AK2358F Datasheet, PDF (21/26 Pages) Asahi Kasei Microsystems – Base-band LSI for Europian Cordless Telephones(CTI, CTI+)

ASAHI KASEI
MSK Signal Reception
USK signal r e c e p t i o n
d=^{FSL set to “O”.}
[AK2358FI
: S e t s o t h a t a frase d e t e c t i o n s i g n a l ( F D ) i s p u t o u t fros
t h e RDF/FD p i n .
N
: Synchronization frame detection?
RXAFSW = “1”
I
7 ^{FSL set to “ 1”}
: Reception voice u ute
: S e t s o t h a t a n NSK s i g n a l r e c e p t i o n f l a g (RDF) i s p u t o u t
from t h e RDF/FD p i n .
N
: Reception of 8 bit of data?
Reception data read i ng
: R e a d i n g o f 8 b i t o f d a t a . c h a n g e t o RDF/FD = “ H ”
I
FCLN set to “O”
I
I
I
A
: Waiting for the next synchronization frame
(1) If the internal register “FCLN” is “O”, the internal nodes RDATA, RCLK are fixed to
“l”.
(2) After a synchronization frame is detected, FD goes to “L” during the period “T”, then
FCLN is set to “l”.
(3) RDATA and RCLK put out the data following to the synchronized frame pattern, and these
are stored in the internal buffer.
(4) After 8 bit of reception data have been entered to the internal buffer, RDF goes “L”.
(5) After the CPU detect that RDF is “L”, it puts out 8 clock bits to SCLK, then read 8
bit of reception data from the SDATA pin.
(6) with input of 8 clock bits to SCLK, RDF goes “H”.
(7) Afterwards, by repeating the steps (4) and (5) the necessary data bits are read.
(8) After the necessary data have been read, DIR goes “H”, “FCLN” is set to “O” via the
serial interface, the internal nodes RDATA and RCLK are set to “l”, then the system
waits for lhe next synchronization frame.
0152-E-00
-20”
1996/12