Samsung DVD-907, Service Manual

Page: 30 / 146

IC Descriptions
6-19 Samsung Electronics
6-9 CMOS DRAM
KM416C254DJ
BIC3, BIC4, BIC5, BIC6, BIC7
N A M E
A 0 - A 8
D Q 0 - 1 5
V S S
R A S
U C A S
L C A S
W
O E
V
C C
N.C
BLOCK DIAGRAM
Control
Clocks
VBB Generator
Lower
Data in
Buffer
DQ0
to
DQ7
OE
DQ8
to
DQ15
Lower
Data out
Buffer
Upper
Data in
Buffer
Upper
Data out
Buffer
Vcc
Vss
RAS
UCAS
LCAS
W
F U N C T I O N
Address Inputs
Data in/Out
Ground
Row Address Strobe
Upper Column Address Strobe
Lower Column Address Strobe
Read/Write Input
Data Output Enable
Power (+5V)
Power (+3.3V)
No Connection
PIN ASSIGNMENT
Refresh Timer
Refresh Control
AO
.
.
A8
Refresh Counter
Row Address Buffer
Col. Address Buffer
Row Decoder
Column Decoder
Memory Array
262,144 x 16
Cells