PC87200 Datasheet | National Semiconductor

Description The PC87200 Enhanced Integrated PCI-to-ISA bridge works with an LPC chipset to provide ISA slot support. It is a plement to the National Semiconductor PC8736x Super I/O family. 2.2 PCI-to-ISA Bridge - PCI 2.1 pliant 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 patible 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 TRI-STATE® is a registered trademark of National Semiconductor Corporation. © 1999 National Semiconductor Corporation .national. Table of Contents 1.0 2.0 General...