dp8344b National Semiconductor Corporation, dp8344b Datasheet - Page 94

• Manufacturer Part Number: dp8344b
• Description: Biphase Communications Processor?bcp
• Manufacturer: National Semiconductor Corporation

5 1 2 INSTRUCTION MEMORY INTERFACE (Continued)
Instruction Address Bus (Continued)
Instruction Bus
Timing Control
5 1 3 DATA MEMORY INTERFACE
Address Bus
Multiplexed Address Data Bus
IA9
IA8
IA7
IA6
IA5
IA4
IA3
IA2
IA1
IA0 (LSB)
I15 (MSB)
I14
I13
I12
I11
I10
I9
I8
I7
I6
I5
I4
I3
I2
I1
I0 (LSB)
IWR
ICLK
A15 (MSB)
A14
A13
A12
A11
A10
A9
A8
AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0 (LSB)
5 0 Device Specifications
Signal
In Out
In Out
In Out
In Out
In Out
In Out
In Out
In Out
In Out
In Out
In Out
In Out
In Out
In Out
In Out
In Out
In Out
In Out
In Out
In Out
In Out
In Out
In Out
In Out
In Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Pin
64
65
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
56
51
10
11
12
13
14
15
16
17
18
19
20
21
24
25
26
27
2
3
4
5
6
7
8
9
Reset
State
In
In
In
In
In
In
In
In
In
In
In
In
In
In
In
In
0
0
0
0
0
0
0
0
0
0
1
0
X
X
X
X
X
X
X
X
1
0
0
0
0
0
0
1
(Continued)
16-bit Instruction memory Address bus
16-bit Instruction memory data bus
Instruction WRite Instruction memory write strobe
Instruction CLocK Delimits instruction fetch cycles Rises during the first half of
T1 signifying the start of an instruction cycle and falls when the next instruction
address is valid
High byte of 16-bit memory Address
Low byte of 16-bit data memory Address multiplexed with 8-bit Data bus
94
Description