Sharp DX-SX1H Service Manual page 65

IC903 RH-iX2840AFZZ: 16Mbit SDRAM (IX2840AF)
Pin No. Terminal Name
1 VCC
2-5 DQ1-DQ4
6 WE
7 RAS
8* NC
9 A10R
10-13 A0-A3
14 VCC
15 VSS
16-21 A4-A9
22 OE
23 CAS
24-27 DQ5-Q8
28 VSS
In this unit, the terminal with asterisk mark (*) is (open)
terminal which is not connected to the outside.
TIMING
RAS
GENERATOR
CAS
COLUMN •
10
ADDRESS
BUFFER
INTERNAL
A0~A9
ADDRESS
COUNTER
10
ROW
ADDRESS
BUFFER
A10R
1
V
CC
V
SS
Function
Power supply (3.3V)
Data input/output
Write enable
Row address strobe
Not used
Address input
Address input
Power supply (3.3V)
Ground (0V)
Address input
Output enable
Column address strobe
Data input/output
Ground (0V)
WE
10
REFRESH
MASTER CLOCK
11
V
CC
ON CHIP
VCC GENERATOR
V
SS
Figure 65 BLOCK DIAGRAM OF IC
28 pin plastic SOJ
V 1
CC
DQ1 2
DQ2 3
DQ3
4
DQ4
5
WE 6
RAS
7
NC
8
A10R
9
A0
10
A1
11
A2
12
A3
13
V
CC
14
OE
INPUT/OUTPUT
CONTROL UNIT
COLUMN •
DECODER
INPUT/
OUTPUT
8
SENSE AMPLIFIER
SELECTOR
MEMORY
CELL
– 65 –
28 pin plastic TSOP
(Type K)
28 V V 1
SS CC
27 DQ8 DQ1 2
26 DQ7 DQ2 3
DQ6 DQ3
25 4
DQ5 DQ4
24 5
23 CAS WE 6
OE RAS
22 7
A9 NC
21 8
A8 A10R
20 9
A7 A0
19 10
A6 A1
18 11
A5 A2
17 12
A4 A3
16 13
V V
SS CC
15 14
OUTPUT
8 8
BUFFER
INPUT
8
8
BUFFER
8
DX-SX1H
28 V
SS
27 DQ8
26 DQ7
DQ6
25
DQ5
24
23 CAS
OE
22
A9
21
A8
20
A7
19
A6
18
A5
17
A4
16
V
SS
15
DQ1~DQ8