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Programmer’s Reference
4-32
Copyright © ARM Limited 2000. All rights reserved.
4.6.2
MMC registers
The SPI mode provides access to three registers, as shown in Table 4-21. Register are
accessed using command messages.
4.6.3
MMC command summary
Table 4-22 provides a summary of the MMC commands available in SPI mode. The
main difference is that commands related to multiblock transfers and software
addressing are not available. Individual cards are addressed by asserting the appropriate
chip-select signals.
Table 4-21 MMC register in SPI mode
Name
Size
(bytes)
Description
CID
16
Card identification
data
CSD
16
Card specific data
OCR
Operation condition
register (optional)
Table 4-22 MMC command summary
SPI
Index
Name
Function
CMD0
GO_IDLE_STATE
Reset card to idle state
CMD1
SEND_OP_COND
Request and confirm operating conditions
CMD9
SEND_CSD
Request card to send CSD data
CMD10
SEND_CID
Request card to send ID number
CMD13
SEND_STATUS
Request card to send status
CMD16
SET_BLOCKLEN
Set block length for block commands
CMD17
READ_SINGLE_BLOCK
Read a single block
CMD27
PROGRAM_CSD
Protect writable bits in CSD register
CMD28
SET_WRITE_PROT
Protection ON for addressed group
CMD29
CLR_WRITE_PROT
Protection OFF for dressed group
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