FX919A Datasheet, PDF (21/44 Pages) CML Microcircuits – 4-Level FSK Modem Data Pump

4-Level FSK Modem Data Pump
FX919A
Modem Rx input
Symbols to
De-interleave circuit
Data from Data Block Buffer
Task to Command Register
BFREE bit
for task #1
t3
1
t6
for task #2
for task #3
t3
t3
1
t6
2
2
3
t6
3 _t7
t7
t7
Figure 11 Receive Task Timing Diagram
t3 Time to receive all symbols of task
t6 Maximum time between first symbol of task
entering the de-interleave circuit and the
task being written to modem.
t7 Maximum time from the last bit of the task
entering the de-interleave circuit to BFREE
going to a logic '1' (high)
Task
SFS
SFSH
RHB/RILB
R4S
SFS
SFSH
RHB/RILB
R4S
Any
Time
(symbol times)
24 (minimum)
90 (minimum)
66
4
21
21
49
3
1
© 1996 Consumer Microcircuits Limited
21
D/919A/4