40496501TH Draft Version
13
(2)
PG ROM (IC46)
This is a 256 x16 bits (4M bit) EPROM with the control program for the printer stored. The MPU
executes instructions under this program.
The program ROM is assigned to the program memory area of the MPU and is fetched by the
RD signal of the MPU.
The following shows the operation of the memory access.
Figure 2.2
MPU CLOCK
ALE
A16~BHE
AD0~AD15
RD
CS
AD0~AD15
A16~BHE
MPU
Main LSI
CG ROM
NHDC LSI
A16-BHE
A0–A15
D0–D15
ALE
RD
WR
CS
CLK
BANK0
BANKS
CS
A17
A16
A0~A15
OE
CE
A1~A16
Содержание PACEMARK 4410
Страница 1: ...PACEMARK 4410 PRINTER SERVICE HANDBOOK...
Страница 52: ...40496501TH Draft Version 52 Figure 3 1 3 2 Parts Layout...
Страница 95: ...40496501TH Draft Version 95...
Страница 151: ...40496501TH Draft Version 151 No Yes End Replace PHA Board Recovered No Yes End Replace PMA Board...
Страница 168: ...XXXXXXXXTH Draft Version 8 5 Fig 8 5 45 38 38 40 42 39 44 44 122 41...
Страница 169: ...XXXXXXXXTH Draft Version 8 6 142 141 11 119 Fig 8 6...
Страница 170: ...XXXXXXXXTH Draft Version 8 7 Fig 8 7 105 102 61 33 104 100 101...
Страница 171: ...XXXXXXXXTH Draft Version 8 8 Fig 8 8 55...