly formatted path must begin with a forward
16. r existing file for writing Once opened the file handle is positioned at the end of the file If the filename in the path does not exist it will be created nw Open in read write mode This opens a new or existing file for reading and or writing Once opened the file handle is positioned at the beginning of the file If the filename in the path does not exist it will be created e path is the absolute path to a file directory A properly formatted path must begin with a forward slash and begins at the root directory Subdirectories are separated with forward slash o e 0 logs january jan3 log Response Format NULL Enn Example Open a file for reading O 1 R LOGS JANUARY JAN03 LOG Open a file for reading and writing O 1 RW www httpdocs chatlog chatlog002 log Query Volume Description Returns the free space and the total size of the inserted card The two values given are in decimal format and in kibibytes i e 1024 bytes per kibibyte Format Q A Parameters e a displays the file system type as well as the free total information Response Format response Enn If there are no parameters response is of the form uu uuu tt ttt where e uu uuu is the free space on the card e tt ttt is the total space on the card If A parameter is given response is of the form FATff cr uu uuu tt ttt where e FATff is the file system type one of FAT12 FAT16 or FAT32
17. s for read write current consumption values 4 This is the maximum current that the on board LDO regulator will supply Cards that require more power than this are not supported 5 Max means the highest value where the pin is guaranteed to be read as low 6 Min means the lowest value where the pin is guaranteed to be read as high Timing Characteristics Parameter Min Typ Max Units Serial Speed 2400 460800 bps Power up delay no card 200 ms Power up delay w card 200 250 400 ms Card initialization time 30 80 20042 ms 2 Card communication timing will vary widely from brand to brand depending on many factors 1 This is the amount of time taken to initialize a card after insertion and a command has been sent but before the command has been executed Communications Protocol Description The Protocol for the UMMC employs a simple but robust asynchronous serial control protocol A command prompt gt greater than symbol ASCII 62 HEX 0x3E indicates that the uMMC is ready to accept a command A command can be sent a response will be returned and the command prompt will be sent again Example F lt cr gt 1 gt If an error occurs while processing a command an error is returned in the format Enn See the table of error codes Example gt O 1 R LOGS 2004 FEBRUARY FEB30 LOG lt cr gt EF2 gt Command Format C sp Parameterl sp Parameter2 sp cr Where e c is a single c
18. scription default 0 to 254 Time in 10 ms increments e g 20 200 ms 0 No time out waits indefinitely 1 to 254 62 gt O to 254 Time in 10 ms increments e g 5 50 ms 0 No response delay immediate response progress hash every 2048 bytes total bytes copied amp copy rate progress hash bytes copied amp copy rate 02 03 04 05 06 07 08 09 OA E5 E6 E7 E8 E9 EA EB ED EF Fl F2 F3 F4 F5 F6 Command buffer overrun i e command too long No free files Unknown command Card initialization error Command formatting error End of file EOF Card not inserted Card reset failure Card physically write protected check write protect switch on side of card Not a directory Read only file Can not perform command on this file Not a file command expected a directory Write failure Improper mode for writing check that the file is open for writing No free space card is full Given file handle is not open Improper mode for reading check that the file is open for reading Unrecognized mode specified in Open command General FAT failure File system is corrupted test it on a PC File handle provided is already open File in path specified does not exist Error while creating directory entry File already exists File in path specified is not valid check spelling and no strange characters in path Invalid handle specified uMMC Data Module Controller RESET lt PCIZ ADC7 gt
19. tes 3 CID 16 bytes 4 OCR 4 bytes Card type is one of Card type Description 1 MMC MultiMedia Card 2 SD V1 Secure Digital Card 4 SD V2 Secure Digital Card 12 SDHC Secure Digital High Capacity Card CSD CID and OCR are all sent as ASCII encoded i e Two ASCII characters for each raw byte Format K B T Parameters e B optional parameter to return ASCII encoded CSD and CID e I optional parameter to return more data in ASCII encoded form Response Format SP response Enn See examples for format of response Example K SP 16RAWBYTES KB SP 002600321F5983CAFEFACFFF924040C103534453443235365540116A94003C29 K I SP Card type 2 CSD 002600321F5983C4FEFACFFF924040C1 CI D 03534453443235365540116A94003C29 OCR 80FF8000 List Directory Description The List Directory command will list all the files in a given path If the path is a file then only the details for that file are given If the path contains wildcards then the files matching the pattern will be returned List Directory 1 path lists all files that match path without interruption If a directory is large this can be difficult to manage In that case use rs path to begin a directory listing iteration process then use r pattern to iterate through the listings Format L path LC path LS path LI pattern Parameters e path is the absolute path to a file directory A properly formatted path must begin wit
20. tion Jumps to any location in a file If you use as the second parameter Jump will seek to the end of the file Note If the file is opened for writing the Jump command will automatically extend the file if aaar specified is larger than the file size This is useful for pre allocating a file to reduce delays during writing Important If the file is extended the data beyond the end of the file is undefined so care must be taken to ensure your data is terminated properly You can use this command in junction with the Truncate command to pre allocate then truncate the file Format J fh addr E Parameters e fnis a file handle 1 4 Use the Free Handle command to get a free file handle e addr is the position to which you want to jump seek e F can be used to jump to the end of the file Response Format NULL Enn Example To jump to byte position 2000 in file handle 1 J 12000 To jump to the end of file handle 2 EZ Card Info Description Gets card specific information for the inserted card If no parameters are given then the raw byte data for the CSD 16 bytes and CID 16 bytes are returned 32 raw bytes total If the parameter is e then the CSD and CID are ASCII encoded i e Two ASCII characters for each raw byte e g Ox3E is sent as 3z two characters n n If the parameter is then more data is returned separated by CR 1 Card type 2 CSD 16 by
21. xample D 2009 811 17 22 00 filename txt Erase File Description Erases deletes the given file directory If the path given is a directory it must be empty before it can be deleted Format E path Parameters e path S the absolute path to a file directory A properly formatted path must begin with a forward slash and begins at the root directory Subdirectories are separated with forward slash o g logs january jan3 log Response Format NULL Enn Example To delete a directory E emptydir To delete a file E filename txt Free Handle Description Free Handle returns the next available file handle Format F Parameters None Response Format n Enn e nis the free handle number 1 4 Example When no files are open F 1 When all files are open F E03 Info Description Gives the file position and the file size for the given file handle Format I fh Parameters e rh is a file handle 1 4 Use the Free Handle command to get a free file handle Response Format response Enn response IS in the following format pp ppp ss sss where pp ppp S the current byte position in the file e ss sss IS the file size pp ppp and ss sss are separated by a forward slash Example For a file handle whose byte position is 3250 for a file which is a total of 560700 bytes I 1 3250 560700 Jump Descrip
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