W83626F Datasheet, PDF (14/34 Pages) Winbond – LPC-to-ISA Bridge

LPC TO ISA BRIDGE SET
W83626F/W83626D
Bit 7
SYSCLK Divider.
= 0 SYSCLK is equal to PCICLK divided by 4.
= 1 SYSCLK is equal to PCICLK divided by 3.
PRELIMINARY
Bit 6
8-bit I/O Recovery Enable
= 0 Disable bit [5:3] setting and uses 3.5 SYSCLKs for 8 bit I/O recovery time.
= 1 Enable bit [5:3] setting.
Bit 5:3
Bit 2
8-bit I/O Recovery Times .
When bit 6= 1 , these 3 bits field define the additional number of SYSCLKs added
to standard 3.5 SYSCLK recovery time for 8 bit I/O
= 000 0 SYSCLK
= 001 1 SYSCLK
= 010 2 SYSCLKs
= 011 3 SYSCLKs
= 100 4 SYSCLKs
= 101 5 SYSCLKs
= 110 6 SYSCLKs
= 111 7 SYSCLKs
= 0 Ignore bits [1:0] setting and uses 3.5 SYSCLKs for 16-bit I/O recovery
time.
= 1 The 16-bit I/O recovery time is decided by bits 1:0.
Bit 1:0
16-bit I/O Recovery Times.
When bit 2 = 1 , this 2-bit field defines the additional number of SYSCLKs added
to standard 3.5 SYSCLK recovery time for 16 bit I/O
= 01 1 SYSCLK
= 10 2 SYSCLKs
= 11 3 SYSCLKs
= 00 4 SYSCLKs
CR10 (GPIO0-GPIO7 Function Enable Register, Default 0x00)
Bit 7 - 1:
Reserved.
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Publication Release Date: Feb 2000
Revision 0.50