DS3174 Maxim Integrated Products, DS3174 Datasheet - Page 107
DS3174
Manufacturer Part Number
DS3174
Description
IC QUAD DS3/E3 TXRX 400-PBGA
Manufacturer
Maxim Integrated Products
Datasheet
1.DS3171N.pdf
(234 pages)
Specifications of DS3174
Function
Single-Chip Transceiver
Interface
DS3, E3
Number Of Circuits
4
Voltage - Supply
3.135 V ~ 3.465 V
Current - Supply
725mA
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
400-BGA
Includes
DS3 Framers, E3 Framers, HDLC Controller, On-Chip BERTs
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power (watts)
-
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Immediately after a reset (or datapath reset) or a LOS condition, a BPV will not be declared when the first valid one
(RPOS high and RNEG low, or RPOS low and RNEG high) is received. Bipolar to unipolar conversion converts the
AMI bipolar data into a unipolar signal by ORing together the RXP and RXN signals.
10.11 BERT
10.11.1 General Description
The BERT is a software programmable test pattern generator and monitor capable of meeting most error
performance requirements for digital transmission equipment. It will generate and synchronize to pseudo-random
patterns with a generation polynomial of the form x
repetitive patterns of any length up to 32 bits.
The transmit direction generates the programmable test pattern, and inserts the test pattern payload into the data
stream.
The receive direction extracts the test pattern payload from the receive data stream, and monitors the test pattern
payload for the programmable test pattern. See
DS3174x devices.
Figure 10-28. BERT Block Diagram
10.11.2 Features
•
•
•
•
•
10.11.3 Configuration and Monitoring
Set PORT.CR1.BENA = 1 to enable the BERT. The BERT must be enabled before the pattern is loaded for the
pattern load operation to take affect.
The following tables show how to configure the on-board BERT to send and receive common patterns.
Clock Rate
Programmable PRBS pattern – The Pseudo Random Bit Sequence (PRBS) polynomial (x
are programmable (length n = 1 to 32, tap y = 1 to n - 1, and seed = 0 to 2
Programmable repetitive pattern – The repetitive pattern length and pattern are programmable (the length n
= 1 to 32 and pattern = 0 to 2
24-bit error count and 32-bit bit count registers
Programmable bit error insertion – Errors can be inserted individually, on a pin transition, or at a specific
rate. The rate 1/10
Pattern synchronization at a 10
random Bit Error Rate (BER) of 10
Receive
Transmit
DS3/E3
DS3/E3
Adapter
LIU
LIU
Encoder
Decoder
B3ZS/
HDB3
HDB3
B3ZS/
n
is programmable (n = 1 to 7).
TUA1
TAIS
n
- 1).
IEEE P1149.1
Access Port
JTAG Test
FEAC
-3
-3
.
BER – Pattern synchronization will be achieved even in the presence of a
DS3 / E3
DS3 / E3
Receive
Framer
Transmit
Formatter
Buffer
Trace
Trail
HDLC
n
Figure 10-28
+ x
GEN
UA1
y
107
+ 1, where n and y can take on values from 1 to 32 and to
for the location of the BERT Block within the
n
RX BERT
TX BERT
- 1).
Microprocessor
Interface
n
+ x
y
+ 1) and seed
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