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Zynq-7000 AP SoC Technical Reference Manual www.xilinx.com 1546
UG585 (v1.11) September 27, 2016
Appendix B: Register Details
Command_CRC_Chec
k_Enable
19 rw 0x0 If this bit is set to 1, the HC shall check the CRC
field in the response. If an error is detected, it is
reported as a Command CRC Error. If this bit is
set to 0, the CRC field is not checked.
0 - Disable
1 - Enable
reserved 18 ro 0x0 Reserved
Response_Type_Select 17:16 rw 0x0 Response Type Select
00 - No Response
01 - Response length 136
10 - Response length 48
11 - Response length 48 check
Busy after response
reserved 15:6 ro 0x0 Reserved
Multi_Single_Block_Sel
ect
5 rw 0x0 This bit enables multiple block DAT line data
transfers.
0 - Single Block
1 - Multiple Block
Data_Transfer_Directio
n_Select
4 rw 0x0 This bit defines the direction of DAT line data
transfers.
0 - Write (Host to Card)
1 - Read (Card to Host)
reserved 3 ro 0x0 Reserved
Auto_CMD12_Enable 2 rw 0x0 Multiple block transfers for memory require
CMD12 to stop the transaction. When this bit is
set to 1, the HC shall issue CMD12 automatically
when last block transfer is completed. The HD
shall not set this bit to issue commands that do not
require CMD12 to stop data transfer.
0 - Disable
1 - Enable
Block_Count_Enable 1 rw 0x0 This bit is used to enable the Block count register,
which is only relevant for multiple block
transfers. When this bit is 0, the Block Count
register is disabled, which is useful in executing
an infinite transfer.
0 - Disable
1 - Enable
DMA_Enable 0 rw 0x0 DMA can be enabled only if DMA Support bit in
the Capabilities register is set. If this bit is set to 1,
a DMA operation shall begin when the HD writes
to the upper byte of Command register (00Fh).
0 - Disable
1 - Enable
Field Name Bits Type Reset Value Description