Western Digital Blue WD20SPZX Technical Reference Manual page 50

WORD FIELD DESCRIPTION
Hardware reset result
Bit 15: Shall be cleared to zero.
Bit 14: Shall be set to one for PATA
devices.
Bit 13: 1 = device detected the CBLID-
above ViHB (see ATA8-APT)
0 = device detected the
CBLID- below ViL (see ATA8-APT)
Bit 12:8 Device 1 hardware reset
result. Device 0 shall clear these bits
to zero.
Device 1 shall set these bits
as follows:
12 Reserved
11 Device 1 asserted PDIAG-.
10:9 These bits indicate how
Device 1 determined the device num-
ber:
00 = Reserved
01 = a jumper was used.
10 = the CSEL signal was
used.
11 = some other method
was used or the method is unknown.
93
8 Shall be set to one.
Bit 7:0 Device 0 hardware reset
result. Device 1 shall clear these bits
to zero.
Device 0 shall set these bits as
follows:
7 Reserved
6 Device 0 responds when
Device 1 is selected.
5 Device 0 detected the
assertion of DASP-.
4 Device 0 detected the
assertion of PDIAG-.
3 Device 0 passed diagnos-
tics.
Bit 2:1 These bits indicate how
Device 0 determined the device
number:
00 = Reserved
01 = a jumper was used.
10 = the CSEL signal was used.
11 = some other method was
used or the method is unknown.
Bit 0 Shall be set to one for PATA
devices.
94 Obsolete
95 Stream Minimum Request Size
96 Stream Transfer Time - DMA
97 Stream Access Latency -DMA and PIO
Stream Performance Granularity
98-99
(Dword)
Number of User Addressable Logical
100-103
Sectors (QWord)
104 Streaming Transfer Time - PIO
Maximum number of 512 byte blocks
105
per Data Set Management command
WESTERN DIGITAL CONFIDENTIAL
ATA Command Set
F=fixed
V=variable
X= not defined
- 50 -
Drive Program
Power-on Default Value
F
F
V
V
V
0000h
F
F
V
V
V
V
F
X 0000h
F 0000h
V 0000h
V 0000h
F 0000h
V 88B0E8E000000000h
V 0000h
V 000Ah