Z84C90_12 Datasheet, PDF (50/56 Pages) Zilog, Inc. – KIO Serial/Parallel Counter/Timer

Z84C90 KIO Serial/Parallel Counter/Timer
Product Specification
43
Table 6. Daisy Chain Parameters
8 MHz
10 MHz
12.5 MHz
No. Symbol
18¹ TdM1(IEO)
19² TsIEI (IO)
Parameter
(PIO at #1)
(CTC at #1)
(SIO at #1)
(PIO at #3)
(CTC at #3)
Min Max Min Max Min Max Unit
160
150
125
ns
180
150
125
ns
230
200
160
ns
170
140
115
ns
170
160
135
ns
20³ TdIEI(IEOf)
21⁴ TdIEI(IEOr)
(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. Consider
the following calculation formulas:
1. Parameter 18: M1 falling to IEO delay TdM1(IEO) = TdM1(IEO)#1 + TdIEI(IEO)#2 + TdIEI(IEO)#3 + Output
Buffer Delay), in which TdIEI(IEO) refers to the worst-case number value between TdIEI(IEOr) and TdIEI(IEOf).
2. Parameter 19: IEI to IORQ falling setup time TsIEI(IO) = TdIEI(IEO)#1 + TdIEI(IEO)#2 + TdIEI(IEO)#3 + Input
Buffer Delay), in which TdIEI(IEO) refers to the worst-case number value between TdIEI(IEOr) and TdIEI(IEOf).
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).
5. In notes 1–4, TdIEI(IEO) refers to the worst-case number value between the parameters TdIEI(IEOr) and
TdIEI(IEOf).
The data that support the calculations in Table 6 are tabulated in Table 7.
Table 7. Daisy Chain Calculation Data*
8 MHz
10 MHz
12.5 MHz
Min
Max
Min
Max
Min
Max
Unit
Input Buffer Delay
10
10
10
ns
Output Buffer Delay
10
10
10
ns
8 MHz
PIO Part
CTC Part
SIO Part
ns
TdM1(IEO)
60
80
120
ns
TsIEI(IO)
70
70
70
ns
TdIEI(IEOf)
50
50
40
ns
TdIEI(IEOr)
50
50
40
ns
Note: *When using an interrupt from only a portion of the Z84C90 KIO, the numbers in this table are smaller than the
actual values. For example, in Figure 42 on page 42, if Device #1 is PIO, Device #2 is CTC, and Device #3 is
SIO, then at 12.5 MHz, Parameter #18 in Table 6, TdM1(IEO), is PIO TdM1(IEO) + CTC TdIEI(IEO) + SIO
(TdIEI(IEO) + Output Buffer. = 50 ns + 40 ns + 25 ns + 10 ns = 125 ns.
PS011804-0612
AC Characteristics