Espressif ESP32 Technical Reference Manual page 211

9 SD/MMC Host Controller
31
DATA_TIMEOUT Value for card data read timeout. This value is also used for data starvation by
host timeout. The timeout counter is started only after the card clock is stopped. This value is
specified in number of card output clocks, i.e. cclk_out of the selected card.
NOTE: The software timer should be used if the timeout value is in the order of 100 ms. In this
case, read data timeout interrupt needs to be disabled. (R/W)
RESPONSE_TIMEOUT Response timeout value. Value is specified in terms of number of card output
clocks, i.e., cclk_out. (R/W)
31
0x00000
CARD_WIDTH8 One bit per card indicates if card is in 8-bit mode.
0: Non 8-bit mode;
1: 8-bit mode.
Bit[17:16] correspond to card[1:0] respectively. (R/W)
CARD_WIDTH4 One bit per card indicates if card is 1-bit or 4-bit mode.
0: 1-bit mode;
1: 4-bit mode.
Bit[1:0] correspond to card[1:0] respectively. Only NUM_CARDS*2 number of bits are imple-
mented. (R/W)
31
0 0 0 0 0 0 0
BLOCK_SIZE Block size. (R/W)
Espressif Systems
Register 9.5. TMOUT_REG (0x0014)
0x0FFFFFF
Register 9.6. CTYPE_REG (0x0018)
18 17
0x00000
Register 9.7. BLKSIZ_REG (0x001C)
0 0 0 0 0 0 0 0
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16 15
0x00000
16 15
0 0x00200
211
8 7
0x040
2 1
0x00000
ESP32 TRM (Version 5.2)
0
Reset
0
Reset
0
Reset