
PRELIMINARY
XRT86SH328
281
REV. P1.0.6
28-CHANNEL DS1/E1 FRAMER/LIU WITH DS3 MUX & VT-MAPPER - SONET APPLICATIONS
BIT [7:1] - Receive Loop-Back Deactivation Code[6:0]:
These seven (7) READ/WRITE bit-fields are used to specify/define one of the three possible loop-code pattern that the
Receive DS1 Framer block should respond to, and interpret as being the Loop-Down (or Loop-Back Deactivate) code.
N
OTES
:
1.
These READ/WRITE bit-fields are only active if BIT 0 (Receive Deactivation 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 "ode 0.
BIT 0 - Receive Deactivation 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
Deactivation Code detection for Code 0. If the user enables the Receive DS1 Framer block for Loop-Back Deactivation
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 Deactivation 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 Deactivation code.
`
1 = Configures the Receive DS1 Framer block to check the incoming DS1 data-stream for the presence of the Loop-
Back Deactivation code.
page 695 of word
Bits [7:6] - Receive Loop-Back Code Activation Length[1:0]:
These two READ/WRITE bit-fields permit the user to specify the length of the "loop-back activation" code that
the Receive DS1 Framer block will use (for Code 1), as depicted below in Table _.
T
ABLE
416: R
ECEIVE
T1 F
RAMER
B
LOCK
- R
ECEIVE
L
OOP
-B
ACK
D
EACTIVATION
C
ODE
R
EGISTER
- C
ODE
0
(A
DDRESS
= 0
X
N127,
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 Deactivation Code[6:0]
Receive
Deactivation
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
T
ABLE
417: T1 F
RAMER
B
LOCK
- L
OOP
-
BACK
C
ODE
C
ONTROL
R
EGISTER
- C
ODE
1 (A
DDRESS
= 0
X
N12A,
WHERE
N
RANGES
IN
VALUE
FROM
0
X
01
TO
0
X
38)
B
IT
7
B
IT
6
B
IT
5
B
IT
4
B
IT
3
B
IT
2
B
IT
1
B
IT
0
Receive Loop-Back Code
Activation Length[1:0]
Receive Loop-Back Code
Deactivation Length[1:0]
Unused
Framed
Loop-Back
Code
Unused
R/W
R/W
R/W
R/W
R/O
R/O
R/W
R/O
0
0
0
0
0
0
0
0