GMSK Packet Data Modem
CMX909B
Figure 9 Transmit Mode Timing Diagram
Task
Typical time
(bit-times)
t1
t2
Time from writing first task (modem in ‘idle’
state) to application of first transmit bit to Tx
Low Pass filter
Any
1
Time from application of first bit of
task to Tx Low Pass filter until BFREE
goes to a logic ‘1’ (high)
T7H
TQB
TDB
TSB
TSD
36
24
20
1
6
t3
t4
Time to transmit all bits of task
T7H
TQB
TDB
TSB
TSD
56
32
240
8
72
Max time allowed from BFREE going to a
logic ‘1’ (high) for next task (and data) to
be written to modem
T7H
TQB
TDB
TSB
TSD
18
6
218
6
64
ã 2001 Consumer Microcircuits Limited
23
D/909B/1
CMLMICRO [ CML MICROCIRCUITS ]
