Cypress specifications CY7C68300C/CY7C68301C, CY7C68320C/CY7C68321C, 5-12

		CY7C68300C/CY7C68301C
		CY7C68320C/CY7C68321C
Table 6. ATACB Field Descriptions (continued)
Byte	Field Name	Field Description
3	bmATACBRegisterSelect	This field controls which of the taskfile register read or write accesses occur.
		Taskfile read data is always 8 bytes in length, and unselected register data are
		returned as 0x00. Register accesses occur in sequential order as outlined
		below (0 to 7):
		Bit 0 (0x3F6) Device Control/Alternate Status
		Bit 1 (0x1F1) Features/Error
		Bit 2 (0x1F2) Sector Count
		Bit 3 (0x1F3) Sector Number
		Bit 4 (0x1F4) Cylinder Low
		Bit 5 (0x1F5) Cylinder High
		Bit 6 (0x1F6) Device/Head
		Bit 7 (0x1F7) Command/Status
4	bATACBTransferBlockCount	This value indicates the maximum requested block size be in 512-byte incre-
		ments. This value must be set to the last value used for the ’Sectors per block’
		in the SET_MULTIPLE_MODE command. Legal values are 0, 1, 2, 4, 8, 16,
		32, 64, and 128 where 0 indicates 256 sectors per block. A command failed
		status is returned if an illegal value is used in the ATACB.
5–12	bATACBTaskFileWriteData	These bytes contain ATA register data used with ATA command or PIO write
		operations. Only registers selected in bmATACBRegisterSelect are required to
		hold valid data when accessed. The registers are as follows.
		ATACB Address Offset 0x05 (0x3F6) – Device Control
		ATACB Address Offset 0x06 (0x1F1) – Features
		ATACB Address Offset 0x07 (0x1F2) – Sector Count
		ATACB Address Offset 0x08 (0x1F3) – Sector Number
		ATACB Address Offset 0x09 (0x1F4) – Cylinder Low
		ATACB Address Offset 0x0A (0x1F5) – Cylinder High
		ATACB Address Offset 0x0B (0x1F6) – Device
		ATACB Address Offset 0x0C (0x1F7) – Command
13–15	Reserved	These bytes must be set to 0x00 for ATACB commands.

Document 001-05809 Rev. *A Page 17 of 42

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