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NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 921 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
[13:8]
CMD_CODE
SD Command Code
This register contains the SD command code (0x00
– 0x3F).
[7]
CLK_KEEP0
SD Host Port 0 Clock Keep Running Enable
0 = SD host port 0 clock generation controlled by SD host automatically.
1 = SD host port 0 clock always keeps free running.
[6]
CLK8_OE
Generating 8 Clock Cycles Output Enable
0 = No effect. (Please use SW_RST (SDH_CTL[14]) to clear this bit.)
1 = Enable, SD host will output 8 clock cycles.
NOTE:
When operation is finished, this bit will be cleared automatically, so don’t write 0 to
this bit (the controller will be abnormal).
[5]
CLK74_OE
Initial 74 Clock Cycles Output Enable
0 = No effect. (Please use SW_RST (SDH_CTL[14]) to clear this bit.)
1 = Enable, SD host will output 74 clock cycles to SD card.
NOTE:
When operation is finished, this bit will be cleared
automatically, so don’t write 0 to
this bit (the controller will be abnormal).
[4]
R2_EN
Response R2 Input Enable
0 = No effect. (Please use SW_RST (SDH_CTL[14]) to clear this bit.)
1 = Enable, SD host will wait to receive a response R2 from SD card and store the response
data into DMAC’s flash buffer (exclude CRC-7).
NOTE:
When operation is finished, this bit will be cleared automatically, so don’t write 0 to
this bit (the controller will be abnormal).
[3]
DO_EN
Data Output Enable
0 = No effect. (Please use SW_RST (SDH_CTL[14]) to clear this bit.)
1 = Enable, SD host will transfer block data and the CRC-16 value to SD card.
NOTE:
When operation is finished, this bit will be cleared automatically, so don’t write 0 to
this bit (the controller will be abnormal).
[2]
DI_EN
Data Input Enable
0 = No effect. (Please use SW_RST (SDH_CTL[14]) to clear this bit.)
1 = Enable, SD host will wait to receive block data and the CRC-16 value from SD card.
NOTE:
When operation is finished, this bit will be cleared automati
cally, so don’t write 0 to
this bit (the controller will be abnormal).
[1]
RI_EN
Response Input Enable
0 = No effect. (Please use SW_RST (SDH_CTL[14]) to clear this bit.)
1 = Enable, SD host will wait to receive a response from SD card.
NOTE:
When operati
on is finished, this bit will be cleared automatically, so don’t write 0 to
this bit (the controller will be abnormal).
[0]
CO_EN
Command Output Enable
0 = No effect. (Please use SW_RST (SDH_CTL[14]) to clear this bit.)
1 = Enable, SD host will output a command to SD card.
NOTE:
When operation is finished, this bit will be cleared automatically, so don’t write 0 to
this bit (the controller will be abnormal).