Altera cyclone V Technical Reference page 977

cv_5v4
2016.10.28
Transfer Type
Multiple-block write
Multiple-block write
Auto-Stop Generation for SD Cards
Table 14-13: Auto-Stop Generation for SD Cards
Transfer Type
Single-block read
Single-block write
Multiple-block read
Multiple-block read
Multiple-block write
Multiple-block write
Auto-Stop Generation for SDIO Cards
Table 14-14: Auto-Stop Generation for SDIO Cards
Transfer Type
Single-block read
Single-block write
Multiple-block read
Multiple-block read
Multiple-block write
Multiple-block write
Non-Data Transfer Commands that Use Data Path
Some SD/SDIO non-data transfer commands (commands other than read and write commands) also use
the data path.
an MMC card, the host software can perform a predefined data transfer in two ways: 1) Issue the CMD23
command before issuing CMD18/CMD25 commands to the card – in this case, issue CMD18/CMD25
commands without setting the send_auto_stop bit. 2) Issue CMD18/CMD25 commands without issuing
CMD23 command to the card, with the send_auto_stop bit set. In this case, the multiple-block data transfer
is terminated by an internally-generated auto-stop command after the programmed byte count.
SD/MMC Controller
Send Feedback
Byte Count send_auto_stop bit
0 No
†
>0 Yes
(47)
†
Byte Count send_auto_stop bit
>0 No
>0 No
0 No
>0 Yes
0 No
>0 Yes
†
Byte Count send_auto_stop bit
>0 No
>0 No
0 No
>0 No
0 No
>0 No
Auto-Stop Generation for SD Cards
set
Open-ended multiple block
Pre-defined multiple block
set
Byte count = 0 is illegal
Byte count = 0 illegal
Open-ended multiple block
Auto-stop after all bytes transfer
Open-ended multiple block
Auto-stop after all bytes transfer
set
Byte count = 0 is illegal
Byte count = 0 illegal
Open-ended multiple block
Pre-defined multiple block
Open-ended multiple block
Pre-defined multiple block
14-31
Comments
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