TMS320DM644x DMSoC Multimedia Card (MMC)/Secure Digital (SD) Card Controller User's Guide

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4.8 MMC Block Length Register (MMCBLEN)
Registers
The MMC block length register (MMCBLEN) specifies the data block length in bytes. This value must
match the block length setting in the memory card.
The MMC block length register (MMCBLEN) is shown in Figure 25 and described in Table 13 .
Figure 25. MMC Block Length Register (MMCBLEN)
31 16
Reserved
R-0
15 12 11 0
Reserved BLEN
R-0 R/W-200h
LEGEND: R/W = Read/Write; R = Read only; - n = value after reset
Table 13. MMC Block Length Register (MMCBLEN) Field Descriptions
Bit Field Value Description
31-12 Reserved 0 Reserved
11–0 BLEN 1h–FFFh Block length. This field is used to set the block length, which is the byte count of a data block. The
value 0 is prohibited.
Note: The BLEN bits value must be the same as the CSD register settings in the MMC/SD card.
To be precise, it should match the value of the READ_BL_LEN field for read, or
WRITE_BL_LEN field for write.
SPRUE30B – September 2006 Multimedia Card (MMC)/Secure Digital (SD) Card Controller 49
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