Z84C90

KIO Serial/Parallel Counter Timer

PS011802-0902

19

(PIO at #3)

170

140

115

ns

(CTC at #3)

170

160

130

ns

(SIO at #3)

180

160

130

ns

160

150

125 ns

160

150

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).

Table 6.Daisy Chain Parameters (Continued)

8 MHz

10 MHz

12 MHz

No. Symbol

Parameter

Min

Max

Min

Max

Min

Max

U/M