MAS281 Dynex, MAS281 Datasheet - Page 41

• Manufacturer Part Number: MAS281
• Description: MIL-STD-1750A Microprocessor
• Manufacturer: Dynex

8.0 TIMING PARAMETERS
NOTES:
NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Mil-Std-883, method 5005, subgroups 9, 10, 11
1. Unless otherwise noted, test condltions are as follows: OSC duty cycle = 50%, input rise and fall time < 5ns, timing
2. t = 1 OSC period. 0.5t implies a 50% OSC duty cycle; fractional t’s may be adjusted to reflect actual OSC duty cycle.
3. Data obtained by characterisation or analysis, is not routinely measured.
4. Add 1t for potential branch cycle.
5. Add 1t for internal XIO cycle; nt for n memory wait states.
6. Excluding DMA or HOLD conditions.
7. Measured to pre-Hi-Z steady state
8. Measurement minus 1x10
9. Output references SYNC, DMAK, and HLDAK drive into load 1.
10. Guaranteed by component LSI testing: not measured on microprocessor module.
RESET setup to SYNC lo (note 3)
RESET hold after SYNC lo (note 3)
RESET hi to RESET lo (note 3)
OSC hi to SYNC lo
OSC hi to SYNC hi
SYNC lo to SYNC lo (notes 4 & 5)
SYNC lo to AS hi (note 6)
SYNC lo to AS lo
SYNC lo to DS lo (read)
SYNC lo to DS hi (read)
SYNC lo to DS lo (write)
SYNC lo to DS hi (write) (note 5)
SYNC lo to DD lo
SYNC lo to DD hi
SYNC lo to Address valid
Address valid after SYNC lo
SYNC lo to AD Bus Hi-Z (read)
(notes 7 & 10)
SYNC lo to AD Bus active (read) (note 10) Load 2
SYNC lo to Data valid (write)
Data valid after SYNC lo (write)
Data set up to SYNC lo (read)
Data hold after SYNC lo (read) (note 8)
SYNC lo to M/IO, RD/VV, IN/OP valid
M/IO, RD/WN, IN/OP valid after SYNC lo Load 1
RDY setup to OSC lo
RDY hold after OSC lo
SYNC lo to DMAE valid
DMAE valid after SYNC lo
DMAR setup to SYNC lo
DMAR hold after SYNC lo
measured from 50% of VDD points.
Parameter
-7
in [1-(VlL-0 5/VDD-0.5)] nsecs.
10% of VDD.
Table 10. Timing Parameters
Test Condition
(notes 1 & 9)
Load 1
Load 1
Load 1
Load 1
Load 1
Load 1
Load 1
Load 1
Load 1
Load 1
Load 1
Load 2
Load 2
Load 2
Load 2
Load 2
Load 2
Load 1
Load 1
Load 1
Min.
(note 2)
-
-
2
10
10
5
1
2.5
3
10
3
4.5
3
20
-
3
-
15
-
12
20
0
-
5
15
5
-
5
20
10
T
T
T
T
T
T
+ 15
- 2
- 10
- 5
- 5
T
T
+ 20
-5
- 10
Max.
(note 2)
30
15
-
40
40
5
1
2.5
3
30
3
4.5
3
60
68
-
3
-
3
-
-
-
70
-
-
-
75
-
-
-
T
T
T
T
T
T
T
+ 45
+ 2
+ 5
+ 20
+ 22
+ 60
+ 50
T
T
+ 15
+ 10
Units
SYNC
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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