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SMC032AF Datasheet(PDF) 72 Page - Numonyx B.V |
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SMC032AF Datasheet(HTML) 72 Page - Numonyx B.V |
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72 / 82 page  CF-ATA command description SMCxxxAF 72/82 9.25 Write Multiple without Erase command (CDh) This command is similar to the Write Multiple command with the exception that an implied erase before write operation is not performed. The sectors should be pre-erased with the Erase Sector(s) command before this command is issued. Table 77 defines the Write Multiple without Erase command byte sequence. 9.26 Write Sector(s) command (30h or 31h) This command writes from 1 to 256 sectors as specified in the Sector Count register. A sector count of zero requests 256 sectors. The transfer begins at the sector specified in the Sector Number register. When this command is accepted, the Card sets BSY, sets DRQ and clears BSY, then waits for the host to fill the sector buffer with the data to be written. No interrupt is generated to start the first host transfer operation. No data should be transferred by the host until BSY has been cleared by the host. For multiple sectors, after the first sector of data is in the buffer, BSY will be set and DRQ will be cleared. After the next buffer is ready for data, BSY is cleared, DRQ is set and an interrupt is generated. When the final sector of data is transferred, BSY is set and DRQ is cleared. It will remain in this state until the command is completed at which time BSY is cleared and an interrupt is generated. If an error occurs during a write of more than one sector, writing terminates at the sector where the error occurred. The Command Block registers contain the cylinder, head and sector number of the sector where the error occurred. The host may then read the command block to determine what error has occurred, and on which sector. Table 78 defines the Write Sector(s) command byte sequence. Table 77. Write Multiple without Erase Bit 7 6 5 4 3 2 1 0 Command (7) CDh C/D/H (6) X LBA 1 Driv e Head Cyl High (5) Cylinder High Cyl Low (4) Cylinder Low Sect Num (3) Sector Number Sect Cnt (2) Sector Count Feature (1) X Table 78. Write Sector(s) Bit 7 6 5432 1 0 Command (7) 30h or 31h C/D/H (6) 1 LBA 1 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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