Logic support chip for AT-type computer with improved bus archit

Details Logic support chip for AT-type computer with improved bus archit Logic support chip for AT-type computer with improved bus archit

1989-11-13

1992-06-23

Fleming, Michael R.

Boots, shoes, and leggings

395250, 364239, 364246, 36424611, G06F 1206, G06F 1336, G06F 1506

Patent

active

051250802

ABSTRACT:
A support chip includes substantially all the AT core logic, namely most of the X-bus peripherals (except for the keyboard controller), memory controllers, and swapper. The normal AT data paths are altered to reduce the pin count, with a resulting surprising improvement in capability. The chip interfaces to the microprocessor's local address and data buses and provides a 16-bit data bus corresponding to a 16-bit version of the X-bus data portion (XD-bus). External buffers coupled to the XD-bus provide a system data bus (SD-bus) corresponding to the S-bus data portion. The I/O channel is coupled to the SD-bus while system ROM is coupled to the XD-bus. To accommodate the fact that the swapper is internal, the support chip provides independent direction control of the high and low order buffers between the XD-bus and the SD-bus.

REFERENCES:
patent: 4425615 (1984-06-01), Swenson et al.
patent: 4470113 (1984-09-01), Oura
patent: 4727509 (1988-02-01), Johnson et al.
patent: 4811203 (1989-03-01), Hamstra
patent: 4920477 (1990-04-01), Colwell et al.

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