S3C2400 Datasheet, PDF (382/488 Pages) Samsung semiconductor – RISC MICROPROCESSOR

S3C2400 RISC MICROPROCESSOR
MMC INTERFACE
MMC COMMAND RELATED REGISTER (MMCRR)
Register
MMCRR
Address
0x15A00004(Li/B, Li/HW, Li/W, Bi/W)
0x15A00006(Bi/HW)
0x15A00007(Bi/B)
R/W
R/W
Description
MMC Command Related
Register
Reset Value
0x00
MMCRR
Bit
Description
Response Type
(RTYP)
[7:6] Determines what response type MMC command is.
00 = no response,
01 = short type (5 byte)
10 = short & busy type (5 byte),
11 = long type (16 byte)
Multi Block Mode [5] Determines whether MMC command type is MULTI or not.
(MULTI)
0 = normal mode,
1 = multi mode
Sequential Mode
(SEQ)
[4] Determines whether MMC command type is SEQ or not.
0 = normal mode,
1 = sequential mode
Data Stop
Command
(STOP)
[3] Determines whether MMC command function is STOP or not.
0 = not stop command,
1 = stop command
Data Read
Command
(RCMD)
[2] Determines whether MMC command function is READ or not.
0 = not read command,
1 = read command
Data Write
Command
(WCMD)
[1] Determines whether MMC command function is WRITE or not.
0 = not write command,
1 = write command
Command Start
(CMST)
[0] Determines whether MMC command operation starts or not.
0 = command ready,
1 = command start
Initial State
00
0
0
0
0
0
0
NOTE: When you are going to operate STOP command, confirm transmit(or receive) all the data to send (or get). And
then, you can execute STOP command. But, in the case of sequential(SEQ) write(WCMD) command, you should
but also watch Tx FIFO's count number whether zero or not.
19-5