PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 204

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

Semiconductor Group
I
Table 34
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
Table 35
No.
1
2
Signal name
PMODE
TE
ACT
BS
SGL
CBAC
EOC=25
EOC=27
T1 set
T1 expired
TD1 set
TD1 expired
BAC
Signal name
SG
D0
State Machine Input Signals for S/G Control
State Machine Output Signals for S/G Control
Corresponds to the PMODE pin. Set to "1" (only) in the
microprocessor mode
This input is set to "1" (only) in the TE mode
"1" on this input indicates receive synchronization (e.g. in
the Transparent state, see User’s Manual 02.95 of the PEB
2091-Version 4.3, page 175).
SWST:BS bit.
SWST:SGL bit.
ADF:CBAC bit.
This input indicates that the EOC code 25h (stop) was
received from the U-interface.
This input indicates that the EOC code 27h (go) was
received from the U-interface.
An internal 500 micro seconds timer is enabled.
The 500 micro seconds timer (see 9) has expired.
An internal timer TD1 is enabled. The length of this timer
depends on the position of the EOC frame in the currently
received U data. It varies between 7.5 and 15 ms.
The timer TD1 has expired, (see 11).
BAC bit on DIN. This is bit no. 27 positioned in the third
IOM
Value of the S/G bit on DOUT. The S/G bit is bit no. 27 in the
third slot on DOUT.
Sets the D channel upstream to "0" if active ("1")
®
-2 slot
204
Description
Description
Operational Description
Data Sheet 01.99
PEB 2091
PEF 2091