SN65DSI84: DSI and LVDS length matching

Peter Szilagyi

Part Number: SN65DSI84

Dear TI technical support,

We have been using your SN65DSI84 chip for a while and as far as I understood DSI and LVDS differential pairs have to be matched within each other, not only the static phase of each individual pair, but all the pairs to each other as well (match group).

But since then I have seen on many monitor PCB-s that they don't care about matching the data lanes within each other, they can have different lengths and they only tune the static phase. Is this a correct approach, or am I supposed to match all the data lanes within each other (10 lanes in case of LVDS)?

Please, let me know your thoughts on this!

Greetings,
Péter Szilágyi (No Isolation AS.)

over 6 years ago

0 Ikechukwu Anyiam over 6 years ago

TI__Mastermind 35130 points

Hi Peter,

Your original understanding is correct. You should match the length of all data lanes. For example, a DSI pair should be the same length as another DSI pair, and an LVDS pair should be the same length as another LVDS pair. This is to minimize skew between the lanes and ensure error-free transmission.

Regards,
I.K.

0 Peter Szilagyi over 6 years ago in reply to Ikechukwu Anyiam

Prodigy 150 points

Hi Anyiam,

Thank you for the answer.

Do you know within what tolerance do they have to be matched? I know that the individual traces in the differential pairs have to be matched within 5 mil, but what about the lanes?

0 Ikechukwu Anyiam over 6 years ago in reply to Peter Szilagyi

TI__Mastermind 35130 points

5 mil tolerance should also be fine for the lanes.

Regards,
I.K.

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SN65DSI84: DSI and LVDS length matching