
XRT86SH328
PRELIMINARY
280
28-CHANNEL DS1/E1 FRAMER/LIU WITH DS3 MUX & VT-MAPPER - SONET APPLICATIONS
REV. P1.0.6
BIT [7:1] - Transmit Loop-back Code[6:0]:
These READ/WRITE bit-fields is used to specify the loop-back code that the Transmit DS1 Framer block will transmit
(to the remote terminal equipment) whenever the user commands it to do so by setting BIT 0 (Transmit Loop-Back Code
Enable) to 1, within this register.
BIT 0 - Transmit Loop-back Code Enable:
This READ/WRITE bit-field is used to command the Transmit DS1 Framer block to transmit the Loop-back
Code (which has been written into Bits 7 through 1, within this register) to the remote terminal.
`
0 = Configures the Transmit DS1 Framer block to NOT transmit the Loop-back Code to the remote terminal
equipment.
`
1 = Configures the Transmit DS1 Framer block to transmit the Loop-back code to the remote terminal equipment.
N
OTE
:
The Transmit DS1 Framer block will repeatedly transmit the loop-back code for the duration that this bit-field is
set to 1.
BIT [7:1] - Receive Loop-Back Activation Code[6:0]:
These seven (7) READ/WRITE bit-fields are used to specify/define one of the threee possible loop-code patterns that
the Receive DS1 Framer block should respond to, and interpret as being the Loop-Up (or Loop-Back Activate) code.
N
OTES
:
1.
These READ/WRITE bit-fields are only active if BIT 0 (Receive Activation Loop-Back Code Detect Enable) has
been set to 1.
2.
The Receive DS1/E1 Framer block can be configured to detect three different loop activate/deactivate codes in
parallel. These three (3) codes will be referred to as "Code 0", "Code 1" and "Code 2" within this document. This
particular register applies to "Code 0".
BIT 0 - Receive Activation Loop-Back Code Detect Enable:
This READ/WRITE bit-field is used to either enable or disable the Receive DS1 Framer block for Loop-Back Activation
Code detection for Code 0. If the user enables the Receive DS1 Framer block for Loop-Back Activation Code detection
for Code 0, then the Receive DS1 Framer block (as it is receiving its incoming DS1 data-stream) will also begin to check
the incoming DS1 data-stream for the presence of the Loop-Back Activation Code (which has been defined in Bits 7
through 1 within this particular register).
`
0 = Configures the Receive DS1 Framer block to NOT check the incoming DS1 data-stream for the presence of the
Loop-Back Activation code.
`
1 = Configures the Receive DS1 Framer block to check the incoming DS1 data-stream for the presence of the Loop-
Back Activation code.
T
ABLE
415: R
ECEIVE
T1 F
RAMER
B
LOCK
- R
ECEIVE
L
OOP
-
BACK
A
CTIVATION
C
ODE
R
EGISTER
- C
ODE
0 (A
DDRESS
= 0
X
N126,
WHERE
N
RANGES
IN
VALUE
FROM
0
X
01
TO
0
X
38)
BIT7
BIT6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Receive Loop-Back Activation Code[6:0]
Receive Acti-
vation Loop-
Back Code
Detect
Enable
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
1
0
1
0
1
0
1
0