UM6522A Datasheet, PDF (4/17 Pages) UMC Corporation – Versatile Interface Adapter (VIA)

Peripheral Interface Characteristics
UiWSSZZ/A
TSR 1
TSRZ
Tm3
TIPW
TICW
TIPS
TICS
.TAI
‘-PDH
TPWI
TDPR
TDPL
Shlft-Out Delay Time - Time from r& Falling Edge
to CB2, Data Out
300
I “_IIC_.3 Lf
I
1”’
Shift-in Setup Time - Time from CB2 Data in to G2
R ising Edge
300
-
ns
33
External Shift Glock (CBl) Setup Time Relative to
& Trailing Edge
100
TCY
ns
59
Pulse Width - PB6 Input Pulse
2 x Tcy
-
5i
Pulse Width - CB1 Input Glock
2 xTCY -
5h
Pulse Spacing - PB6 Input Pulse
Pulse Spacing - CB1 Input Pulse
2xTCy
2 x Tcy
-
- +---+++
CAl, CB1 Set-Up Prior to Transition to Arm Latch
TC +50
ns [ 5h
Peripheral Data Hold After CAl, CB1 Transition
150
-
I
I
Set-Up Required on CAl, CBl, CA2 or CB2 Prior tc ’
Trictqering Edge
l
T _IC ,_T,_a,_” I
I
_₁
ns 1 5e
I
I
1 ns 1 5i
Shift Register Glock - Delay from $2
to CB1 Rising Edge
to CB1 Falling Edge
200
ns
5k
125
ns
5k
Timing Waveforms
READ IRA
OPERATION
c
CA2
“DATA TAKEN”
Figure 5a. CA2 Timing for Read Handshake, Pulse Mode
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