W6692 Datasheet, PDF (46/104 Pages) Winbond – PCI Bus ISDN S/T-Controller

Preliminary Data Sheet
W6692 PCI ISDN S/T-Controller
CH0
CH1
CH2
B1
B2 MON0 D C/I0 IC1 IC2
MON1 C/I1
C/I2
B1
B2
1^st Octet
4^th Octet
Monitor
2^nd Octet
D
C/I
MR MX
3^rd Octet
FIG 7.8 GCI MODE CHANNEL STRUCTURE
GCI slave mode: connects to U transceiver such as PEB 2091, CH0 used only.
GCI master mode: connects to PSB 2165 ARCOFI, uses B1, B2, IC1 and IC2 for voice communication, uses MON1 for
programming, uses C/I1 for pins SA-SD access.
The GCI signals are:
DD/DU
DCL
FSC
: 768 Kbps
: 1.536 MHz
: 8 KHz
7.8.1 GCI Mode C/I0 Channel Handling
The Command/Indication channel 0 carries real-time status information between the W6692 and another device connected to
the GCI bus interface.
One C/I0 channel conveys the commands and indications between a layer 1 device and layer 2 device. This C/I0 channel is
accessed via register CIR (in receive direction, layer 1 to layer 2) and register CIX (in transmit direction, layer 2 to layer 1). The
C/I code is 4-bit long.
• In the receive direction, the code from layer 1 is continuously monitored, with an interrupt being generated anytime a
change occurs. A new code must be found in two consecutive GCI frames to be consided valid and to trigger a C/I code
change interrupt status (double last look criterion).
• In the transmit direction, the code written in CIX is continuously transmitted in the channel.
7.8.2 GCI Mode Monitor Channel Handling
The Monitor channel protocol is a handshake protocol used for high speed information exchange between the W6692 and other
devices. The Monitor channel is necessary for:
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Publication Release Date: Sep 30, 1999
Revision 0.9