Z16C30_08 Datasheet, PDF (22/102 Pages) Zilog, Inc. – CMOS USC Universal Serial Controller

Z16C30
Product Specification
18
Table 5. Z16C30 AC Characteristics (Continued)
No Symbol
Parameter
Min
Max
123 TdTAKr(RDY)
TxACK Rise to RDY Rise
40
Delay
Notes
1. Direct address is any of A/B, D/C, or AD15–AD8 used as an address bus.
2. The parameter applies only when AS is not present.
3. Strobe (STB) is any of DS, RD, WR, PITACK, RxACK or TxACK.
4. Parameter applies only if read empties the receive FIFO.
5. Parameter applies only if write fills the transmit FIFO.
6. For extended temperature part TdDSI(Wf) max = 220 ns.
7. For extended temperature part TdDSF(TRQ) max = 75 ns.
Units
ns
Note
USC Timing
The USC interface timing is similar to that found on a static RAM, except that it is much
more flexible. Up to eight separate timing strobe signals may be present on the interface:
DS, RD, WR, PITACK, RxACKA, RxACKB, TxACKA, and TxACKB. Only one of
these timing strobes may be active at any time. Should the external logic activate more
than one of these strobes at the same time the USC will enter a pre-reset state that is only
exited by a hardware reset. Do not allow overlap of timing strobes. The timing diagrams
beginning on the next page illustrate the different bus transactions possible with the neces-
sary setup hold and delay times.
RESET
STB
113
114
Note: STB is any of DS, RD, WR, PITACK, RxACK, or TxACK
115
Figure 6. Reset Timing
DS007902-0708
PRELIMINARY
Electrical Characteristics