Integrated circuit microprocessor with programmable memory acces

Details Integrated circuit microprocessor with programmable memory acces Integrated circuit microprocessor with programmable memory acces

1994-08-31

1998-03-10

Swann, Tod R.

Excavating

395310, 395490, 395494, 395559, G06F 1110

Patent

active

057270058

ABSTRACT:
An integrated circuit microprocessor (30) accesses external memory using internally-generated control signals having programmable memory access interface types. A register (61), associated with a memory region, stores an encoded value. During an access to that memory region, a decoder (63) decodes the encoded value to provide a decoded signal. If the decoded signal is in a legal state, then an access controller (64) activates external control signals with timing corresponding to the legal state. If the decoded signal is in a reserved state, then the access controller (64) prevents the access from taking place by keeping the external control signals inactive, preventing software errors from resulting in illegal accesses. For one legal memory access type, the early synchronous output enable access type, the access controller (64) activates an output enable signal at a clock transition but doesn't latch the corresponding data until the next transition, allowing efficient accesses to memory devices with slower memory cores.

REFERENCES:
patent: 5067077 (1991-11-01), Wakimoto et al.
patent: 5111423 (1992-05-01), Kopec, Jr. et al.
patent: 5151986 (1992-09-01), Langan et al.
patent: 5335334 (1994-08-01), Takahashi et al.
patent: 5349685 (1994-09-01), Honlberg
patent: 5418924 (1995-05-01), Dresser
patent: 5430747 (1995-07-01), Jibbe et al.
patent: 5452431 (1995-09-01), Bournas
patent: 5522064 (1996-05-01), Aldereguia et al.
IBM Technical Disclosure Bulletin, "Direct Memory Access Protection for IEE 1394 Link Layer Adapters," vol. 37, No. 12, Dec. 1994, pp. 305-308.
IBM Technical Disclosure Bulletin, "Anticipatory Generation of Addresses for Microprocessors," vol. 35, No. 7, Dec. 1992, pp. 394-397.
"MC68332 User's Manual", (System Integration Module), Motorola, Inc., 1990, pp. 4-27 through 4-46.

Affiliated with

Also associated with

Rating

Integrated circuit microprocessor with programmable memory acces does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Integrated circuit microprocessor with programmable memory acces, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Integrated circuit microprocessor with programmable memory acces will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-146095