XRT84L38IB Exar Corporation, XRT84L38IB Datasheet - Page 271

• 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

REV. 1.0.1
supply an external free-running clock with frequency of 2.048MHz to the TxSerClk_n input pin. The Transmit
Single-frame Synchronization signal and the Transmit Multi-frame Synchronization signal are inputs to the
framer.
The Transmit Single-frame Synchronization signal should pulse HIGH for one E1 bit period (488ns) at the first
bit position of each E1 frame. By sampling the HIGH pulse on the Transmit Single-frame Synchronization
signal, the framer can position the beginning of an E1 frame.
The Transmit Multi-frame Synchronization signal should pulse HIGH for one E1 bit period (488ns) at the first bit
position of the first frame of an E1 multi-frame. By sampling the HIGH pulse on the Transmit Multi-frame
Synchronization signal, the framer can position the beginning of an E1 super-frame.
It is the responsibility of the Terminal Equipment to provide serial input data through the TxSer_n pin aligned
with the Transmit Single-frame Synchronization signal and the Transmit Multi-frame Synchronization signal.
See
Equipment with the Transmit Serial clock being the timing source of transmit section.
F
S
IGURE
OURCE
Figure 63
63. I
NTERFACING
below for how to connect the Transmit Payload Data Input Interface block to the local Terminal
XRT84L38
Equipment
Terminal
TO LOCAL TERMINAL EQUIPMENT WITH
TxSerClk_7
TxSer_7
TxMSync_7
TxSync_7
TxTSClk_7
TxTSb[4:0]_7
TxSerClk_0
TxSer_0
TxMSync_0
TxSync_0
TxTSClk_0
TxTSb[4:0]_0
251
Data Input
Data Input
Transmit
Interface
Transmit
Interface
Payload
Payload
Chn 0
Chn 7
XRT84L38
T
X
S
ER
C
OCTAL T1/E1/J1 FRAMER
LK
_
N AS
T
RANSMIT
XRT84L38
T
IMING