Sam4s ER-390 Series Service Manual page 31

Electronic cash register
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6-1 Semiconductor Base Diagram
6-1-2 Memory
PIN DESCRIPTION
NC
1
32
A16
2
31
A14
3
30
A12
4
29
A7
5
28
32-SOP
6
27
A6
A5
7
26
32-DIP
25
A4
8
24
A3
9
23
A2
10
22
A1
11
21
A0
12
20
I/O1
13
19
I/O2
14
18
I/O3
15
17
VSS
16
Name
CS
, CS
1
2
OE
WE
I/O
~I/O
1
8
A
~A
0
16
Vcc
Vss
NC
PIN DESCRIPTION
A18
1
32
A16
2
31
A14
A17
3
30
A12
4
29
A7
5
28
A6
6
27
32-DIP
A5
26
7
32-SOP
A4
8
25
32-TSOP2
A3
24
9
(Forward)
A2
10
23
A1
11
22
A0
21
12
I/O1
20
13
I/O2
19
14
I/O3
18
15
VSS
17
16
Pin Name
WE
CS
OE
A
~A
0
18
I/O
~I/O
1
8
Vcc
Vss
SAM4S ER-390 SERIES
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A11
1
32
A9
2
31
A8
3
30
A13
4
29
WE
5
28
VCC
CS2
6
27
A15
A15
7
32-TSOP
26
VCC
8
25
CS2
NC
9
Type1-Forward
24
A16
10
23
WE
A14
11
22
A13
A12
12
21
A7
13
20
A8
A6
14
19
A5
A9
15
18
A4
16
17
A11
OE
A4
16
17
A10
A5
15
18
A6
14
19
CS1
A7
13
20
I/O8
A12
12
21
A14
11
22
I/O7
A16
10
23
32-TSOP
NC
9
24
I/O6
VCC
8
Type1-Reverse
25
I/O5
A15
7
26
CS2
6
27
I/O4
WE
5
28
A13
4
29
A8
3
30
A9
2
31
A11
1
32
Function
Chip Select Input
Output Enable Input
Write Enable Input
Data Inputs/Outputs
Address Inputs
Power
Ground
No Connection
Figure 6-1 SRAM K6T1008C2E Specification
VCC
VCC
A18
32
1
A15
A15
A16
31
2
A17
A14
30
3
WE
WE
A12
29
4
A13
A13
A7
28
5
A8
A8
A6
27
6
A9
A9
A5
26
32-TSOP2
7
A11
A11
(Reverse)
A4
25
8
OE
OE
24
A3
9
A10
A10
23
A2
10
CS
CS
22
A1
11
I/O8
I/O8
21
A0
12
I/O7
I/O7
20
I/O1
13
I/O6
I/O6
19
I/O2
14
I/O5
I/O5
18
I/O3
15
I/O4
I/O4
17
VSS
16
Function
Write Enable Input
Chip Select Input
Output Enable Input
Address Inputs
Data Inputs/Outputs
Power
Ground
Figure 6-2 SRAM K6T4008C2E Specification
FUNCTIONAL BLOCK DIAGRAM
OE
Clk gen.
A10
CS1
I/O8
I/O7
I/O6
I/O5
I/O4
VSS
I/O3
I/O2
Raw
Row
I/O1
Address
select
A0
A1
A2
A3
A3
A2
A1
A0
I/O1
I/O2
Data
I/O
1
I/O3
cont
VSS
I/O
8
I/O4
I/O5
I/O6
I/O7
Data
I/O8
cont
CS1
A10
OE
CS
1
Control
CS
2
logic
WE
OE
FUNCTIONAL BLOCK DIAGRAM
Clk gen.
Row
select
Data
I/O
1
cont
I/O
8
Data
cont
CS
Control
WE
logic
OE
6 Reference Information
Precharge circuit.
Memory array
1024 rows
128×8 columns
I/O Circuit
Column select
Column Address
Precharge circuit.
Memory array
1024 rows
512×8 columns
I/O Circuit
Column select
6-3

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