Acorn Products Z80 SECOND PROCESSSOR 409 用户手册

5.10.3 Tube Timing Diagram

N.B.The timing reference for the Post is 0 and R/W gives the 

direction of transfer.

For the parasite, the PCS direction is given by PNRDS 

or PNWDS, and timing by PCS.

MIN

MAX

1 R/W SET UP TO 02

35ns

2 TIMING STROBE PULSE WIDTH

110ns

3 ADDRESS SET UP TIME

35ns

4 ADDRESS & CHIP SELECT POLD TIMES

10ns

5 DATA OUT DELAY TIME

70ns

6 DATA OUT POLD TIME

10ns

7 DATA IN SET UP TIME

5Ons

8 DATA 1N HOLD T1ME

20ns

9 R/W POLD T1ME

10ns

10 CYCLE TIME

250ns

11 CS SET UP T1ME

20ns