SCN26562C4N48 查看數據表（PDF） - Philips Electronics
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SCN26562C4N48 Datasheet PDF : 17 Pages
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Philips Semiconductors
Dual universal serial communications controller (DUSCC)
Product specification
SCN26562
AC ELECTRICAL CHARACTERISTICS (Continued)
TxRQN
TxDAKN
WRN
tTALTAH
A
tTAHTAL
tTALTRH
MEMRN
EOPN
(INPUT)
D7–D0
EOPN
(OUTPUT)
B
tWDVTAH
tTAHWDI
tTALEOL
tEILTAH
tTAHEIH
tTAHEOF
NOTES:
A Ignored by the DUSCC since CEN is not asserted, but it can be used externally to qualify TxDAKN.
B Memory read signal; not seen by DUSCC.
Figure 14. DMA-Transmit Single Address Mode
SYMBOL
PARAMETER
tTAHTAL
tTALTAH
tTALTRH
tWDVTAH
tTAHWDI
tTALEOL
tTAHEOF
tEILTAH
tTAHEIH
Transmit DMA ACKN high to low time
Transmit DMA ACKN low to high time
Tx DMA ACKN low to Tx DMA REQN high
Write data valid to Tx DMA ACKN high
Tx DMA ACKN high to write data invalid
Tx DMA ACKN low to EOPN output low
Tx DMA ACKN high to EOPN output float
EOPN input low to Tx DMA ACKN high
Tx DMA ACKN high to EOPN input high
LIMITS
SCN26562C4
SCN26562C2
Min
Max
Min
Max
100
100
250
250
90
250
90
250
30
30
170
170
50
200
50
200
50
50
SD00216
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
1995 May 1
14
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