Sony SCD-XB940 Service Manual page 34

• IC Block Diagrams
– MAIN Board –
IC621 SN74LV74APWR
14 13 12 11 10 9 8
VCC
PR
Q
D
CK
Q
CLR
PR
D Q
CK Q
CLR
GND
1 2 3 4 5 6 7
IC628 MSM54V16258BSL-40TS-K
44 43 42 41 40 39 38 37 36 35 34 – 32
CONTROLLER
OUTPUT INPUT
BUFFER BUFFER
CONTROLLER
OUTPUT INPUT
BUFFER BUFFER
11 – 14
1 2 3 4 5 6 7 8 9 10
34
NC
31 30 29
REFRESH
TIMING
CONTROL
GENERATOR
CLOCK
I/O
I/O
SENSE
AMPLIFIER DECODERS
MEMORY
CELLS DRIVERS
15 16 17
NC
28 27 26 25 24 23
INTERNAL
ADDRESS
COUNTER
ROW
COLUMN
ADDRESS
ADDRESS
BUFFERS
BUFFERS
COLUMN
WORD ROW
DECODERS
18 19 20 21 22