Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

USB ULPI signal routing on PCB

Status
Not open for further replies.
E

engr_joni_ee

Advanced Member level 3
Advanced Member level 3
Joined
Nov 3, 2018
Messages
822
Helped
2
Reputation
4
Reaction score
7
Trophy points
18
Activity points
6,874
I guess the typical signal speed on typical FR4 PCB is 15 cm / nanosecond. In 100 picosecond the travelling distance would be:

speed = 15 cm / nanosecond
or 15 cm / 1000 picosecond
or 1.5 cm / 100 picosecond
or 1.5 x 393.7 mil / 100 picosecond
or 590.55 mil / 100 picosecond

590.55 mil in 100 picosecond

I have found the following text from a reference document regarding delay which I guess has direct connection to length matching.

"USB ULPI
PCB and package delay should be kept to 2.0 ns or shorter to meet the 60 MHz operating
target. PCB and package delay skew for DATA[7:0], DIR, NXT, and STP should be less than
±100 ps."

How can I find the length match tolerance in thou from the above info.
 
Last edited:

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top