w83629d Winbond Electronics Corp America, w83629d Datasheet - Page 23

• Manufacturer Part Number: w83629d
• Description: Pci To Isa Bridge Set
• Manufacturer: Winbond Electronics Corp America

8.30 WISA_CTRLREG4-ISA BRIDGE CONTROL REGISTER 4
Address Offset:
Default Value:
Attribute:
Bit7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
8.31 WISA_TSTREG-ISA BRIDGE TEST REGISTER
Address Offset:
Default Value:
Attribute:
Bit 7-5
Bit 4
Bit 3
Bit 2-0
This Bit must be set 1when LPC I/F is only decoding on positive cycles,but
when the bridge is used in PIIX4 for test set the bit to 0 .
=1 Disable DRQ 7.
=0 Enable DRQ5.
=0 Enable DRQ 2.
=0 Enable DRQ 1.
=1 Disable DRQ 1.
=0 Enable DRQ 7.
=0 Enable DRQ6.
=1 Disable DRQ6.
=1 Disable DRQ5.
Reserved.
=0 Enable DRQ 3.
=1 Disable DRQ 3.
=1 Disable DRQ 2.
=0 Enable DRQ 0.
=1 Disable DRQ 0.
=0 80h port decoding on subtrastive cycles of LPC I/F.
=1 80h port decoding on positive cycles of LPC I/F.
000
001
010
011
100
101
110
111
73h
00h
Read/Write
80h
04h
Read/Write
Reserved and should not write data to this register.
Reserved and should not write data to this register.
- 0.8 nS.
- 0.6 nS.
- 0.4 nS.
- 0.2 nS.
+0.2 nS.
+0.4 nS.
+0.6 nS.
0
nS.
For Winbond Internal Reference only.
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W83628F & W83629D
Publication Release Date: May 18, 2005
Revision A1