XRT84L38 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT84L38' PDF : 453 Pages View PDF
REV. 1.0.1
BIT NUMBER
BIT NAME
4
Synchronization Signal
Direction
3-2
Transmit Data Link
Source Select [1:0]
XRT84L38
OCTAL T1/E1/J1 FRAMER
BIT TYPE
BIT DESCRIPTION
R/W Synchronization Signal Direction:
This READ/WRITE bit-field determines the direction of transmit
synchronization signal (TxSync_n) and the Transmit Multi-frame
Synchronization signal (TxMSync_n). In H.100 interface mode,
this READ/WRITE bit-field determines the location of the trans-
mit synchronization pulse.
When this bit is set to zero:
The transmit synchronization signal is input if the Transmit Line
Clock Source Select bits of Clock Select Register (CSR) equal to
one. That is, if the Transmit Serial Input Clock (TxSerClk_n) is
configured as the source of the Transmit Line Clock.
If the Transmit Line Clock Source Select bits of Clock Select
Register (CSR) is not equal to one, the transmit synchronization
signal is output.
In H.100 interface mode, the transmit synchronization pulse
occurs at the last and the first clock cycles of each frame.
When this bit is set to one:
The transmit synchronization signal is output if the Transmit Line
Clock Source Select bits of Clock Select Register (CSR) equal to
one. That is, if the Transmit Serial Input Clock (TxSerClk_n) is
configured as the source of the Transmit Line Clock.
If the Transmit Line Clock Source Select bits of Clock Select
Register (CSR) is not equal to one, the transmit synchronization
signal is input.
In H.100 interface mode, the transmit synchronization pulse
occurs at the first two clock cycles of each frame.
R/W Transmit Data Link Source Select [1:0]:
These READ/WRITE bit-fields permits the user to determine
where the data link bits should be inserted from.
When these bits are set to 00:
The data link bits are inserted into the framer through the Trans-
mit Serial Data input Interface via the TxSer_n pins.
When these bits are set to 01:
The data link bits are inserted into the framer through the Trans-
mit HDLC Controller.
When these bits are set to 10:
The data link bits are inserted into the framer through the Trans-
mit Overhead Input Interface via the TxOH_n pins.
When these bits are set to 11:
The data link bits are inserted into the framer through the Trans-
mit Serial Data input Interface via the TxSer_n pins.
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