PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 100

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

Semiconductor Group
4.1.3
Setting SWST:CI to "1" enables the microprocessor to access C/I-commands and
indications between IOM
A change in two consecutive frames (double last look) in the C/I-channel on IOM
indicated by an interrupt ISTA:CICI. The received C/I-command can be read from
register CIRI. A change in the C/I-channel coming from the transceiver core is indicated
by an interrupt ISTA:CICU. The new C/I-indication can be read from register CIRU.
Note 30: The term C/I-indication always refers to a C/I-code coming from the
A C/I-code going to the transceiver core has to be written into the CIWU-register. A
C/I-code to IOM
registers (CIWU and CIWI) will be transferred at the next available IOM
registers are not cleared after the transfer. Therefore, it is possible to continuously send
C/I codes to IOM
once.
C/I-commands to the transceiver core have to be applied at least for two IOM
(250 µs) to be considered as valid.
For more information see section 5.2.7, page 217 and thereafter. See also "Interrupt
Structure", page 209.
In TE mode (i.e. 1.536 MHz DCL), the ADF2:TE1 bit is used to direct the C/I-channel
access either to IOM
the IOM
terminal devices such as the ARCOFI
code going to IOM
If written to IOM
ADF2:TE1 bit is 1, the C/I Channel on IOM
the IOM
See also "ADF2-Register", page 214 for more information about this register.
®
®
-2 interface to the transceiver core.
-2 terminal structure (ADF2:TE1 = 1), see Figure 41. This allows to program
transceiver core, whereas the term C/I-command refers to a C/I-code going
into the transceiver core.
C/I Channel Access
®
®
®
-2 has to be written into the CIWI-register. The contents of both
®
-2 channel 1 this C/I code is 6 bits long (ADF2:TE1 = 1). If the
-2 or the transceiver core by only writing the code into the register
-2 is 4 bits long if it is written to IOM
®
-2 channel 0 (ADF2:TE1 = 0, default) or to IOM
®
-2 and the transceiver core.
®
via the processor interface of the IEC-Q. The C/I
100
®
-2 channel 0 is passed transparently from
®
-2 channel 0 (ADF2:TE1 = 0).
Operational Description
®
Data Sheet 01.99
-2 channel 1 of
®
-2 frame. The
PEB 2091
PEF 2091
®
-2 frames
®
-2 is