PCI TO ISA BRIDGE SET
Description
PCI TO ISA BRIDGE SET W83628F & W83629D
PRELIMINARY
GENERAL DESCRIPTION W83628F is a PCI-to-ISA bus conversion IC.
W83629D is a condensed centralizer IC for IRQ and DMA control.
W83628F and W83629D together form a complete set for the PCI-to-ISA bridge.
For the new generation Intel chipset Camino and Whitney, featuring LPC bus, there is no support for ISA bus and slots.
However the demand of ISA devices still exist.
For such case, W83628F plus W83629D are the best companion solution for the non-ISA chipset.
Also the packages of W83628F (128-QFP) and W83629D (48LQFP) had been chosen to be the most economic solution for save the M/B board layout size and cost.
For the new generation chipset featuring LPC interface and support no ISA bus, W83627HF/F (Winbond LPC I/O) together with the set of W83628F and W83629D is the complete solution.
FEATURES
PCI to ISA Bridge
• • • • • • • • •
Full ISA Bus Support including ISA Masters 5V ISA and 3.
3V PCI interfaces PC/PCI DMA protocol for Software Transparent IRQ Serializer for ISA Parallel IRQ transfer to Serial IRQ Supports 3 fully ISA Compatible Slots without Buffering PCI Bus at 25MHz, 33MHz and up to 40MHz Supports Programmable ISA Bus Divide the PCI Bus Clock into 3 or 4 All ISA Signals can be Isolate Supports Configuration registers for programming performance
PACKAGE • 128-pin PQFP for W83628F • 48-pin LQFP for W83629D
-1-
Publication Release Date: Dec 1998 Revision 0.
32
PCI TO ISA BRIDGE SET W83628F & W83629D
PRELIMINARY BLOCK DIAGRAM OF W83628F
AD[31:0] C/BE[3:0]# PAR FRAME# TRDY# IRDY# STOP# DEVSEL# IDSEL SERR# NOGO PCIRST# PCICLK
PCI Interface ISA Interface
ISOLATE#
Signal Isolation Control
SA[19:0] SD[15:0] BALE AEN IOCHRDY IOCS16# IOCHK# IOR# IOW# LA[23:17] SBHE# MEMCS16# MEMR# MEMW# SMEMR# SMEMW# ZEROWS# MASTER# REFRESH# ROMCS# RSTDRV SYSCLK HS[2:0]
3.
3V 5V
Power SuppIy Handshaking
-2-
Publication Release Date: Jan 1999 Revision 0.
32
PCI TO ISA BRIDGE SET W83628F & W83629D
PRELIMINARY BLOCK DIAGRA...
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