XRT84L38IB Exar Corporation, XRT84L38IB Datasheet - Page 86

• 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
Framing Select Register (FSR) - T1 Mode (Indirect Address = 0xn0H, 0x07H)
Super-frame
B
Update on
Boundary
Signaling
IT
B
R/W
N
IT
0
UMBER
7
6
7
Diagnostics
Signaling Update on
Super-frame Boundary
CRC Diagnostics Select
Select
B
CRC
R/W
IT
0
6
B
IT
N
AME
Calculation
J1 CRC
B
R/W
IT
0
5
B
Synchroniza-
IT
R/W
R/W
Candidate
T
YPE
B
Only
One
R/W
tion
IT
0
4
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.
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.
N
OTE
66
Synchroniza-
: To send another CRC error, the framer has to reset this
bit to zero and set it to one again.
B
Fast
R/W
tion
IT
1
3
T1 Framing
Select Bit 2
B
B
R/W
IT
IT
0
D
2
ESCRIPTION
T1 Framing
Select Bit 1
B
R/W
IT
0
1
T1 Framing
Select Bit 0
REV. 1.0.1
B
R/W
IT
0
0