PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 186

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

Semiconductor Group
Initialization
Read request
For each requested coefficient 16 bit are returned in the following manner
Table 31
Register
Echo Canceller
Equalizer
For more information about MON-8 commands and codes, see "MON-8 Codes", page
228.
4.7
Test loop-backs are specified by the national PTTs in order to facilitate the location of
defect systems. Four different loop-backs are defined. The position of each loop-back is
illustrated in Figure 80.
1) Binary complement format (FFFF
MON-8 (1. Byte)
MON-8 (1. Byte)
Test Loop-Backs
Internal Coefficient Addresses
(2. Byte)
(2. Byte)
(3. Byte)
(4. Byte)
H
= –1d)
Address Range (decimal) 1. Filter Coefficient
6 … 41
44 … 69
1 0 0 0
a a a a
1 0 0 0
d d d d
1 0 0 0
d d d d
1 0 0 0
a a a a
1 0 0 0
d d d d
1 1 0 0
d d d d
186
; Select register access
; Coefficient address
; Data bits D0 – D7
; Data bits D8 – D15
41
69
Operational Description
1)
1)
Data Sheet 01.99
PEB 2091
PEF 2091