MAX32665-MAX32668 User Guide
Maxim Integrated Page 187 of 457
Table 8-47: SDHC SDMA Block Size Register
Reserved for Future Use
Do not modify this field.
Host SDMA Buffer Size
This field specifies the size of the contiguous buffer in the system memory for SDMA
transfers. SDMA transfers larger than this buffer generates a SDHC DMA interrupt
(SDHC_INT_STAT.dma) when the transfer reaches the host_buf size boundary. The
SDMA transfer pauses until the card driver updates the SDMA System Address
(SDHC_SDMA) register with the next buffer address to transfer and clears the SDHC
DMA interrupt flag. When the SDMA transfer is complete, a SDHC transfer complete
interrupt (SDHC_INT_STAT.trans_comp = 1) is generated. The SDHC DMA interrupt
flag is not set when the SDMA transfer completes.
Host SDMA
Buffer Size (KB)
Note: This field is used for SDMA transfers only.
Data Transfer Block Size
Sets the block size of data transfers for CMD17, CMD18, CMD24, CMD25, and CMD53.
You can set values ranging from 1 up to the maximum buffer size. Setting this field to
0 indicates there is no data to transfer.
During a transfer, reading this field might return an invalid value, and writes to this
field are ignored.
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