TSC80251G2D
11.2 AC Characteristics - Real-Time Synchronous Wait State
Definition of symbols
Table 47. Real-Time Synchronous Wait Timing Symbol Definitions
Signals
Conditions
C
WCLK
L
Low
R
RD#/PSEN#
WR#
V
X
Valid
W
Y
No Longer Valid
WAIT#
Timings
Table 48. Real-Time Synchronous Wait AC Timings; V = 2.7 to 5.5 V, T = -40 to 85°C
DD
A
Symbol
Parameter
Min
Max
Unit
T
T
T
T
Wait Clock Low to Wait Set-up
0
T
- 20
ns
ns
ns
ns
ns
ns
CLYV
CLYX
RLYV
RLYX
WLYV
WLYX
OSC
Wait Hold after Wait Clock Low
PSEN#/RD# Low to Wait Set-up
Wait Hold after PSEN#/RD# Low
WR# Low to Wait Set-up
2W·T
2W·T
2W·T
+ 5
+ 5
+ 5
(1+2W)·T
- 20
- 20
- 20
OSC
OSC
0
T
- 20
OSC
(1+2W)·T
OSC
OSC
T
T
0
T
- 20
OSC
Wait Hold after WR# Low
(1+2W)·T
OSC
OSC
Waveforms
State 1
State 2
State 3
State 1 (next cycle)
WCLK
T
min
CLYX
T
max
CLYX
ALE
T
CLYV
RD#/PSEN#
RD#/PSEN# stretched
T
T
max
RLYX
min
RLYX
T
RLYV
WAIT#
P0
A7:0
D7:0
stretched
stretched
A7:0
P2
A15:8
A15:8
Figure 22. Real-time Synchronous Wait State: Code Fetch/Data Read
Rev. A - May 7, 1999
45
TEMIC [ TEMIC SEMICONDUCTORS ]
