PSB3186FV1.4 Infineon Technologies, PSB3186FV1.4 Datasheet - Page 99
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PSB3186FV1.4
Manufacturer Part Number
PSB3186FV1.4
Description
ISDN Interface ISDN
Manufacturer
Infineon Technologies
Datasheet
1.PSB3186FV1.4.pdf
(207 pages)
Specifications of PSB3186FV1.4
Control Type
HDLC
Data Rate
192 Kbps
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Mounting Style
SMD/SMT
Operating Supply Voltage
3.3 V
Package / Case
MQFP-64
Lead Free Status / Rohs Status
Details
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PSB 3186
PSF 3186
Description of Functional Blocks
3.7.4
C/I Channel Handling
The Command/Indication channel carries real-time status information between the
ISAC-SX TE and another device connected to the IOM-2 interface.
1) One C/I channel (called C/I0) conveys the commands and indications between the
layer-1 and the layer-2 parts of the ISAC-SX TE. It can be accessed by an external layer-
2 device e.g. to control the layer-1 activation/deactivation procedures. C/I0 channel
access may be arbitrated via the TIC bus access protocol. In this case the arbitration is
done in IOM-2 channel 2 (see
Figure
35).
The C/I0 channel is accessed via register CIR0 (in receive direction, layer-1 to layer-2)
and register CIX0 (in transmit direction, layer-2 to layer-1). The C/I0 code is four bits
long. A listing and explanation of the layer-1 C/I codes can be found in
Chapter
3.5.2.
In the receive direction, the code from layer-1 is continuously monitored, with an interrupt
being generated anytime a change occurs (ISTA.CIC). 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) can be used to convey real time status information
between the ISAC-SX TE and various non-layer-1 peripheral devices e.g. PSB 2161
ARCOFI-BA. The C/I1 channel consists of four or six bits in each direction.The width can
be changed from 4bit to 6bit by setting bit CIX1.CICW.
In 4-bit mode 6-bits are written whereby the higher 2 bits must be set to “1” and 6-bits
are read whereby only the 4 LSBs are used for comparison and interrupt generation (i.e.
the higher two bits are ignored).
The C/I1 channel is accessed via registers CIR1 and CIX1. A change in the received
C/I1 code is indicated by an interrupt status without double last look criterion.
CIC Interrupt Logic
Figure 52
shows the CIC interrupt structure.
A CIC interrupt may originate
– from a change in received C/I channel 0 code (CIC0)
or
– from a change in received C/I channel 1 code (CIC 1).
The two corresponding status bits CIC0 and CIC1 are read in CIR0 register. CIC1 can
be individually disabled by clearing the enable bit CI1E in the CIX1 register. In this case
the occurrence of a code change in CIR1 will not be displayed by CIC1 until the
corresponding enable bit has been set to one.
Bits CIC0 and CIC1 are cleared by a read of CIR0.
An interrupt status is indicated every time a valid new code is loaded in CIR0 or CIR1.
Data Sheet
99
2000-08-23
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