IT8888 Series

ITE IT8888 Series PCI-to-ISA Bridge Chips

The IT8888G is a PCI to ISA bridge single function device. The IT8888G serves as a bridge between the PCI bus and ISA bus. The IT8888G’s 32-bit PCI bus interface is compliant with PCI Specification V2.1 and supports both PCI Bus Master & Slave. The PCI interface supports both programmable positive and full subtractive decoding schemes.

The IT8888G also integrates two enhanced DMA Slave controllers for achieving PCI DMA cycles: PC/PCI DMA Slave Controller & Distributed DMA Slave Controllers.

The IT8888G also implements the optional fast positive decode of F, E, D, C memory segments. This special feature can provide a direct connection to an FALSH boot ROM.

The NOGO function, which is also implemented in the IT8888G for enabling or disabling subtractive decode of PCI interface, could be a software controlled output pin from other host controlled devices. The Serial IRQ is also implemented in the device for sending and receiving ISA IRQs & IOCHCK#. The device includes an ISA interface which supports full ISA compatible functions.

The IT8888G is available in 160-pin TFBGA package.

- PCI Specification V. 2.1 compliant

- Supports 32-bit PCI bus & up to 33 MHz PCI bus frequency

- Supports PERR# & SERR# Error Reporting

- Supports Delayed Transaction

- Optional CLKRUN# interface support

- Supports either programmable positive decode or full subtractive decode of PCI cycles

- Provides 6 positively decoded I/O blocks & 4 positively decoded memory blocks.

- Optional support ROMCS# fast positive decoder

- Comply with Intel Mobile PC/PCI DMA R2.2

- Supports PPDREQ# and PPDGNT#

- Provides software transparent capability

- Comply with Distributed DMA R6.0

- Supports 7 DDMA channels

- Optional DDMA-Concurrent PCI bus

- Supports full ISA compatible functions

- Supports ISA at ¼ of PCI frequency

- ISA Bus Master supported

- Supports 4 ISA slots

- Comply with System Management Bus Specification R. 1.0

- Supports single master mode

- Interface to Serial E2PROM

- Comply with Serialized IRQ Support for PCI system R6.0

- Supports both continuous and quite modes

- Auto detect Start Frame width and slot number

- Encodes all ISA IRQs and IOCHCK#

- Supports up to 1 Mbytes ROM size

- Positively fast decodes F-segments by power-on strapping