Apparatus and method for read-accessing write-only registers in

Details Apparatus and method for read-accessing write-only registers in Apparatus and method for read-accessing write-only registers in

1996-08-09

1999-04-06

An, Meng-Ai T.

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

711154, G06F 1310

Patent

active

058929770

ABSTRACT:
A computer system has an I/O address space with an ISA bus, and a configuration address space with a PCI bus, further the system including an ISA DMA (Direct Memory Access) controller with two or more DMA channels on the ISA bus, an I/O register implemented in the DMA controller for storing information for DMA transfer on each of the DMA channels, and a register control logic device for controlling read/write-access to the I/O register. The I/O registers are allocated to the I/O address space, and further write-only registers in the I/O registers are allocated to the configuration address space. When a HOST-PCI bridge device generates a configuration read cycle through the configuration address space on the PCI bus, the register control logic device read-accesses the write-only registers, in response to the generated configuration read cycle.

REFERENCES:
patent: 5269015 (1993-12-01), Shires
patent: 5434979 (1995-07-01), Warner
patent: 5574869 (1996-11-01), Young et al.
patent: 5666556 (1997-09-01), Khandekar et al.
patent: 5748922 (1998-05-01), Smith et al.
PCI Local Bus Specification, PCI Special Interest Group, Revision 2.1, Jun. 1, 1995.
"82C37A-5 CHMOS High Performance Programmable DMA Controller," Intel: Peripheral Components, 1993, pp. 3-33 to 3-50.
Mobile PC/PCI DMA Arbitration and Protocols: MHPG Architecture Functional Architecture Specification, Intel Corporation, Revision 2.2, Apr. 22, 1996 .

Affiliated with

Also associated with

Rating

Apparatus and method for read-accessing write-only registers in does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus and method for read-accessing write-only registers in , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for read-accessing write-only registers in will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1380420