XRT91L80ES Exar, XRT91L80ES Datasheet - Page 39

• Manufacturer Part Number: XRT91L80ES
• Description: Bus Transceivers Transceiver
• Manufacturer: Exar

Specifications of XRT91L80ES

• Product Category: Bus Transceivers
• Rohs: yes

XRT91L80
2.488/2.666 GBPS STS-48/STM-16 SONET/SDH TRANSCEIVER
B
D5
D4
D3
D2
D1
D0
IT
Reserved
Reserved
Reserved
RLOOPS
RLOOPP
DLOOP
N
AME
This Register Bit is Not Used
This Register Bit is Not Used
This Register Bit is Not Used
Digital Local Loopback
Digital local loopback allows the transmit input pins to be looped
back to the receive output pins for local diagnostics. The transmit
serial data output is valid during the digital loopback.
"0" = Disabled
"1" = Enable Digital Local Loopback
N
Serial Remote Loopback
Serial remote loopback allows the receive serial input pins to be
looped back to the transmit serial output pins for remote diagnos-
tics. The receive data output is valid during a serial remote loop-
back.
"0" = Disabled
"1" = Enable Remote Serial Loopback
N
Parallel Remote Loopback
Parallel remote loopback has the same affect as the serial remote
loopback, except that the data input is allowed to pass through the
SIPO before it’s looped back to the transmit path, wherein it
passes through the transmit FIFO, through the PISO, and back out
the transmit serial output. The receive data output is valid during a
parallel remote loopback.
"0" = Disabled
"1" = Enable Remote Parallel Loopback
N
OTE
OTE
OTE
: DLOOP and RLOOPS can be enabled simultaneously to
: DLOOP and RLOOPS can be enabled simultaneously to
: DLOOP and RLOOPS should be disabled when RLOOPP
achieve a dual loopback diagnostic feature.
achieve a dual loopback diagnostic feature.
is enabled. The internal FIFO should also be flushed using
FIFO_RST when parallel remote loopback is enabled/
disabled.
D
IAGNOSTIC
C
ONTROL
F
UNCTION
36
R
EGISTER
(0
X
05
H
)
Register
Type
R/W
R/W
R/W
X
X
X
xr
xr
xr
xr
(HW reset)
REV. 1.0.0
Default
Value
X
X
X
0
0
0