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XRT84L38 View Datasheet(PDF) - Exar Corporation

Part Name
Description
MFG CO.
XRT84L38
Exar
Exar Corporation Exar
'XRT84L38' PDF : 453 Pages View PDF
XRT84L38
OCTAL T1/E1/J1 FRAMER
REV. 1.0.1
Framing Select Register (FSR) - T1 Mode (Indirect Address = 0xn0H, 0x07H)
BIT 7
BIT 6
BIT 5
BIT 4
BIT3
BIT 2
BIT 1
BIT 0
Signaling
Update on
Super-frame
Boundary
CRC
Diagnostics
Select
J1 CRC
Calculation
One
Synchroniza-
tion
Candidate
Only
Fast
Synchroniza-
tion
T1 Framing
Select Bit 2
T1 Framing
Select Bit 1
T1 Framing
Select Bit 0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
1
0
0
0
BIT NUMBER
BIT NAME
7
Signaling Update on
Super-frame Boundary
6
CRC Diagnostics Select
BIT TYPE
BIT DESCRIPTION
R/W Signaling Update on Super-frame Boundary:
This READ/WRITE bit-field controls the framer to update signal-
ing data only on Super-frame boundaries.
The user can insert signaling data to the framer through the
TxSIG_n input pins or by writing into the Transmit Signaling Con-
trol Registers (TSCR).
When this bit is set to zero:
The framer will update signaling data once it is received. That is,
any value presents on the TxSIG_n pins or any value pro-
grammed to the TSCR will be inserted into the outgoing data
stream right away. Also, any changes on the TxSIG_n pins or
the TSCR will be instantaneously reflected on the outgoing data
stream.
When this bit is set to one:
The framer will only update signaling data on super-frame
boundaries. Any changes on the TxSIG_n pins or the TSCR will
be ignored until the next super-frame boundary is reached.
R/W CRC Diagnostics Select:
This READ/WRITE bit-field allows the user to insert CRC errors
into outgoing data stream. A transition from zero to one of this bit
will prompt the framer to invert the value of one CRC bit.
When this bit is set to zero:
The framer will operate normally and there is no insertion of erro-
neous CRC bit.
When this bit is set to one:
One CRC error will be inserted into the outgoing data stream
when this bit is transitioned from zero to one.
NOTE: To send another CRC error, the framer has to reset this
bit to zero and set it to one again.
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