XRT86VL32IB datasheet(65/154 Pages) EXAR

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XRT86VL3X

REV. 1.2.3

T1/E1/J1 FRAMER/LIU COMBO - ARCHITECTURE DESCRIPTION

7.0

THE E1 TRANSMIT/RECEIVE FRAMER

7.1

Description of the Transmit/Receive Payload Data Input Interface Block

Each framer within the XRT86VL3x device includes a Transmit and Receive Payload Data Input Interface

block. Although most configurations are independent for the Tx and Rx path, once E1 framing has been

selected, both the Tx and Rx must operate in E1. The Payload Data Input Interface module (also known as the

Back-plane Interface module) supports payload data to be taken from or presented to the system. In E1 mode,

supported data rates are 2.048Mbit/s, MVIP 2.048Mbit/s, 4.096Mbit/s, 8.192Mbit/s, multiplexed 16.384Mbit/s,

HMVIP 16.384Mbit/s, or H.100 16.384Mbit/s.

7.1.1

Brief Discussion of the Transmit/Receive Payload Data Input Interface Block Operating at

XRT84V24 Compatible 2.048Mbit/s mode

Whether or not the transmit/receive interface signals have been chosen as inputs or outputs, the overall

system timing diagrams remain the same. It is the responsibility of the Terminal Equipment to provide serial

input data through the TxSER pin aligned with the Transmit Single-frame Synchronization signal and the

Transmit Multi-frame Synchronization signal. Figure 61 shows how to connect the Transmit Payload Data

Input Interface block to local Terminal Equipment. Figure 62 shows how to connect the Receive Payload Data

Output Interface to local Terminal Equipment.

FIGURE 61. INTERFACING THE TRANSMIT PATH TO LOCAL TERMINAL EQUIPMENT

TxSERCLK0

TxSER0

TxMSYNC0

TxSYNC0

TxCHCLK0

TxCHN[4:0]_0

TxSERCLKn

TxSERn

TxMSYNCn

TxSYNCn

TxCHCLKn

TxCHN[4:0]_n

Transmit

Payload

Data Input

Interface

Chn 0

Transmit

Payload

Data Input

Interface

Chn N

Terminal

Equipment

XRT86VL3x

XRT86VL32IB Datasheet(PDF) 65 Page - Exar Corporation

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