DP159 - Error Check Function

Hello Team,

It seems DP159 has "Error Check Function" regarding the below registers and description in page 29 in the datasheet.

If PRBS7 pattern is selected, does the device counts error for PRBS7 input signal ?

Could you please tell us how we can use this function ? Any restriction or certain programming procedures ?

* Customer is using in DisplayPort Retimer mode.

Best Regards,

Kawai

Hello Kawai-san,

BERTCNT is result of pattern verifier. DP159 can check for errors in PRBS pattern or 8b10b. Depending on mode, errors from all lanes are lumped into a single register or errors for each lane is individually counted into separate registers.

Here is a pattern generator uses guide for DP159.  

DP159_PATTERN_GENERATOR_USERS_GUIDE.pdf

Hello Joel-san,

[Q1]
Is this BERT_CNT available for DisplayPort Retimer mode ?

[Q2]
When using with PRBS7 data pattern, which registers would you need to program ? Please tell us the programming procedure.
I believe below registers are needed to be programmed.

ADDR 0x0E [3:0] PV_LD --> * Set to enable pattern verifier ? Is bit 0 assigned to Lane0 ? Should program last ?
ADDR 0x10 bit7 PV_CP20 --> * Does not matter for PRBS error check ?
ADDR 0x10 [5:0] PV_SEL --> Should select PRBS7, PRBS
ADDR 0x14 [2:0] PV_THR --> * What is this setting ?
ADDR 0x15 [2:0] TST_SEL --> * What is this setting ?
ADDR 0x16 [7:4] PV_DP_EN --> * Set to enable pattern verifier ? Is bit 0 assigned to Lane0 ? Should program last ?
ADDR 0x16 [2:0] DP_TST_SEL --> * Should keep default value for PRBS ?
ADDR 0x1x BERT_CNT --> Read for error counts.

Best Regards,
Kawai