Digital PMR Radio Processor
CMX7131/CMX7141
Rx enabled
AFSD active
4FSK dormant
AFSD process
no
no
FS2 detected?
FS1 detected?
IRQ FS1
IRQ FS2
AFSD off
AFSD off
4FSK active
4FSK active
Demodulate
Demodulate
Analyse RICH
Analyse SACCH
data decode
de-interleave
no
FS2 detected?
IRQ FS2
Analyse RICH
Analyse SACCH
data decode
Analyse RICH
Analyse SACCH
data decode
de-interleave
de-interleave
no
no
ID matched?
ID matched?
IRQ Called
IRQ DataRDY
(RI+SACCH+ LE)
IRQ Called
IRQ DataRDY
(RI+SACCH)
Enable Vocoder
Transfer data to
Vocoder
Process data
no
END detected?
Disable Vocoder
IRQ DataRDY
(END)
Figure 14 FS Detection
2014 CML Microsystems Plc
Page 28
D/7141_FI-3.x/6
CMLMICRO [ CML MICROCIRCUITS ]
