United States Patent [19] [11] Patent Number: 4,500,961
Engles [45] Date of Patent: Feb. 19, 1985
[54] PAGE MODE MEMORY SYSTEM
[75] Inventor: Bruce E. Engles, Austin, Tex.
[73] Assignee: Motorola, Inc., Schaumburg, III.
[21] Appl. No.: 500,705
[22] Filed: Jun. 3, 1983
[51] Int. CI.' G06F9/30
[52] U.S. CI 364/200
[58] Field of Search 364/200 MS File
[56] References Cited
U.S. PATENT DOCUMENTS
3.737.860 6/1973 Sporer 364/200
4.037,214 7/1977 Birney et al 364/200
4,118.773 10/1978 Raguin el al 364/200
4,158.227 6/1979 Baxter et al 364/200
4,240,142 12/1980 Blahut et al 364/200
4.374,417 2/1983 Bradley et al 364/200
Primary Examiner—Thomas M. Heckler
Attorney, Agent, or Firm—Anthony J. Sarli, Jr.; Jeffrey
Van Myers; James L. Clingan, Jr.
[57] ABSTRACT
A multi-page ROM uses programmable pointers for selection of a page. The pointers each have a preliminary latch circuit, an output latch circuit, and a delay circuit. The preliminary latch circuit receives and stores program address signals when a first signal is present. The output latch receives the address stored in the preliminary latch when a second signal is present. The delay circuit removes the first signal before the second signal is present and delays the presence of the first signal for a delay period following the removal of the second signal.
8 Claims, 4 Drawing Figures
