IT8888F/G中文资料IT8888F/G PCI to ISA Bridge Chip数据手册ITE规格书

描述 Description

The IT8888F/G is a PCI to ISA bridge single function device. The IT8888F/Gserves as a bridge between the PCI bus and ISA bus. The IT8888F/G’s 32-bit PCIbus interface is compliant with PCI Specification V2.1 and supports both PCI BusMaster & Slave. The PCI interface supports both programmable positive and fullsubtractive decoding schemes.The IT8888F/G also integrates two enhanced DMA Slave controllers for achievingPCI DMA cycles: PC/PCI DMASlave Controller & Distributed DMA Slave Controllers.The device also contains one SM bus (single master mode) which can be connectedto a Serial E2PROM for automatic power-on configuration. ITE’s proprietary (USA& Taiwan patent pending) power-on auto-configuration through SM bus can providecustomer with maximum design flexibility. The IT8888F/G also implements theoptional fast positive decode of F, E, D, C memory segments. This specialfeature can provide a direct connection to an FALSH boot ROM.The NOGO function, which is also implemented in the IT8888F/G for enabling ordisabling subtractive decode of PCI interface could be a software controlledoutput pin from other host controlled devices. The Serial IRQ is alsoimplemented in the device for sending and receiving ISA IRQs & IOCHCK#. Thedevice includes an ISA interface which supports full ISA compatible functions.The IT8888G is available in 160-ball TFBGA package.The IT8888F is available in 160-pin PQFP package.

特性 Features

• PCI Interface
Programmable PCI Address Decoders
PC/PCI DMA Controller
Distributed DMA Controller
ISA Interface
SM Bus
1 analog line-level mono output: MONO_OUT
Power-on Serial Bus Configuration
Serial IRQ
Optional FLASH ROM Interface
Versatile power-on strapping options
Supports NOGO function
Single 33 MHz Clock Input
+3.3V PCI I/F with +5V tolerant I/O buffers
+5V ISA I/F and core Power Supply
Package: 160-ball TFBGA or 160-pin QFP