dp8344b National Semiconductor Corporation, dp8344b Datasheet - Page 110

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

t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
5 0 Device Specifications
Note 1 All parameters are individually tested and guaranteed Interpreting this data by numerically adding two or more parameters to create a new timing
specification may lead to invalid results
Note 2 The maximum value for this parameter is the latest RAE REM-RD can be removed without adding a T-state to the remote access
Note 3 Two remote reads from instruction memory are necessary to read a 16-bit instruction word from IMEM low byte followed by high byte The timing for the
two reads are the same except that IA is incremented after the high instruction memory byte is read
SU-RRR-CO
H-RRR-X
SU-CMD-RRR
H-CMD-RRR
PD-RRR-X
PD-X-LCL
PD-LCL-X
PD-RRR-LCL
AZ-LCL-A
ZA-A-LCL
PD-IMEM-X
PD-RRR-IMEM
PD-LCL-IMEM
W-IMEM
PD-LCL-IA
Symbol
ID
10
11
12
13
14
15
1
2
3
4
5
6
7
8
9
RAE REM-RD Falling before CLK-OUT Rising
RAE REM-RD Rising after XACK Rising (Note 2)
CMD Valid before RAE REM-RD Falling
CMD Invalid after RAE REM-RD Falling
RAE REM-RD Falling to XACK Falling
XACK Falling to LCL Rising
LCL Rising to XACK Rising
RAE REM-RD Rising to LCL Falling
A Disabled after LCL Rising
A Enabled before LCL Falling
AD (IMEM) Valid before XACK Rising
AD (IMEM) Invalid after RAE REM-RD Rising
LCL Rising to AD (IMEM) Valid
(IMEM) Valid
LCL Falling to Next IA Valid (Note 3)
TABLE 5-13 Buffered Read of IMEM (Note 1)
(Continued)
FIGURE 5-13 Buffered Read of IMEM
Parameter
110
(n
(n
(n
Formula
T
IW
IW
IW
a
T
T
T
T
T
T
a
a
T
a
L
H
H
T
a
a
a
a
a
a
a
2)T
1)T
1)T
H
a
a
a
a
b
b
b
Min
b
22
26
15
10
0
0
3
0
8
10
18
25
5
Max
b
26
22
44
8
32
TL F 9336 – 67
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns