MT9173AN1 View Datasheet(PDF) - Zarlink Semiconductor Inc

Part Name

Description

Manufacturer

MT9173AN1

ISO2-CMOS ST-BUS™ FAMILY Digital Subscriber Interface Circuit with RxSB Digital Network Interface Circuit with RxSB

Zarlink Semiconductor Inc 

MT9173/74

Data Sheet

and 144 kbit/s as required for the basic rate interface in ISDN. Full duplex transmission is made possible through

on board adaptive echo cancellation.

The DNIC has various modes of operation which are selected through the mode select pins MS0-2. The two major

modes of operation are the MODEM (MOD) and DIGITAL NETWORK (DN) modes. MOD mode is a transparent 80

or 160 kbit/s modem. In DN mode the line carries the B and D channels formatted for the ISDN at either 80 or

160 kbit/s. In the DN mode the DV and CD ports are standard ST-BUS and in MOD mode they are transparent

serial data streams at 80 or 160 kbit/s. Other modes include: MASTER (MAS) or SLAVE (SLV) mode, where the

timebase and frame synchronization are provided externally or are extracted from the line and DUAL or SINGLE

(SINGL) port modes, where both the DV and CD ports are active or where the CD port is inactive and all

information is passed through the DV port. For a detailed description of the modes see “Operating Modes” section.

In DIGITAL NETWORK (DN) mode there are three channels transferred by the DV and CD ports. They are the B, C

and D channels. The B1 and B2 channels each have a bandwidth of 64 kbit/s and are used for carrying PCM

encoded voice or data. These channels are always transmitted and received through the DV port (Figures 3, 4, 5,

6). The C-channel, having a bandwidth of 64 kbit/s, provides a means for the system to control the DNIC and for the

DNIC to pass status information back to the system. The C-channel has a Housekeeping (HK) bit which is the only

bit of the C-channel transmitted and received on the line. The 2B+D channel bits and the HK bit are double-

buffered. The D-channel can be transmitted or received on the line with either an 8, 16 or 64 kbit/s bandwidth

depending on the DNIC’s mode of operation. Both the HK bit and the D-channel can be used for end-to-end

signalling or low speed data transfer. In DUAL port mode the C and D channels are accessed via the CD port

(Figure 7) while in SINGL port mode they are transferred through the DV port (Figures 5, 6) along with the B1 and

B2 channels.

F0

C4

DSTo

D0 D1 D2 D3 D4 D5 D6 D7 C0 C1 C2 C3 C4 C5 C6 C7 B7 B6 B5 B4 B3 B2 B1 B0

D0

DSTi

D0 D1 D2 D3 D4 D5 D6 D7 C0 C1 C2 C3 C4 C5 C6 C7 B7 B6 B5 B4 B3 B2 B1 B0

D0

F0o

11.7 µsec

Channel Time 0

D-Channel

Channel Time 1

C-Channel

Channel Time 2

B1-Channel

Figure 5 - DV Port - 80 kbit/s (Modes 0,4)

F0

C4

DSTo

D0 D1 D2 D3 D4 D5 D6 D7 C0 C1 C2 C3 C4 C5 C6 C7 B7 B6 B5 B4 B3 B2 B1 B0 B7 B6 B5 B4 B3 B2 B1 B0

D0

DSTi

D0 D1 D2 D3 D4 D5 D6 D7 C0 C1 C2 C3 C4 C5 C6 C7 B7 B6 B5 B4 B3 B2 B1 B0 B7 B6 B5 B4 B3 B2 B1 B0

D0

F0o

15.6 µsec

Channel Time 0

D-Channel

Channel Time 1

C-Channel

Channel Time 2

B1-Channel

Channel Time 3

B2-Channel

Figure 6 - DV Port - 160 kbit/s (Modes 0,4)

5

Zarlink Semiconductor Inc.

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