Maxim Integrated MAX32665 - Table 8-51: Summary of How Register Settings Determine Type of Data Transfer; Table 8-52: SDHC Command Register

MAX32665-MAX32668 User Guide
Maxim Integrated Page 190 of 457
Table 8-51: Summary of how register settings determine type of data transfer
Multi/Single Block Select
SDHC_TRANS.multi
Block Count Enable
SDHC_TRANS.blk_cnt_en
Block Count
SDHC_BLK_CNT.trans
Function
0
N.A.
N.A.
Single transfer
1
0
N.A.
Infinite transfer
1
1
≠0
Multiple transfer
1
1
0
Stop Multiple transfer
Table 8-52: SDHC Command Register
Command Register
SDHC_CMD
[0x000E]
Bits
Name
Access
Reset
Description
31:14
-
R/W
NA
Reserved for Future Use
Do not modify this field.
13:8
idx
R/W
0
Command Index
Valid command number (CMD0-63, ACMD0-63) per the SD Physical Specification and
SDIO Card Specification.
7:6
type
R/W
0
Command Type
The following table lists the values for this field, the type of command, and provides
notes about what the command type is typically used for:
type
Value
Command Type
Notes
0b11
Abort
CMD12, CMD52 for writing I/O Abort in CCCR.
0b10
Resume
CMD52 for writing Function Select in CCCR.
0b01
Suspend
CMD52 for writing Bus Suspend in CCCR.
0b00
Normal
Other commands
5
data_pres_sel
R/W
0
Data Present Select
1: Set to indicate data is present and transferable using the DAT line.
0: Commands that only use the CMD line (for example, CMD52), commands with no
data transfer but are using the busy signal on SDHC_DAT[0], or a Resume
command.
4
idx_chk_en
R/W
0
Command Index Check Enable
1: SDHC checks the index field in the response and sets a Command Index Error if it
does not match the value in the SDHC_CMD.idx field.
0: Index of response is not checked.
3
crc_chk_en
R/W
0
Command CRC Check Enable
1: SDHC verifies the CRC field in the response, and if an error is detected, it is
reported as a Command CRC Error.
0: CRC not checked by hardware.
2
-
R/W
0
Reserved for Future Use
Do not modify this field.
1:0
resp_type
R/W
0
Response Type Select
0b00: No Response
0b01: Response Length 136
0b10: Response Length 48
0b11: Response Length 48, and check if busy after response