Hitachi DK23DA-20F - Page 94

K6602705
Rev.3
08.20.01
- 94 -
Table 6.19 Device Configuration Set Command Data Structure (Continued)
Word Description
255
Integrity word
bit 15 - 8 Checksum
The checksum shall be the two’s complement of the sum of all byte in words 0
through 254 and the byte consisting of bits 7:0 of word 255. Each byte shall be
added with unsigned arithmetic, and overflow shall be ignored. The sum of all
bytes is zero when the checksum is correct
bit 7 - 0 Signature Code
Bits 7:0 of this word shall contain the value A5h.
Error Outputs:
If DEVICE CONFIGURATION FREEZE LOCK is set or If any of the bit modification restrictions described
are violated, the device returns command aborted.
Registers 76543210
Cylinder High Word Location Number
Cylinder Low Bit Location Number bit15 - 8
Device/Head - X - DRV XX
Sector Number Bit Location Number bit 7 - 0
Sector Count XX (Vendor Unique)
Sector Count Register:
This register contains vendor unique value by the device.
Cylinder Low Register, Sector Number:
If the command was aborted because an attempt was made to modify a mode or feature that cannot
be modified with the device in its current state, these registers contain bits (15:0) set in the bit
positions that correspond to the bits in the device configuration overlay data structure words 1, 2, or 7
for each mode or feature that cannot be changed. If not, the value is 00h.
Cylinder High Register:
If the command was aborted because an attempt was made to modify a bit that cannot be modified
with the device in its current state, this register contains the offset of the word that cannot be changed.
If not, the value is 00h.