SanDisk SDCFX-256-786 Product Manual - Page 69
Read Buffer-E4H, Read DMA Command-C8H, C9H
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SanDisk CompactFlash Card OEM Product Manual ATA Command Description 5.1.9 Read Buffer-E4H The Read Buffer command enables the host to read the current contents of the card's sector buffer. This command has the same protocol as the Read Sector(s) command. Table 5-16 Read Buffer Bit 7 6 5 4 3 2 1 0 Command (7) E4H C/D/H (6) X Drive X Cyl High (5) X Cyl Low (4) X Sec Num (3) X Sec Cnt (2) X Feature (1) X 5.1.10 Read DMA Command-C8H, C9H The Read DMA command in Table 5-17 executes in a similar manner to the READ SECTOR(S) command except for the following: • The host initializes the DMA channel prior to issuing the command. • Data transfers are qualified by DMARQ and are performed by the DMA channel. • The device issues only one interrupt per command to indicate that data transfer has termi nated and status is available. During the DMA transfer phase of a Read DMA command, the device provides status of the BSY bit or the DRQ bit until the command is completed. Table 5-17 Read DMA Command Bit 7 6 5 4 3 2 1 0 Command (7) C8H or C9H C/D/H (6) 1 LBA 1 Drive Head (LBA 27-24) Cyl High (5) Cyl Low (4) Cylinder High (LBA 23-16) Cylinder Low (LBA 15-8) Sec Num (3) Sector Number (LBA 7-0) Sec Cnt (2) Sector Count Feature (1) X © 2007 SanDisk Corporation 5-15 Rev. 12.0, 02/07