PC87200 PCI to ISA Bridge
PC87200 PCI to ISA Bridge
August 1999
PC87200 PCI to ISA Bridge
1.0 General Description
The PC87200 Enhanced Integrate...
Description
PC87200 PCI to ISA Bridge
August 1999
PC87200 PCI to ISA Bridge
1.0 General Description
The PC87200 Enhanced Integrated PCI-to-ISA bridge works with an LPC chipset to provide ISA slot support. It is a complement to the National Semiconductor PC8736x Super I/O family.
2.2 PCI-to-ISA Bridge
– PCI 2.1 compliant 33 MHz bus – Supports PCI initiator-to-ISA and ISA master-to-PCI cycle translations – Subtractive agent for unclaimed transactions (see the PROHIBIT signal description for exceptions) – Parallel to Serial IRQ conversion including IRQ3,4,5,6,7,9,10,11,12,14,15 – Supports 4 ISA slots directly without buffering – Programmable ISA clock (8.33 to 11 MHz) – Slow slew rate on edges
2.0 Features
2.1 General
– Functionally compatible with Intel 82380AB – 5.0 V tolerant PCI and ISA interfaces – Slave mode serialized IRQ support for both quiet and continuous modes – PC/PCI DMA support – 32-bit address decode for the 1MB BIOS ROM – Supports ISA bus mastering – 160-pin PQFP package
2.3 "PROHIBIT" functional support
– Disables PCI bus subtractive decoding when PROHIBIT is asserted
Block Diagram
PCI Bus
Serialized IRQ Interface PCI to X-Bus / X-Bus to PCI Bridge
PC87200 Support PCI Configuration Registers Decoding logic X-Bus Arbiter
PROHIBIT
BPD#
X-Bus
PCPCIREQ#
Serial IRQ Slave mode interface logic
ISA bus Target Interface
ISA bus Master Interface
PC/PCI DMA Interface
PCPCIGNT#
ISA Bus
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