msm548263 Oki Semiconductor, msm548263 Datasheet - Page 30

• Manufacturer Part Number: msm548263
• Description: Msm548263256k X 8 Multiport Dram
• Manufacturer: Oki Semiconductor

¡ Semiconductor
OPERATION MODES
Table-1 shows the function truth table for a listing of all available RAM ports and transter
operation of MSM548263.
The RAM port and data transfer operations are determined by the state of CAS, TRG, WE and
DSF at the falling edge of RAS, and by the level of DSF at the falling edge of CAS.
Notes:
MSWT
Code
CBRR
CBRS
CBRN
RWM
BWM
MWT
FWM
LMR
ROR
SRT
LCR
RW
BW
RT
CAS TRG WE DSF DSF
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1. With CBRS and SAM operations use stop register
2. After LMR, RWM, BWM, FWM and MSWT, use old mask which can be reset by
RASØ
*
*
*
1
0
0
0
0
1
1
1
1
1
1
1
CBRR.
1
0
1
*
0
0
1
1
0
0
0
1
1
1
1
0
1
1
0
0
1
0
1
0
0
1
0
0
1
1
CASØ
—
—
—
— Row
*
*
*
*
0
1
*
0
1
0
1
RASØ
STOP
Row TAP WM1
Row TAP WM1
Row TAP
Row TAP
Row
Row
Row
Row
Row
Row
Row
Address
Table-1. Function Truth Table
*
*
A2c - 8c
A2c - 8c
CASØ
Column
Column
Column
Column
—
*
*
*
*
*
*
RASØ
WM1
WM1
WM1 —
*
*
*
*
*
*
*
*
*
*
W/IO
Din, Dout
Din, Dout
Column
Column
/WEØ
Select
Select
Mask
Color
CAS
Data
Data
—
*
*
*
*
*
*
*
Mask W.M.
Write Pers.
Yes
Yes
Yes
Yes
Yes
No
No
—
—
—
—
—
—
—
—
Reset Reset
Yes
Yes
Yes
Yes
Yes
No/ Load
No/
No/
No/
No/
Set Load —
No
No
—
—
—
—
—
—
Load
Load
Load
Load
WM
Register
Use
Use
Use
Use
Use
—
—
—
—
—
—
—
— Load
Color
Use
Use
Use
—
—
—
—
—
—
—
—
—
—
CBR Refresh
(Register Reset)
CBR Refresh
(Stop Register Set)
CBR Refresh (No Reset)
RAS Only Refresh
Masked Write Transfer
Masked Split
Write Transfer
Read Transfer
Split Read Transfer
Read/Write
(New/Old Mask)
Masked Block Write
(New/Old)
Masked Flash Write
(New/Old)
Read/Write
(No Mask)
Block Write
(No Mask)
Load Mask Register
(Old Mask Set)
Load Color Register
Function
MSM548263
30/40