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.

Two-ways synchronizer (slow-to-fast and fast-to-slow)?

Status
Not open for further replies.

ivlsi

Advanced Member level 3
Joined
Feb 17, 2012
Messages
887
Helped
17
Reputation
32
Reaction score
16
Trophy points
1,298
Activity points
6,861
Hi All,

How to design a two-ways synchronizer, which would work for slow-to-fast as well as for fast-to-slow clock domains crossing?

Thank you!
 

harpv

Member level 4
Joined
May 30, 2012
Messages
71
Helped
19
Reputation
38
Reaction score
20
Trophy points
1,288
Activity points
1,823
A way to do this is to use handshaking as the mechanism for clock domain crossing. Handshake mechanism is independent of source and destination frequencies. Is this what you have in mind?
 

ads-ee

Super Moderator
Staff member
Joined
Sep 10, 2013
Messages
7,805
Helped
1,809
Reputation
3,628
Reaction score
1,768
Trophy points
1,393
Location
USA
Activity points
58,912
There is no generic method.

1. high speed signal that is active/inactive every clock cycle.
- use a FIFO

2. low speed level signal that transitions occasionally after many clock cycles (in destination domain).
- use a 2 FF synchronizer

3. pulse signal that has pulses spread multiple clock cycles apart (in destination domain).
- use a toggle synchronizer, (i.e. generate a toggle signal from the pulse followed by the 2 FF synchronizer)
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top