
PRELIMINARY
XRT86SH328
277
REV. P1.0.6
28-CHANNEL DS1/E1 FRAMER/LIU WITH DS3 MUX & VT-MAPPER - SONET APPLICATIONS
BIT 0 - Unframed PRBS:
This READ/WRITE bit-field is used to configure the Transmit DS1 Framer block to generate and transmit either a framed
or unframed PRBS Pattern. Likewise, this bit-field also configures the corresponding Receive DS1 Framer block to
expect either a framed or unframed PRBS pattern.
`
0 = Transmit and Receive DS1 Framer block will handle framed PRBS Pattern.
`
1 = Transmit and Receive DS1 Framer block will handle unframed PRBS Pattern.
BIT7 - PRBS Type:
This READ/WRITE bit-field is used to specify the type of random pattern that the PRBS Generator and PRBS Receiver
will handle.
`
0 = A PRBS Pattern with the Polynomial of X^15 + X^14 + 1.
`
1 = A QRTS Pattern
BIT6 - Error Insert:
This READ/WRITE bit-field is used to configure the PRBS Generator to insert a single bit-error into the outbound PRBS
data-stream.
`
A 0 to 1 transition, within this bit-field causes the PRBS Generator to insert a single bit-error into the outbound PRBS
data-stream.
BIT 5 - Data Invert:
This READ/WRITE bit-field is used to (1) configure the PRBS Generator to invert all of its outbound traffic (as it
generates and transmits this data), and (2) configures the PRBS Receiver to invert all of the incoming PRBS pattern
data prior to processing.
`
0 = No Inversion by either the PRBS Generator or the PRBS Receiver
`
1 = Configures Inversion by both the PRBS Generator and PRBS Receiver
BIT 4 - Receive PRBS Lock:
This READ-ONLY bit-field indicates whether or not the PRBS Receiver is currently declaring PRBS Lock with the
incoming PRBS data-stream.
`
0 = PRBS Receiver is NOT currently declaring PRBS Lock.
`
1 = PRBS Receiver is CURRENTLY declaring PRBS Lock.
BIT 3 - Receive PRBS Detection/Generation Enable:
This READ/WRITE bit-field is used to either enable or disable the PRBS Receiver.
`
0 = Disables the PRBS Receiver
01
1 Erred bit per 1,000 bits is inserted
10
1 Erred bit per 1,000,000 bits is inserted
11
No Bit Error Inserted
T
ABLE
412: T1 F
RAMER
B
LOCK
- DS1 T
EST
R
EGISTER
- 1 (A
DDRESS
= 0
X
N123,
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
PRBS Type
Error Insert
Data Invert
Receive
PRBS Lock
Receive
PRBS
Enable
Transmit
PRBS
Enable
Receive DS1
By Pass
Transmit
DS1 By Pass
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
Resulting Errors Generated by the PRBS Generator
BER C
ONTROL
[1:0]
R
ESULTING
E
RRORS
G
ENERATED
BY
THE
PRBS G
ENERATOR