Oki PACEMARK 4410, Руководство по обслуживанию

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40496501TH Draft Version
16
(5) EEPROM(IC40)
The EEPROM is a CMOS serial I/O type memory which is capable of electrically erasing and
writing 1,024 bits.
The EEPROM contains menu data.
The following shows the memory access operation.
Figure 2.5
NHDC LSI EEPROM
EEPROMWR-P
EEPROMCS-P
EEPROMRD-P
EEPROMCLK-P
DI
CS
DO
SK
,
,
,
,
,
,
,
Ready Bus
twp
D0 D15 A0 A5
1 1
0
Start
code
Operation
code
Address Data
t
CS
PRE = O
PE
Address
Start
code
Operation
code
EEPROMRD-P
EEPROMWR-P
EEPROMCLK-P
EEPROMCS-P
EEPROMRD-P
EEPROMWR-P
EEPROMCLK-P
EEPROMCS-P
D15 D0 D15 D0 D15
0
A0 A5
0
1 1
t
CS
PRE = O
PE = X
Read cycle timing (READ)
Write cycle timing (WRITE)