STLC5466 STMicroelectronics, STLC5466 Datasheet - Page 20

• Manufacturer Part Number: STLC5466
• Description: RF Wireless Misc Multi-HDLC Sw Matrix
• Manufacturer: STMicroelectronics
• Type: Telecom ICr

Specifications of STLC5466

• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: LQFP-176
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

STLC5466
The GCI or V* channels are composed of 4 bytes
and have both the same general structure.
B1, B2 : Bytes of data. Those bytes are not af-
MON
S/C
Only Monitor handshakes and S/C bytes are dif-
ferent in the three protocols:
ISDN V* S/C byte
ISDN GCI S/C byte
Analog GCI S/C byte
CI : The Command/Indicate channel is used for
D : These 2 bits carry the 16 kbit/s ISDN basic
In GCI protocol, A and E are the handshake bits
and are used to control the transfer of information
on monitor channels.The E bit indicates the trans-
fer of each new byte in one direction and the A bit
acknowledges this byte transfer in the reverse di-
rection.
In V* protocol, there isn’t any handshake
mode.The transmitter has only to mark the validity
of the Monitor byte by positioning the E bit (T is not
used and is forced to “1”).
For more information about the GCI and V*, refer
to the General Interface Circuit Specification
(issue1.0, march 1989) and the France Telecom
Specification about ISDN Basic Access second
generation (November 1990).
III.3.3 - Structure of the Treatment
In reception GCI/V* TDM’s are connected to DIN 4
and DIN 5. The D channels are switched through
the matrix towards the output 7 and output6 then
towards the HDLC receivers. The Monitor and S/C
bytes are multiplexed and sent to the CI and Mon-
itor receivers.
In transmission, the S/C and Monitor bytes are re-
combined by multiplexing the information provided
by the Monitor, C/I and the HDLC Transmitter.
Like in reception, the D channel is switched
through the matrix (input 7 towards DOUT 4 and
DOUT 5).
20/130
D 2 bits
D 2 bits
B1
activation/deactivation of lines and control
functions.
access D channel.
: Monitor channel for operation and
: Signalling and control information.
fected by the monitor and CI protocols.
maintenance information.
C/I 6 bits
B2
C/I 4 bits
C/I 4 bits
MON
T
A
A
S/C
E
E
E
III.3.4 - CI and Monitor Channel Configuration
Monitor channel data is located in a time slot; the
CI and monitor handshake bits are in the next time
slot.
Each channel can be defined independently. A ta-
ble with all the possible configurations is present-
ed hereafter (Table 13).
Table 13: C/I and MON Channel Configuration
Note: A mix of V* and GCI monitoring can be performed for two dis-
tinct channels in the same application.
III.3.5 - CI and Monitor Transmission/Reception
Command
The reception of C/I and Monitor messages are
managed by two interrupt queues.
In transmission, a transmit command register is
implemented for each C/I and monitor channel
(16C/I transmit command registers and 16 Monitor
transmit command registers). Those registers are
accessible in read and write modes by the micro-
processor.
III.4 - Scrambler and Descrambler
The TDM4 and TDM5 can be GCI multipexes.
Each GCI multipex comprises 8 GCI channels.
Each GCI channel comprises two B channels at
64 Kbit/s.
In reception it is possible to switch and to scramble
the contents of 32 B channels of GCI channels to
32 timeslots of the 256 output timeslots. In trans-
mission these 32 timeslots are assigned to 32 B
channels.
In the other direction the contents of an selected B
channels is automatically switched and descram-
bled to one B channel of 16 GCI channel.
See SCR bit of Connection Memory Data Register
CMDR (0E)H.
III.5 - Connection between “ISDN channels”
and GCI channels.
Three timeslots are assigned to one “ISDN chan-
nels”. Each “ISDN channels” comprises three
channels: B1+B2+B* with B*= D1,D2, A, E, S1,
S2, S3, S4 (See figure).
– Upstream. From GCI channels to ISDN chan-
• in reception: 16 GCI channels (B1+B2+MON+
nels.
D+C/I),
Monitor validated
C/I validated
or not
or not
CI For analog subscriber (6 bits)
CI For ISDN subscriber (4 bits)
Monitor GCI
Monitor V*