MSM514262-10JS View Datasheet(PDF) - Oki Electric Industry
Part Name
Description
MFG CO.
'MSM514262-10JS' PDF : 45 Pages View PDF
¡ Semiconductor
MSM514262
OPERATION MODES
Table-1 shows the function truth table for a listing of all available RAM ports and transfer
operation of MSM514262.
The RAM port and data transfer operations are determined by the state of CAS, DT/OE, WB/
WE, SE and DSF at the falling edge of RAS and by the level of DSF at the falling edge of CAS.
Table-1. Function Truth Table
RASØ
CASØ ADDRESS
W/IO
Write Register
CAS DT/OE WB/WE DSF SE DSF RASØ CASØ RASØ CASØ CAS/WEØ Mask WM Color
Function
0*
* * * — * — * — — — — — C.B.R Refresh
10
0 0 0 * Row TAP WM1 *
Load
* WM1
— Masked Write Transfer
Use
10
0 0 1 * Row TAP * *
* — — — Pseudo Write Transfer
10
0 1 * * Row TAP WM1 —
Load
* WM1
— Split Write Transfer
Use
10
1 0 * * Row TAP * *
* — — — Read Transfer
10
1 1 * * Row TAP * *
* — — — Split Read Transfer
11
Load
0 0 * 0 Row Column WM1 — Din WM1
— Write per Bit
Use
11
Column Column
Load
0 0 * 1 Row
WM1
— WM1
Use Masked Block Write
A2c-8c
Select
Use
11
0 1 * * Row * WM1 —
Load
* WM1
Use Masked Flash Write
Use
11
1 0 * 0 Row Column * — Din — — — Read Write
11
Column Column
1 0 * 1 Row
*
— — — Use Block Write
A2c-8c
Select
11
1 1 * * Row * * — Color — — Load Load Color Register
If the DSF is 'high" at the falling edge of RAS, special functions such as split transfer, flash write,
and load/read color register can be invoked. If the DSF is "low" at the falling edge of RAS and
"high" at the falling edge of CAS, the block write feature can be invoked.
If the DSF is "low" at the falling edge of RAS and CAS, only the conventional multiport DRAM
operating feature can be invoked.
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