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SMC032AF Datasheet(PDF) 65 Page - Numonyx B.V |
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SMC032AF Datasheet(HTML) 65 Page - Numonyx B.V |
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65 / 82 page  SMCxxxAF CF-ATA command description 65/82 9.15 Seek command (7Xh) This command is effectively a NOP command to the card although it does perform a range check of cylinder and head or LBA address and returns an error if the address is out of range. Table 64 shows the Seek command byte sequence. 9.16 Set Features command (EFh) This command is used by the host to establish or select certain features. Table 65 shows the Set Features command byte sequence. Table 66 defines all features that are supported. Features 01h and 81h are used to enable and clear 8 bit data transfer modes in True IDE mode. If the 01h Feature command is issued all data transfers will occur on the low order D7D0 data bus and the –IOIS16 signal will not be asserted for data register accesses. Feature 03h allows the host to select the PIO transfer mode by specifying a value in the Sector Count register (see Table 67 for values). The upper 5 bits define the type of transfer and the low order 3 bits encode the mode value. One PIO mode should be selected at all times. The host may change the selected mode by issuing the Set Features command. Feature code 9Ah enables the host to configure the card to best meet the host system's power requirements. The host sets a value in the Sector Count register that is equal to one- fourth of the desired maximum average current (in mA) that the card should consume. For example, if the Sector Count register were set to 6, the card would be configured to provide the best possible performance without exceeding 24 mA. Upon completion of the command, the card responds to the host with the range of values supported by the card. The minimum value is set in the Cylinder Low register, and the maximum value is set in the Cylinder Hi register. The default value, after a power on reset, is to operate at the highest performance and therefore the highest current mode. The card will accept values outside this programmable range, but will operate at either the lowest power or highest performance as appropriate. Table 64. Seek Bit 7 6 5 4 3210 Command (7) 7Xh 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) X (LBA 7-0) Sect Cnt (2) X Feature (1) X |
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