SDA9253 Datasheet, PDF (15/25 Pages) Siemens Semiconductor Group – 2.6 MBit Dynamic Sequential Access Memory for Television Applications (TV-SAM)

SDA 9253
Operation Truth Table
SCAD
RE Cycle N
SAR
SAC
RA0…RA
7
RA0…RA
7
CA0…CA
5
CA0…CA
5
Mode
M0 M1
L
L
H
L
RE Cycle N + n, n = 1, 2, 3 …
OEA OEB SCA SCB RA RB WT Operation
X
X
X
X
X
X Read transfer from
memory to shifter A
X
X
X
X
X
X Read transfer from
memory to shifter B
RA0…RA CA0…CA L
H
X
X
X
X
X
X
7
5
Write transfer from
shifter C to memory
X
X
X
X
H
H
X
X
X
X
X
X
X Refresh with
internal row address
X
X
X
L
X
X
X
X
X Serial read port A
X
X
X
X
X
X
L
X
X
X
X Serial read port B
X
X
X
X
X
X
X
X
X
X
X Serial read port C
Note: X = Don’t care
Row address, column address and mode bits have to be
V(TF)= 1/2 V_DD1 (TF) or not connected defined in RE cycle N in order to become effective in RE
cycle N + 1
Semiconductor Group
15
1998-01-30