ATA Bus Interface and ATA Commands
Quantum Fireball Plus AS 10.2/20.5/30.0/40.0/60.0 GB AT 6-81
SET MAX ADDRESS
SET MAX ADDRESSSET MAX ADDRESS
SET MAX ADDRESS
Inputs
Features - will be equal to 00h.
Sector Count - VV (Value Volatile). If bit 0 is set to one, the device will preserve
the maximum values over power-up or hardware reset. If bit 0 is cleared to zero, the
device will revert to the most recent non-volatile maximum address value setting
over power-up or hardware reset.
Sector Number - contains the native maximum address sector number (IDENTIFY
DEVICE word 6) or LBA bits (7:0) value to be set.
Cylinder Low - contains the maximum cylinder low or LBA bits (15:8) value to be
set.
Cylinder High - contains the maximum cylinder or LBA bits (23:16) value to be set.
Device/Head - If LBA is set to one the maximum address value is an LBA value.
If LBA is cleared to zero, the maximum address value is a CHS value.
DEV will indicate the selected device.
Bits (3:0) contain the native maximum address head number (IDENTIFY
DEVICE word 3 minus one) or LBA bits (27:24) value to be set.
Normal Outputs
Normal OutputsNormal Outputs
Normal Outputs
Sector Number - Maximum native sector number or LBA bits (7:0) set on the
device.
Cylinder Low - Maximum cylinder number low or LBA bits (15:8) set on the device.
Register
RegisterRegister
Register 7
77
76
66
65
55
54
44
43
33
32
22
21
11
10
00
0
Features 00h
Sector Count na VV
Sector Number Native max address sector number or set max LBA
Cylinder Low Set max cylinder low or LBA
Cylinder High Set max cylinder high or LBA
Device/Head obs LBA obs DEV Native max address head number or
set max LBA
Command F9h
Register
RegisterRegister
Register 7
77
76
66
65
55
54
44
43
33
32
22
21
11
10
00
0
Error na
Sector Count na
Sector Number Native max sector number or max LBA
Cylinder Low Max cylinder low or LBA
Cylinder High Max cylinder high or LBA
Device/Head obs na obs DEV Native max head or max LBA
Status BSY DRDY DF na DRQ na na ERR
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