We are using the PRBS Generator and Checker referring to the following but do not understand why the BER can be tested.
Serializer/Deserializer (SerDes) for KeyStone II Devices User Guide (Rev. A)
http://www.ti.com/lit/ug/spruho3a/spruho3a.pdf
19.1.5 Performing On-Chip Byte-Error Rate (BER) Testing (Page 151)
C:\ti\pdk_k2hk_4_0_7\packages\ti\diag\serdes_diag\test\k2h\c66\serdes_diag_test.c
In step 10, BIST_CHK_SYNCH is used to check successfully detected the PRBS data. I want to know more about the conditions when BIST_CHK_SYNCH is asserted.
Does BIST_CHK_SYNCH continue to be asserted while the PRBS pattern transmitted from the PRBS generator matches the correct polynomial?
Does BIST_CHK_SYNCH continue to be de-asserted while the pattern does not match?
In step 15, verifying that BIST_CHK_ERRORS is 0 verifies that no bit errors were measured during the testing sequence.
If BIST_CHK_ERRORS is nonzero, how can the BER be calculated?
Best regards,
Daisuke
