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PACE1757M датащи(PDF) 5 Page - Pyramid Semiconductor Corporation

номер детали PACE1757M
подробное описание детали  COMPLETE EMBEDDED CPU SUBSYSTEM
PDF  34 Pages
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производитель  PYRAMID [Pyramid Semiconductor Corporation]
домашняя страница  http://www.pyramidsemiconductor.com
Logo PYRAMID - Pyramid Semiconductor Corporation

PACE1757M датащи(HTML) 5 Page - Pyramid Semiconductor Corporation

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PACE 1757 M/ME
Page 5 of 34
Document # MICRO-10 REV B
TIMING GENERATOR STATE DIAGRAMS
Two separate and almost independent state diagrams
may be used to describe the PACE1757M machine
cycle.
The Execution Unit performs according to a cycle of
three state represented by Diagram A (the A machine)
and the External Bus Unit follows a minimum cycle of
four states, indicated in Diagram B (the B machine).
Referring to Diagram A, the paths are defined as
follows for the Execution Unit:
(0) External Reset true
(1) External Reset false
(2) ALU wait or Bus wait.
(3) ALU Branch false
(4) ALU Branch true
Diagram A
Diagram B
Diagram B defines the paths for the External Bus as
follows:
(0) External Reset false
(8) Bus Req. false
(9) Bus Req. true and Bus Av. true
(10) Bus Req. true and Bus Av. false
(11) Bus Av. false
(12) Bus Av. true
(13) RDYA false
(14) RDYA true
(16) RDYD false
(17) RDYD true and Bus Req. true and Bus Av. true
(18) RDYD true and Bus Req. false
(19) RDYD true and Bus Req. true and Bus Av. false
(20) Bus Req. true and Bus Av. true
NOTE:
Bus AV = Bus grant and Bus not busy and Bus not locked.



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