
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
-1 unique patterns. Table 8–1
lists the modes and their associated polynomials.
BIST MODES
PATTERN GENERATOR
(Transmitter)
PRBSINCREMENTAL
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
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