XRT86VL32IB datasheet(78/154 Pages) EXAR

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XRT86VL3X

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

REV. 1.2.3

8.0

THE DS1 TRANSMIT/RECEIVE FRAMER

8.1

Description of the Transmit/Receive Payload Data Input Interface Block

Each of the four framers 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 T1 framing has

been selected, both the Tx and Rx must operate in T1. 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 T1

modes, supported data rates are 1.544Mbit/s, MVIP 2.048Mbit/s, 4.096Mbit/s, 8.192Mbit/s, multiplexed

12.352Mbit/s, 16.384Mbit/s, HMVIP 16.384Mbit/s, or H.100 16.384Mbit/s.

8.1.1

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

1.544Mbit/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 77 shows how to connect the Transmit Payload Data

Input Interface block to local Terminal Equipment. Figure 78 shows how to connect the Receive Payload Data

Output Interface to local Terminal Equipment.

FIGURE 77. 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) 78 Page - Exar Corporation

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