Pattern generator, Prbs mode generator, Pattern generator –2 – Altera Stratix GX Transceiver User Manual
Page 206: Figure 8–2. block diagram of bist modes, Incremental mode generator, High-frequency mode generator, Low-frequency mode generator, Mix-frequency mode generator
8–2
Altera Corporation
Stratix GX Transceiver User Guide
January 2005
Pattern Generator
Figure 8–2. Block Diagram of BIST Modes
Pattern
Generator
The BIST data generator supports the following pattern generators:
■
PRBS mode generator
■
Incremental mode generator
■
High-frequency mode generator
■
Low-frequency mode generator
■
Mix-frequency mode generator
PRBS Mode Generator
Pseudo-Random Bit Sequences (PRBS) are commonly used to verify the
integrity and robustness of the data transmission paths. The PRBS
generator is used in 8-, 16-, 10-, or 20-bit modes. In 8- or 16-bit data width
modes, the PRBS generator generates 2
8
-1 unique patterns. In 10- or 20-bit
data modes, the PRBS generator yields 2
10
lists the modes and their associated polynomials.
BIST MODES
PATTERN GENERATOR
(Transmitter)
PRBS
INCREMENTAL
HIGH
Frequency
PATTERN VERIFIER
(Receiver)
PRBS
10^
10
-1
PRBS
10^
8
-1
LOW
Frequency
MIX
Frequency
PRBS
PRBS
10^
10
-1
PRBS
10^
8
-1
INCREMENTAL
Table 8–1. BIST Generator PRBS Modes
Data Width
PRBS Mode
Polynomials
8-bit
2
8
-1
X
8
+ X
7
+ X
5
+ X
3
+ 1
10-bit
2
10
-1
X
10
+ X
7
+ 1
16-bit
2
8
-1
X
8
+ X
7
+ X
5
+ X
3
+ 1
20-bit
2
10
-1
X
10
+ X
7
+ 1