XRT84L38IB Exar Corporation, XRT84L38IB Datasheet - Page 310

• 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
(This interface mode is the same as running at 2.048 MHz. The only difference is that the Receive Serial Clock
runs two times faster at 4.096 MHz)
When the Receive Multiplex Enable bit is set to zero and the Receive Interface Mode Select [1:0] bits are set to
10, the Receive Back-plane interface of framer is running at a clock rate of 4.096MHz.
The interface consists of the following pins:
•
•
•
•
•
•
The Receive Back-plane interface is pumping out data through RxSer_n at an E1 equivalent data rate of
2.048Mbit/s. The local Terminal Equipment supplies a free-running 4.096MHz clock to the Receive Serial
Clock input. The Receive High-speed Back-plane Interface of the framer then sends out serial data at every
other rising edge of the Receive Serial Clock. The local Terminal Equipment samples the serial data at every
other falling edge of the clock.
The Receive Single-frame Synchronization input signal (RxSync_n) should pulse HIGH at the beginning of the
256-bit frame indicating start of the frame. By sampling the HIGH pulse of the Receive Single-frame
Synchronization signal, the framer can identity the beginning of an E1 frame and start pumping payload data
out.
See
Interface block of the framer in 4.096Mbit/s mode.
F
6.2.3.2
IGURE
Data input (RxSer_n)
Receive Serial Clock Input signal (RxSerClk_n)
Receive Single-frame Synchronization Input signal (RxSync_n)
Receive Input Clock (RxInClk_n)
Receive Time-slot Indication clock (RxTSClk_n)
Receive Time Slot indicator bits (RxTSb[4:0]_n)
Figure 89
89. I
NTERFACING
E1 Receive Input Interface - 4.096 MHz
below for how to interface the local Terminal Equipment with the Receive Payload Data Output
Equipment
XRT84L38
Terminal
TO LOCAL TERMINAL EQUIPMENT USING
RxSerClk_0 (4.096MHz)
RxSer_0
RxMSync_0
RxSync_0
RxSerClk_7 (4.096MHz)
RxSer_7
RxMSync
RxSync_7
290
Data Input
Data Input
Interface
Interface
Receive
Payload
Receive
Payload
Chn 0
Chn 7
XRT84L38
4.096M
BIT
/
S DATA BUS
REV. 1.0.1