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DS80C390 Datasheet, PDF (35/58 Pages) Dallas Semiconductor – Dual CAN High-Speed Microprocessor
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MULTIPLEXED EXTERNAL PROGRAM MEMORY READ CYCLE
DS80C390
MOVX CHARACTERISTICS (Multiplexed address/data bus)
PARAMETER
SYMBOL MIN
MAX
UNITS STRETCH
VALUES
MOVX ALE Pulse Width
Port 0 MOVX Address,
CE0 − 4 , PCE0− 4 Valid to
ALE Low
Address Hold after MOVX
Read/Write
RD Pulse Width
tLHLL2
tAVLL2
tLLAX2
tRLRH
0.375 tMCS -5
0.5 tMCS -5
1.5 tMCS -10
0.125 tMCS -5
0.25tMCS -5
1.25 tMCS -10
0.125 tMCS -5
1.125 tMCS -5
0.5 tMCS -5
CST (MD2:0)
ns
CST = 0
1≤ CST ≤ 3
ns 4 ≤ CST ≤ 7
ns
CST = 0
1≤ CST ≤ 3
4 ≤ CST ≤ 7
ns 0≤ CST ≤3
ns 4 ≤ CST ≤ 7
ns
CST =0
WR Pulse Width
CST •tMCS -10
tWLWH
0.5 tMCS -5
1 ≤ CST ≤ 7
ns
CST =0
RD Low to Valid Data In
tRLDV
CST •tMCS -10
0.5 tMCS -20
1 ≤ CST ≤ 7
ns
CST =0
Data Hold after Read
Data Float after Read
tRHDX
tRHDZ
ALE Low to Valid Data In tLLDV
CST •tMCS -20
1 ≤ CST ≤ 7
0
ns
0.25 tMCS -5
ns
0.5tMCS -5
1.5 tMCS -5
0.625 tMCS -20
ns
(CST+0.25)•tMCS -40
(CST+1.25)•tMCS -40
CST = 0
1≤ CST ≤ 3
4 ≤ CST ≤ 7
CST = 0
1≤ CST ≤ 3
4 ≤ CST ≤ 7
35 of 58
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