ZL50060 ZARLINK [Zarlink Semiconductor Inc], ZL50060 Datasheet - Page 45

• Manufacturer Part Number: ZL50060
• Description: 16 K-Channel Digital Switch with High Jitter Tolerance, Per Stream Rate Conversion (2, 4, 8, 16, or 32 Mbps), and 64 Inputs and 64 Outputs
• Manufacturer: ZARLINK [Zarlink Semiconductor Inc]

6.0
Independent Bit Error Rate (BER) testers are provided for the Local and Backplane ports. In both ports there is a
BER transmitter and a BER receiver. The transmitter and receiver are each independently controlled to allow
Backplane-to-Backplane, Local-to-Local, Backplane-to-Local or Local-to-Backplane testing. The transmitter
generates a 2
and number of channels. This is defined by a stream number, a start channel number, and the number of
consecutive channels following the start channel. The stream, channel number and the number of consecutive
channels following the start channel are similarly allocated for the receiver and detection of the PRBS. Examples of
a channel sequence are presented in Figure 21.
When enabled, the receiver attempts to lock to the PRBS on the incoming bit stream. Once lock is achieved, by
detection of a seed value, a bit-by-bit comparison takes place and each error will increment a 16-bit counter. A
counter saturation to FFFF
The BER operations are controlled by registers as follows (refer to Section 14.3, Bit Error Rate Test Control
Register (BERCR) for overall control, Section 14.10, Local Bit Error Rate (BER) Registers and Section 14.11,
Backplane Bit Error Rate (BER) Registers for register programming details):
•
•
•
•
•
•
The registers listed completely define the transmit and receive stream and channels. When BER transmission is
enabled for these channels, the source bits and the Message Mode bits, LSRC and LMM in the Local Connection
Memory, and BSRC and BMM in the Backplane Connection Memory, are ignored. The per-channel enable bits (LE
BER Control Register (BERCR) - Independently enables BER transmission and receive testing for
Backplane and Local ports.
Local and Backplane BER Start Send Registers (LBSSR and BBSSR) - Define the output stream and start
channel for BER transmission.
Local and Backplane Transmit BER Length Registers (LTXBLR and BTXBLR) - Define, for transmit stream,
how many consecutive channels to follow the start channel.
Local and Backplane BER Start Receive Registers (LBSR and BBSR) - Define the input stream and channel
from which the BER sequence will start to be compared.
Local and Backplane Receive BER Length Registers (LRXBLR and BRXBLR) - Define, for the receive
stream, how many consecutive channels to follow the start channel.
Local and Backplane BER Count Registers (LBCR and BBCR) - Contain the number of counted errors.
Total Length = 256 Channels
Bit Error Rate Test
Total Length = 3 Channels
Total Length = 4 Channels
L/BXTR8-0=000000011
L/BXTR8-0=000000001
L/BTXB8-0=111111111
Figure 21 - Examples of BER Transmission Channels on a 16Mbps Output Stream
15
-1 or 2
Note: Total Length = Number of Consecutive Channels Desired Programmed in L/BTXR8-0 - 1 Channel
Start Ch=254
Start Ch=0
Start Ch=0
FP8i
23
Once started, BER transmission continues until stopped by the BER Control Register.
-1 Pseudo Random Binary Sequence (PRBS), which may be allocated to a specific stream
B
B
H
B
Channels containing PRBS sequence
occurs in the event of an error count in excess of 65,535.
0
0
0
frame boundary
1
1
1
2
2
2
Zarlink Semiconductor Inc.
3
3
3
ZL50060/1
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......
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45
.....
.....
.....
.....
.....
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254
254
254
Channels containing unknown data
255
255
255
0
0
0
1
1
1
2
2
2
Data Sheet