Z84C90 Datasheet, PDF (24/31 Pages) Zilog, Inc. – KIO Serial/Parallel Counter Timer

Z84C90
KIO Serial/Parallel Counter Timer
19
Table 6.Daisy Chain Parameters (Continued)
8 MHz
10 MHz
12 MHz
No. Symbol
19² TsIEI (IO)
Parameter
(PIO at #3)
Min Max Min Max Min Max U/M
170
140
115
ns
(CTC at #3)
170
160
130
ns
20³ TdIEI(IEOf)
21⁴ TdIEI(IEOr)
(SIO at #3)
180
160
160
160
150
150
130
ns
125 ns
125 ns
Notes: to calculate Z80 KIO daisy-chain timing, use the Z80 PIO, CTC, and SIO with I/O buffers on the chain. The
following are calculation formulas:
1. Parameter 18: M1 falling to IEO delay TdM1(IEO) = TdM1(IO)#1 + TdIEI(IEO)#2 + TdIEI(IEO)#3 + Output Buffer
Delay).
2. Parameter 19: IEI to IORQ falling setup time TsIEI(IO) = TdIEI(IEO)#1 + TdIEI(IEO)#2 + TdIEI(IEO)#3 + Input
Buffer Delay).
3. Parameter 20: IEI falling delay = TdIEI(IEOf) - TdIEI(IEOf)PIO + TdIEI(IEOf)CTC + TdIEI(IEOf)SIO + (Input buffer
Delay) + (Output Buffer Delay).
4. Parameter 21: IEI rising to IEO rising delay (after ED decode) - TdIEI(IEOr) = TdIEI(IEOr)PIO + TdIEI(IEOr)CTC
+ TdIEI(IEOr)SIO + ((Input buffer Delay) + (Output Buffer Delay).
PS011802-0902