1
0
mmc_dat3
...
b7
b3
b7
b3
LSB
MSB
CRC
1
0
...
b6
b2
b6
b2
CRC
1
0
...
b5
b1
b5
b1
CRC
1
0
...
b4
b0
b4
b0
CRC
Block length *2
mmc_dat2
mmc_dat1
mmc_dat0
0
1
mmc_dat0
...
...
...
LSB
MSB
Block data
CRC
Block length *8
b7
b6
b1
b0
b7
b6
b1
b0
0
...
...
b7
b6
b1
b0
...
LSB
MSB
Sequential data
b7
b6
b1
b0
1
mmc_dat0
Functional Description
Coding Scheme for Data Token
Data tokens always start with 0 and end with 1 (see
, and
).
Figure 18-13. Data Packet for Sequential Transfer (1-Bit)
Figure 18-14. Data Packet for Block Transfer (1-Bit)
Figure 18-15. Data Packet for Block Transfer (4-Bit)
3356
Multimedia Card (MMC)
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated