Fluke Biomedical 942A-200L-M4 - Manual (Page 20)

942A-200L-M4 & 942A-200L-M5 UDR
Operator Manual
2-6
Table 2-1. Bus Timing Characteristics
Ident.
Number Characteristics Symbol MC6802NS
MC6802
MC6808 MC68A02
MC68A08 MC68B02
MC68B08 Unit
Min Max Min Max Min Max
1 Cycle Time
t
cyc 1.0 10 0.667 10 0.5 10 µs
2 Pulse Width, E Low
PW
EL 450 5000 280 5000 210 5000 ns
3 Pulse Width, E High
PW
EH 450 9500 280 9700 220 9700 ns
4 Clock Rise and Fall Time t r, t f --- 25 --- 25 --- 20 ns
9 Address Hold Time
t
AH 20 --- 20 --- 20 --- ns
12
Non-Muxed Address Valid
Time
t
AV1
t
AV2
16
--- ---
270 100
--- ---
--- 50
--- ---
---
ns
17 Read Data Setup Time t DSR 100 --- 70 --- 60 --- ns
18 Read Data Hold Time
t
DHR 10 --- 10 --- 10 --- ns
19 Write Data Delay Time
t
DDW --- 225 --- 170 --- 160 ns
21 Write Data Hold Time
t
DHW 30 --- 20 --- 20 --- ns
29
Usable Access Time (See Note
4)
t
ACC 605 --- 310 --- 235 --- ns
NOTES:
1. Voltage levels shown are v L < 0.4 V , V H < 2.4 V, unless otherwise specified.
2. Measurement points shown are 0.8 V and 2.0 V, unless otherwise noted.
3. All electricals shown for the MC6802 apply to the MC6802NS and MC6808, unless otherwise
noted.
4. Usable access time is computed by: 12 + 3 + 4 - 17.
5. If programs are not executed from on-board RAM, TAV1 applies. If programs are to be stored and
executed from on-board RAM, TAV2 applies. For normal data storage in the on-board RAM, this
extended delay does not apply. Programs cannot be executed from on-board RAM when using A
and B parts (MC68A02, MC68A08, MC68B02, MC68B08). ON-board RAM can be used for data
storage with all parts.
Figure 2-3. Read/Write Timing Diagram