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8–6 Altera Corporation
Stratix GX Transceiver User Guide January 2005
Pattern Verifier
Be sure you do not use the rx_apllreset signal because the re-training
process of the CRU might cause false errors. A reference design is
included in “Design Examples” on page 8–7.
Incremental Mode Verifier
In the incremental mode, the BIST generator transmits the data pattern in
the following sequence: K28.5 (comma), K27.7 (SOF), Data (00-FF
incremental), K28.0, K28.1, K28.2, K28.3, K28.4, K28.6, K28.7, K23.7, K30.7,
K29.7 (EOF), and repeat.
The sync pattern on the receiver word aligner must be set to a K28.5
pattern (10'b0011111010) for proper synchronization between the
generator and verifier. As in the PRBS verification mode, the
synchronization is handled by a built-in state machine, so control of the
rx_enacdet signal is not required.
The BIST verifier waits for the word aligner to synchronize. After
synchronization, the BIST verifier checks for the following sequence:
K27.7 (SOF), Data (00-FF incremental), K28.0, K28.1, K28.2, K28.3, K28.4,
K28.6, K28.7, K23.7, K30.7, and K29.7 (EOF). If it does not see a K27.7
(SOF) within 31 patterns, the rx_errdetect and rx_bistdone signals
go high, and the verifier stops. The verifier checks for this sequence twice
before setting the rx_bistdone signal high. If any errors are detected
before the verifier finishes, the rx_errdetect and rx_bistdone
signals go high. Use the rxdigitalreset signal to restart the
incremental verification. Do not use the rx_apllreset signal because
the retraining process of the CRU might cause false errors. A reference
design is included in “Design Examples” on page 8–7.
Table 8–2 shows which loopback modes are supported for each
verification mode.
Table 8–2. Verification Modes
Verification Mode Comma Loopback Modes
2
8
-1
16'b1000000011111111
(A1A2 mode)
Serial or parallel
2
10
-1
10'b111111111
(10-bit mode)
Serial or parallel
Incremental 10'b0011111010
(10-bit mode)
Serial or parallel or post
8B/10B parallel
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