Timing Information ......
Control instructions are input to the FX375 by serial (figure 3) or parallel
(figure 4) means, using Data Inputs and Load/Latch as shown in the diagrams below.
D
4
SERIAL MODE
ENABLE
D
5
t
SMS
SERIAL CLOCK
t
DH
t
DS
t
PWH
t
PWL
SERIAL DATA
INPUT
t
LL
t
LLW
LOAD/LATCH
Fig.3 Serial Load Timing
Min.
Serial
Serial Mode Enable Set Up Time – (t
SMS
)
Clock 'High' Pulse Width – (t
pWH
)
Clock 'Low' Pulse Width – (t
pWL
)
Data Set Up Time – (t
DS
)
Data Hold Time – (t
DH
)
Load/Latch Set Up Time – (t
LL
)
Load/Latch Pulse Width – (t
LLW
)
Figure 3
250
250
250
150
50
250
150
Figure 4
200
150
–
50
Typ.
–
–
–
–
–
–
–
–
–
–
–
Max.
–
–
–
–
–
–
–
–
–
50
–
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Parallel
Data Valid Time – (t
VP
)
Load Time – (t
L
)
Fall Time – (t
F
)
Data Hold Time – (t
H
)
Serial Loading Sequence
:
With Load/Latch at logic '0' serial data is loaded in the sequence :-
D
5
, D
4
, D
3
, D
2
, D
1
, D
0
, Rx/Tx, Private Enable.
When these 8 bits have been clocked in on the rising clock edge,
data is latched by strobing the Load/Latch input – " 0 – 1 – 0 " (Figure 3).
Table 4 Timing
- DATA INPUTS -
D0 – D5
Rx/Tx
PRIVATE ENABLE
t
VP
t
L
LOAD/LATCH
t
F
t
H
LOAD DATA
DATA LATCHED
Fig.4 Parallel Load Timing
6
CMLMICRO [ CML MICROCIRCUITS ]
