dp8344b National Semiconductor Corporation, dp8344b Datasheet - Page 124

• 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
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 Two remote writes to instruction memory are necessary to store a 16-bit instruction word to IMEM low byte followed by high byte The timing of the 2nd
write is shown in the following diagram The first write is the same as a write of the PC or RIC as shown in Figure 5-23
Note 3 The maximum value for this parameter is the latest RAE REM-WR can be removed without delaying the remote access by one T-state
SU-RRW-CO
H-RRW-CO
H-RRW-X
SU-CMD-RRW
H-CMD-RRW
PD-RRW-X
AZ-AAD-LCL
ZA-LCL-AAD
PD-RDAT-I
H-RDAT-IWR
PD-RRW-WPND
PD-LCL-IA
ZA-IWR-I
AZ-IWR-I
PD-I-IWR
PD-LCL-IWR
PD-IWR-LCL
W-IWR
SU-CMD-WPND
H-CMD-WPND
PD-I-IA
SU-RRWr-CO
PD-X-WPND
Symbol
ID
10
11
12
13
14
15
16
17
18
19
20
21
22
23
1
2
3
4
5
6
7
8
9
RAE REM-WR Falling before CLK-OUT Rising
RAE REM-WR Rising after CLK-OUT Rising (Note 3)
RAE REM-WR Rising after XACK Rising
CMD Valid before RAE REM-WR Falling
CMD Invalid after RAE REM-WR Falling
RAE REM-WR Falling to XACK Falling
A AD Disabled before LCL Rising
A AD Enabled after LCL Falling
AD (Data) Valid to I Valid
AD (Data) Invalid after IWR Rising
RAE REM-WR Rising to WR-PEND Falling
LCL Falling to Next IA Valid
IWR Falling to I Enabled
IWR Rising to I Disabled
I Valid before IWR Rising
LCL Rising to IWR Falling
IWR Rising to LCL Falling
IWR Low Time
CMD Valid before WR-PEND Rising
CMD Invalid after WR-PEND Rising
I Disabled to IA Invalid
RAE REM-WR Rising before CLK-OUT Rising
XACK Rising to WR-PEND Rising
TABLE 5-25 Latched Write of IMEM (Notes 1 2)
(Continued)
Parameter
124
(n
(n
2T
Formula
T
IW
IW
a
T
T
T
a
T
T
T
T
T
a
a
H
H
L
T
a
a
a
a
a
T
a
a
a
1)T
2)T
H
H
a
a
a
a
b
b
b
b
b
b
b
Min
b
b
24
26
22
16
20
6
0
0
0
5
4
20
10
19
18
17
12
70
2
3
b
Max
26
30
34
52
13
5
20
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns