Samsung DVD-909 Service Manual page 15

Reference Information
2-1-5 DIC2 (KM416C254BJ-6 ; CMOS DRAM)
RAS
UCAS
Control
Clocks
LCAS
W
Row Address Buffer
AO
.
.
Col. Address Buffer
A8
NAME
A 0 - A 8
D Q 0 - 1 5
VSS
R A S
UCAS
L C A S
W
O E
V
CC
N . C
2-8
Refresh Timer
Refresh Control
Refresh Counter
Address Inputs
D a t a i n / O u t
Ground
Row Address Strobe
Upper Column Address Strobe
Lower Column Address Strobe
R e a d / W r i t e I n p u t
D a t a O u t p u t E n a b l e
P o w e r ( + 5 V )
P o w e r ( + 3 . 3 V )
No Connection
BLOCK DIAGRAM
VBB Generator
Row Decoder
Memory Array
262,144 x 16
Cells
Column Decoder
FUNCTION
Vcc
Vss
Lower
Data in
Buffer
Lower
Data out
Buffer
Upper
Data in
Buffer
Upper
Data out
Buffer
Samsung Electronics
DQ0
to
DQ7
OE
DQ8
to
DQ15