XRT84L38IB Exar Corporation, XRT84L38IB Datasheet - Page 284

• Manufacturer Part Number: XRT84L38IB
• Description: Network Controller & Processor ICs 8 Ch T1/E1 Framer
• Manufacturer: Exar Corporation

Specifications of XRT84L38IB

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

XRT84L38
OCTAL T1/E1/J1 FRAMER
•
•
•
•
•
•
The Transmit Back-plane interface is still accepting data through TxSer_n at an E1 equivalent data rate of
2.048Mbit/s. However, the local Terminal Equipment supplies a free-running 8.192MHz clock to the Transmit
Input Clock pin of the framer. The local Terminal Equipment provides synchronized payload data at every other
four rising edge of the Transmit Input Clock. The Transmit High-speed Back-plane Interface of the framer then
latches incoming serial data at every other four falling edge of the clock.
The Transmit Single-frame Synchronization input signal (TxSync_n) should pulse HIGH at the beginning of the
256-bit frame indicating start of the frame. By sampling the HIGH pulse on the Transmit Single-frame
Synchronization signal, the framer can position the beginning of an E1 frame. It is responsibility of the local
Terminal Equipment to align the Transmit Single-frame Synchronization signal with serial data stream going
into the framer.
See
Interface block of the framer in 8.192Mbit/s mode.
F
IGURE
Data input (TxSer_n)
Transmit Serial Clock Input signal (TxSerClk_n)
Transmit Single-frame Synchronization Input signal (TxSync_n)
Transmit Input Clock (TxInClk_n)
Transmit Time-slot Indication clock (TxTSClk_n)
Transmit Time Slot indicator bits (TxTSb[4:0]_n)
Figure 73
73. I
NTERFACING
below for how to interface the local Terminal Equipment with the Transmit Payload Data Input
XRT84L38
Equipment
Terminal
TO LOCAL TERMINAL EQUIPMENT USING
TxSerClk_0
TxSer_0
TxInClk_0 (8.192MHz)
TxSync_0
TxSerClk_7
TxSer_7
TxInClk_7 (8.192MHz)
TxSync_7
264
Data Input
Data Input
Transmit
Interface
Transmit
Interface
Payload
Payload
Chn 0
Chn 7
XRT84L38
8.192M
BIT
/
S DATA BUS
REV. 1.0.1