XRT86L30
REV. 1.0.1
SINGLE T1/E1/J1 FRAMER/LIU COMBO
11.0 THE DS1 TRANSMIT/RECEIVE FRAMER
11.1 Description of the Transmit/Receive Payload Data Input Interface Block
Each of the four framers within the XRT86L30 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.
11.1.1
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 79 shows how to connect the Transmit Payload Data
Input Interface block to local Terminal Equipment. Figure 80 shows how to connect the Receive Payload Data
Output Interface to local Terminal Equipment.
FIGURE 79. INTERFACING THE TRANSMIT PATH TO LOCAL TERMINAL EQUIPMENT
XRT86L30
TxSERCLK0
TxSER0
Transmit
Payload
Data Input
Interface
Chn 0
TxMSYNC0
TxSYNC0
TxCHCLK0
TxCHN[4:0]_0
Terminal
Equipment
208
EXAR [ EXAR CORPORATION ]
