MC145474 Просмотр технического описания (PDF) - Motorola => Freescale

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MC145474

ISDN S/T Interface Transceiver

Motorola => Freescale 

SECTION 1

INTRODUCTION

1.1 INTRODUCTION

The MC145474 and the MC145475 provide an economical VLSI layer 1 interface for the

transportation of two 64 kpbs B channels and one 16 kbps D channel between the network

termination or NT and terminal equipment applications or TEs. Both the MC145474 and the

MC145475 conform to CCITT I.430 and ANSI T1.605 specifications.

The MC145474/75 provide the modulation/line drive and demodulation/line receive functions

required of the interface. In addition, the MC145474/75 provides the activation/deactivation, error

monitoring, framing, bit, and octet timing. The MC145474/75 provides the control signals for the

interface to the layer 2 devices. Complete multiframe capability is provided.

The MC145474/75 features the interchip digital link (IDL) for the exchange of the 2B+D channel

information between ISDN components and systems. The MC145474/75 provides an industry

standard serial control port (SCP) to program the operation of the transceiver.

1.2 ORGANIZATION OF DATA SHEET

This data sheet is comprised of fifteen sections. Section 1 is an introduction, serving to outline the

features, package types, and pin assignments of the MC145474/75. Section 2 describes the

various wiring configurations which are applicable to the MC145474/75, and the operational

distances as recommended by CCITT I.430 and ANSI T1.605. Section 3 addresses the activation

and deactivation procedures of the MC145474/75.

The MC145474 and MC145475 use the IDL. This is a four wire interface used for full duplex

communication between ICs on the board level. Two 64 kbps B channels and one 16 kbps D

channel are transmitted and received over this interface. Section 4 is a detailed description of the

IDL.

The MC145474 and MC145475 incorporate an SCP interface. The SCP is a four wire interface

conforming to an industry standard multi-drop serial link. The SCP is compatible with Motorola’s

serial peripheral interface (SPI). The SCP makes use of eight nibble registers and sixteen byte

registers. Section 5 is a description of the SCP. A per bit description of the nibble and byte registers

is as described in Sections 7 and 8, respectively. When the MC145474/75 is configured as a TE

it is equipped with five interrupt modes. When configured as an NT, it is also equipped with five

interrupt modes. Section 13 is a detailed description of all of these interrupts.

Section 6 contains pin descriptions of the MC145474 and the MC145475. The pin descriptions

differentiate between the device configured for NT mode or TE mode of operation.

As mentioned previously, the MC145474/75 is used for the transmission of two 64 kbps B channels

and one 16 kbps D channel. Access to the B channels is determined by the network. The TEs gain

access to the D channel in accordance with CCITT I.430 and ANSI T1.605 recommendations. A

description of the D channel operation is contained in Section 9.

MC145474 • MC145475

MOTOROLA

1-1

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