Oki ML490 Maintenance Manual - Page 12
The RAM is CMOS dynamic RAM with 256K
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(3) RAM The RAM is CMOS dynamic RAM with 256K × 16-bit (4M bit), and used as buffers (such as receiving buffer, printing buffer, DLL buffer and working buffer). The following shows the examples of the memory access operation. MPU A0~A8 RAM P03 CS1 P11 WRL RD RAS-N CAS-N UCAS-N WRH-N ALS139 LCAS-N WRL-N ALS11 WR-N D0~D15 RAS UCAS LCAS WE RD-N OE Clockout* T1 T2 T3 T4 A0~A8 RAS-N VCAS-N LCAS-N RD-N D0~D15 (Read) WR-N D0~D15 (Write) 16-bit bus, Word instruction * Clockout is provided when the original excitation is selected. 42114101 Rev.1 12 /
42114101
Rev.1
12 /
(3)
RAM
The RAM is CMOS dynamic RAM with 256K
×
16-bit (4M bit), and used as buffers (such
as receiving buffer, printing buffer, DLL buffer and working buffer).
The following shows the examples of the memory access operation.
* Clockout is provided when the original excitation is selected.
A0~A8
CAS-N
RAS-N
UCAS-N
LCAS-N
WR-N
RD-N
WRH-N
WRL-N
RAM
MPU
P03
CS1
WRL
P11
RD
OE
D0~D15
RAS
UCAS
LCAS
WE
T1
T2
T3
Clockout*
A0~A8
RAS-N
VCAS-N
LCAS-N
RD-N
D0~D15
(Read)
WR-N
D0~D15
(Write)
16-bit bus, Word instruction
ALS139
ALS11
T4