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SMCXXXBF bảng dữ liệu(PDF) 78 Page - STMicroelectronics |
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SMCXXXBF bảng dữ liệu(HTML) 78 Page - STMicroelectronics |
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78 / 91 page  CF-ATA command description SMCxxxBF 78/91 10.25 Write DMA (CAh) This command uses DMA mode to write from 1 to 256 sectors as specified in the Sector Count register. If the sector count is set to ‘0’, 256 sectors will be read by issuing a Read DMA command. The transfer begins at the sector specified in the Sector Number Register. When the Write DAM command is issued, the CompactFlash Storage Card asserts BSY and transfers all or part of the sector data in the buffer. The Card can then set DRQ and clear BSY, although it is not required. The Card asserts DMARQ when data are available to be transferred. The host then writes the 512*sector-count Bytes of data to the Card using the DMA protocol. When DMARQ is asserted by the Card, the host asserts -DMACK to notify that it is ready to transfer data, and asserts -IOWR once for each 16 bit Word to be transferred. Interrupts are not generated for each sector transfer, but when all sectors have been transferred or when an error occurred during the operation. An Abort error is returned by the Card when a Write DMA command is sent by the host and the 8-bit transfer mode has been enabled by the Set Features command. Table 79 defines the Write DMA command Byte sequence. Table 79. Write DMA Bit 7 6 5 432 1 0 Command (7) CAh C/D/H (6) LBA Drive Head (LBA 27-24) Cyl High (5) Cylinder High (LBA 23-16) Cyl Low (4) Cylinder Low (LBA 15-8) Sect Num (3) Sector Number (LBA 7-0) Sect Cnt (2) Sector Count Feature (1) X |
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