PSB7238 SIEMENS [Siemens Semiconductor Group], PSB7238 Datasheet - Page 49

• Manufacturer Part Number: PSB7238
• Description: Joint Audio Decoder-Encoder - Multimode
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Figure 19
For the frame sync signal RFS and/or TFS, two basic modes of operation are provided:
Case 1
If control bit RCONT = 1, pulses on RFS are continuously and periodically generated if
ERFS (Enable RFS generation control bit in HDLC register bank) is set to ‘1’, of one bit
period length and spaced (PRD + 1)
Note: It suffices that the ERFS bits in one of the HDLC controller register banks is set to
Case 2
If RCONT = 0, a burst of REP + 1 pulses on RFS is generated, of one bit period duration
and spaced 16 bit periods apart when a start command is issued by setting the STR bit
to ‘1’. REP takes a value in the range 0 to 1.023.
Note: It suffices that the STR command in one of the HDLC controller register banks is
The same applies for TFS (control bits are ETFS and STX).
Semiconductor Group
DSP clock
“1” in order for pulses to be generated.
issued in order for the generation of pulses start.
SCLK (in)
Timing Generation on SAI Lines - Frame Sync
PRSC
Div
10
SCKIN
0
1
M
U
X
SCLK (out)
16 bits apart, where PRD = 0, 1,
STR/ERFS
STX/ETFS
49
1
1
Baud-Rate
Generator
Baud-Rate
Generator
RCONT RPRD/RREP
TCONT TPRD/TREP
RFS(in)
TFS(in)
1
1
10
10
RFIN
0
1
TFIN
0
1
Data Sheet 1998-07-01
M
U
X
M
U
X
Functional Blocks
, 31.
PSB 7238
RFS (out)
TFS (out)