Texas Instruments TMS320DM644x Manuel D’Utilisation
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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.
match the block length setting in the memory card.
The MMC block length register (MMCBLEN) is shown in
and described in
.
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.
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.
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