w83626f Winbond Electronics Corp America, w83626f Datasheet - Page 18

• Manufacturer Part Number: w83626f
• Description: Lpc To Isa Bridge Set
• Manufacturer: Winbond Electronics Corp America

Table 1, continued.
CR43 (Tristate controllable Register (Power-down Mode2), Default 0x07)
The Fast mode is used to improve the performance of transferable interface, because some applications
will do fast transaction. To set the suitable bits to decide on specify range or all ISA cycles will meet the
requested I/O cycles.
Bit 7:
Bit 6:
Bit 5:
Bit 4:
Bit 3:
Bit 2:
Bit 1:
Bit 0:
SET VALUE(HEX)
Reserved.
= 1 Enable Fast mode by ADDRESS DECODER 2 and SYSCLK is depended on
the state of Bit 3 .
= 0 ADDRESS DECORDER 2 doesn’t affect Fast Mode and do original operation.
= 1 Enable Fast mode by ADDRESS DECODER 1 and SYSCLK is depended on
the state of Bit 3.
= 0 ADDRESS DECORDER 1 doesn’t affect Fast Mode and do original operation.
= 1 Enable Fast Mode of whole chip, whole ISA cycle of this bridge will be done
Fast Mode operation and SYSCLK is depended on the state of Bit 3.
= 0 Normal operation, just Bit 6 and Bit 5 can affect Fast Mode operation.
= 1 SYSCLK is equal to PCICLK divided by 1 when decoding range is in Fast Mode.
= 0 SYSCLK is equal to PCICLK divided by 2 when decoding range is in Fast Mode.
= 1 Disabled Memory cycles.
= 0 Normal used.
= 1 Forced 16 bit cycles.
= 0 Normal used.
= 1 8-bit data bus decode only. Only SD [7..0] signals are active.
= 0 Normal used.
1A
1B
.
.
TRI_STATE RANGE
None one
LA[23]
- 18 -
W83626F/W83626D/W83626G
.
.
SA[19..0] and LA[22..17]
SA[19..0] and LA[23..17]
WORKABLE
.
.