PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 201

• Manufacturer Part Number: PEF2091
• Description: ICs for Communications(ISDN Echocancellation Circuit)
• Manufacturer: Siemens Semiconductor Group

Figure 86
Semiconductor Group
(PMODE=ACT=TE=1)
and (BS=CBAC=0)
and (SGL=1)
*
**
) Unconditional transition if input combination is met
) ’X’ = undefined
State Machine for S/G Bit Control (part 1)
1
1
PMODE=0
or ACT=1
or TE=0
BS=1 and SGL=0
and CBAC=1
*
)
BS=1 and SGL=0
and CBAC=0
S/G transp. 1
D0=0;SG=1
D0=0;SG=1
(BS=SGL=1)
and CBAC=0
SG to 1
7
3
EOC=25
*
)
D0=0;SG=1
Reset
D0=0;SG=X**
D0=0;SG=0
D0=0;SG=1
SG-4T to 0
S/G transp.
201
SG-4T to 1
1
EOC=27
EOC=25
4a
(PMODE=ACT=TE=1)
and (BS=SGL=0)
4b
6
)
EOC=25, T4 set
EOC=25, T4 set
EOC=27
S/G transp. 0
T4 expired
T4 expired
D0=0;SG=0
Operational Description
8
*
)
D0=0;SG=0
Data Sheet 01.99
SG to 0
D0=0;SG=1
D0=0;SG=0
SG-4T to 1
SG-4T to 0
PEB 2091
2
PEF 2091
5a
5b