Samsung S5PC100 User Manual page 947

SD/MMC CONTROLLER S5PC100 USER'S MANUAL (REV1.0)
4.11 TRANSACTION CONTROL WITH DATA TRANSFER USING DAT LINE
Depending on whether DMA (optional) is used or not, there are two execution methods. The sequence without
using DMA is shown in Figure 8.12-11 and the sequence using DMA is shown in Figure 8.12-12.
In addition, the sequences for SD transfers are basically classified according to how the number of blocks is
specified. The three kinds of classification are as follows:
1) Single Block Transfer:
The number of blocks is specified to the Host Controller before the transfer. The number of blocks specified is
always one.
2) Multiple Block Transfer:
The number of blocks is specified to the Host Controller before the transfer. The number of blocks specified is one
or more.
3) Infinite Block Transfer:
The number of blocks is not specified to the Host Controller before the transfer. This transfer is continued until an
abort transaction is executed. This abort transaction is performed by CMD12 (Stop Command) in the case of a SD
memory card and by CMD52 (IO_RW_DIRECT) in the case of a SDIO card.
8.12-12