HC4GX15 Datasheet, PDF (450/668 Pages) Altera Corporation – HardCopy IV Device Handbook

1–186
Chapter 1: HardCopy IV GX Transceiver Architecture
Built-In Self Test MODES
Different PRBS patterns are available as a subprotocol under Basic functional mode
for single-width and double-width mode, as shown in the following sections.
You can enable the serial loopback option in Basic PRBS mode to loop the generated
pattern to the receiver channel. This creates a rx_seriallpbken port that you can
use to dynamically control the serial loopback. The 8B/10B encoder/decoder blocks
are bypassed in Basic PRBS mode.
Figure 1–155 shows the datapath for the PRBS patterns. The generated PRBS pattern is
sent to the transmitter serializer. The verifier checks the data from the word aligner.
Figure 1–155. BIST PRBS, High Frequency, and Low Frequency Pattern Datapath
Core
Fabric
TX
Phase
Compen-
sation
FIFO
Byte
Serializer
BIST PRBS, High-Freq,
Low-Freg pattern
generator
Transmitter Channel PCS ^{Transmitter Channel PMA}
8B/10B
Encoder
Serializer
Receiver Channel PCS
BIST PRBS verifier
Serial loop back
can be dynamically enabled
Receiver Channel
PMA
RX
Phase
Compen-
sation
FIFO
Byte
Ordering
Byte
De-
serializer
8B/10B
Decoder
Rate
Match
FIFO
Deskew
FIFO
Word
Aligner
De-
serializer
Receiver
CDR
PRBS in Single-Width Mode
Table 1–52 shows various PRBS patterns and corresponding word alignment patterns
for PRBS in single-width mode configuration.
Table 1–52. Available PRBS, High Frequency, and Low Frequency Patterns in Single-Width Mode (Part 1 of 2)
Patterns
Polynomial
PRBS 7
X⁷ + X⁶ + 1
PRBS 8
X⁸ + X⁷ + 1
PRBS 10
X¹⁰ + X⁷ + 1
PRBS 23
X²³ + X¹⁸ + 1
High
1010101010
frequency (2)
Channel
Width 8 Bit
(1)
Y
Y
N
Y
Y
Word
Alignment
Pattern with
Channel
Width 8 Bit
16’h3040
16’hFF5A
—
16’hFFFF
—
Maximum
Data Rate
With
Channel
Width 8 Bit
(Gbps)
2.5
2.5
N/A
2.5
2.5
Channel
Width 10 Bit
(1)
N
N
Y
N
Y
Word
Alignment
Pattern
—
—
10’h3FF
—
—
Maximum
Data Rate
with
Channel
Width 10 Bit
(Gbps)
—
—
3.125
—
3.125
HardCopy IV Device Handbook Volume 3
© June 2009 Altera Corporation