Forum for Everyone Interested in Schematic & PCB Design

I setup a new forum for Electronic Enthusiastics & Professionals. It already has some interesting posts. I like this one about simulating CPU -> FLASH & SDRAM connection: SDR SDRAM layout recommendations.

The post is all about making decision on, how to place & route CPU + FLASH + SDRAM on one shared bus. Have a look at the simulations and notice the signal quality difference for different routing topology.

The worst case
Placing series termination resistor close to the CPU (U1, input, blue color), setting up MEMORY as Output (U2, green), routing all parts in one line (I did not actually placed the chips in one line, as there will be some tracks inside the package, so I made a small stub)

Click image for larger version

Name:	Simulation - R near CPU - Inline.png
Views:	1
Size:	102.9 KB
ID:	60
Click image for larger version

Name:	Simulation - R near CPU - Inline.png
Views:	1
Size:	135.8 KB
ID:	61

The optimum case
Placing series termination resistor close to the SDRAM, setting up MEMORY as Output (green color), routing all the branches same length

Click image for larger version

Name:	Simulation - R near MEM - Tbranch.png
Views:	1
Size:	161.8 KB
ID:	62
Click image for larger version

Name:	Simulation - R near MEM - Tbranch.png
Views:	1
Size:	132.4 KB
ID:	63

Read more at the forum: http://www.fedevel.com/designhelp/forum/test/pcb-layout/82-sdr-sdram-layout-recommendations

2 thoughts on “Forum for Everyone Interested in Schematic & PCB Design

  1. Hi Gurus,

    I’m a new one in this field and starting career as an intern, please suggest guidelines , tips , tricks for PCB designing , Schematics, Footprints etc. Moreover, started working on Altium (Designer & Vault) as well so please guide me on this front as well.

    Like

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s