GX3202 Datasheet, PDF(29/49 Page) Semtech Corporation – Crosspoint Switch with Trace Equalization and Output De-emphasis

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GX3202 Datasheet, PDF (29/49 Pages) Semtech Corporation – Crosspoint Switch with Trace Equalization and Output De-emphasis

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The incident data can be inverted before checking by setting the corresponding

RX0_INVERT_PRBS_IN or RX1_INVERT_PRBS_IN bit (address 0x803h[2:2] and

0x811h[2:2]) to '1'.

The number of words to be compared is selectable via the corresponding

RX0_PRBS_BER_TIME and RX1_PRBS_BER_TIME bits (registers 0x80Ah and

0x817h).

Table 4-9: Compared Words

RX0_PRBS_BER_TIME[3:0] (binary)

Number of words* compared (decimal)

0000

Infinite

0001

0010

0011

3277

0100

6554

0101

838861

0110

1677722

*NOTE: Each word is comprised of 10 bits, therefore the actual number of samples compared

is 10 times the number of words compared.

The status of the two pattern checking blocks is available in the RX0_PRBS_LOCK and

RX1_PRBS_LOCK, RX0_PRBS_PASS and RX1_PRBS_PASS, RX0_PRBS_FAIL and

RX1_PRBS_FAIL, and RX0_PRBS_ERROR_COUNT and RX1_PRBS_ERROR_COUNT

read-only bits (see register addresses 0x81Eh to 0x821h).

â¢ RX0_PRBS_LOCK [0] - When HIGH, indicates that the pattern checker has

acquired the pattern

â¢ RX0_PRBS_PASS [1] - When HIGH, indicates that the pattern was locked, and the

specified number of words have been compared with fewer detected errors than

specified by the RX0_PRBS_BER_THRESH parameter

â¢ RX0_PRBS_FAIL [2] - Indicates that the test terminated in a failure condition.

There are three possible failure conditions:

1. The pattern generator failed to lock in the number of attempts specified by

RX0_PRBS_LOCK_ATTEMPTS (in which case RX0_PRBS_LOCK would still be

'0').

2. The pattern generator locked, but over the period of time indicated by the

RX0_PRBS_LOL_TIME bits, a greater number of errors were detected than

allowed by the RX0_PRBS_LOL_THRESH setting. In this error condition, the

device determines that it has âlost lockâ, and terminates the test. This error

condition is detectable if both RX0_PRBS_LOCK and RX0_PRBS_FAIL bits are

HIGH, and the value of RX0_PRBS_ERROR_COUNT is less than

RX0_PRBS_BER_THRESH (the same applies for RX1_PRBS_LOCK,

RX1_PRBS_FAIL and RX1_PRBS_ERROR_COUNT).

GX3202 202 x 202 3.5Gb/s Crosspoint

Data Sheet

56077 - 1

October 2012

29 of 49

Proprietary & Confidential

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