pef80913 Infineon Technologies Corporation, pef80913 Datasheet - Page 64
pef80913
Manufacturer Part Number
pef80913
Description
2b1q Second Gen. Modular Isdn Nt
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEF80913.pdf
(240 pages)
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Figure 24
2.3.4
The Command/Indication channel carries real-time status information between the Q-
SMINT I and another device connected to the IOM -2.
1) C/I0 channel lies in IOM -2 channel 0 and access may be arbitrated via the TIC bus
access protocol. In this case the arbitration is done in IOM -2 channel 2.
The C/I0 channel is accessed via register CIR0 (received C/I0 data from DD) and
register CIX0 (transmitted C/I0 data to DU). The C/I0 code is four bits long.
In the receive direction, the code from layer-1 is continuously monitored, with an interrupt
being generated any time a change occurs (ISTA.CIC).
C/I0 only: a new code must be found in two consecutive IOM -2 frames to be considered
valid and to trigger a C/I code change interrupt status (double last look criterion).
In the transmit direction, the code written in CIX0 is continuously transmitted in C/I0.
2) A second C/I channel (called C/I1) lies in IOM -2 channel 1 and is used to convey real
time status information of the on-chip S-transceiver or an external device. The C/I1
channel consists of four or six bits in each direction. The width can be changed from 4
bit to 6 bit by setting bit CIX1.CICW.
Data Sheet
C/I Channel Handling
MONITOR Interrupt Structure
MASK
WOV
MOS
CIC
INT
ST
S
1
U
1
ISTA
WOV
MOS
CIC
ST
S
U
0
0
50
MOCR
MRE
MIE
Functional Description
MOSR
MDR
MER
MDA
MAB
PEF 82912/82913
2001-03-30
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