System for offloading external bus by coupling peripheral device

Details System for offloading external bus by coupling peripheral device System for offloading external bus by coupling peripheral device

1994-02-14

1998-05-26

Meky, Moustafa M.

395880, 395882, G06F 1328

Patent

active

057581070

ABSTRACT:
A data processing system (30) such as a personal computer expansion board includes a peripheral device (33) designed to interface to a system bus (21). The peripheral device (33) need not be connected directly to the system bus (21). Instead, a data processor (32) connects to the system bus through one interface circuit (37). This interface circuit (37) adapts different timing characteristics of the data processor's signals to those of the system bus (21). The data processor (32) then accesses the peripheral device (33) through a second interface circuit (34), which adapts the timing characteristics of the data processor's signals to those of the peripheral device (33). Thus, the peripheral device (33), which may have a large existing base of software programs, may be programmed locally, without loading the system bus (21). In one embodiment, an access controller (38) extends an access cycle following an access to the peripheral device (33), to prevent contention of data seen by the data processor (32) during a subsequent access.

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