Method and apparatus for controlling a command cycle on a bus

Details Method and apparatus for controlling a command cycle on a bus Method and apparatus for controlling a command cycle on a bus

1996-08-29

1998-11-17

Ray, Gopal C.

395856, 395309, 395281, G06F 1300, G06F 1314

Patent

active

058389300

ABSTRACT:
An EIBB (external ISA bus bridge) in a DS-PCI/ISA bridge device has a circuit for executing conventional command cycles to access an I/O device on an external ISA bus, and a circuit for executing enhanced command cycles to access an Enhanced IDE device on the external ISA bus. The enhanced command cycles are executed at higher speeds than the conventional command cycles. When an ISA DMAC read/write accesses the enhanced IDE device on the external ISA bus, the EIBB asserts address latch enable (BALE) and address enable (AEN) signals so that the operation mode on the external ISA bus is switched from conventional command cycles to enhanced command cycles. After the read/write access to the enhanced IDE device is completed, the EIBB deasserts the BALE and AEN signals so that the operation mode of the external ISA bus switches to the conventional command cycles.

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