Microprocessor for selecting data bus terminal width regardless

Details Microprocessor for selecting data bus terminal width regardless Microprocessor for selecting data bus terminal width regardless

1995-06-07

1996-08-20

Barry, Lance Leonard

Boots, shoes, and leggings

395800, 395886, 364DIG1, 3642328, 3642329, 3642403, G06F 1576

Patent

active

055487661

ABSTRACT:
A bus cycle control unit of a microprocessor includes a sizing register for latching designation of a 16-bit data bus, and a bus cycle detector for detecting necessity of an additional bus cycle on the basis of the condition of the bus cycle. A command decoder, coupled to the sizing register and the bus cycle decoder, selectively drives bus enable terminals of the bus cycle control unit, and generates various control signals, so that data is transferred through either both the MSB (most significant bits) 16 bits and the (least significant bits) LSB 16 bits of a 32-bit data bus terminal, or only the LSB 16 bits of the 32-bit data bus terminal. Thus, the microprocessor can be freely coupled to a data bus of a fixed 32-bit width, a data bus of a fixed 16-bit width, or a data bus having its data width which can be switched between 32 bits and 16 bits.

REFERENCES:
patent: 4447878 (1984-05-01), Kinnie et al.
patent: 4514808 (1985-04-01), Murayama et al.
patent: 4600988 (1986-07-01), Tendulkar et al.
patent: 4633437 (1986-12-01), Mothersole et al.
patent: 5014186 (1991-05-01), Chisholm
patent: 5034879 (1991-07-01), Woodward et al.
patent: 5109332 (1992-04-01), Culley
patent: 5278968 (1994-01-01), Koumoto
patent: 5300811 (1994-04-01), Suzuki et al.
patent: 5341481 (1994-08-01), Tsukamoto
patent: 5499363 (1996-03-01), Kaneko
NEC Electronics Inc., 16-Bit V-Series Microprocessor Data Book, 3a, pp. 1-11, 32, 3b, pp. 1-7, 10-11 (1990).
Intel Corp., 486 Microprocessor, pp. 2-17, 84-125 (1989).
Motorola, MC68020 32-Bit Microprocessor User's Manual, pp. 5-1 to 5-9 (2d ed 1984).
Motorola, MC68030 Enhanced 32-Bit Microprocessor User's Manual, pp. 1-1 to 1-7, 7-5 to 7-21 (2d ed 1989).

Affiliated with

Also associated with

Rating

Microprocessor for selecting data bus terminal width regardless does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Microprocessor for selecting data bus terminal width regardless , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microprocessor for selecting data bus terminal width regardless will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2337987