[SI-LIST] Re: return path
- From: "chrice102" <chrice102@xxxxxxxx>
- To: "steve weir" <weirsi@xxxxxxxxxx>
- Date: Tue, 8 Apr 2008 18:22:34 +0800
hi steve
thank you for your replies! in our motherboard system,the layers is S V G
S.and we route the command and control signals on TOP layer.so we have to split
vcc plane into vdd and gnd in ddr area.the DQ signal ref the gnd plane ,the
command and control signal ref the vdd .you said "Vdd reference on address /
control supports low cost PCBs.".this is the only reason?
2008-04-08
chrice102
·¢¼þÈË£º steve weir
·¢ËÍʱ¼ä£º 2008-04-08 16:37:51
ÊÕ¼þÈË£º chrice102
³ËÍ£º si-list@xxxxxxxxxxxxx
Ö÷Ì⣺ Re: [SI-LIST] return path
Vdd reference on address / control supports low cost PCBs.
ODT on common lines requires enabling in one chip only via control
registers. The address lines are used to access the control registers.
Steve.
chrice102 wrote:
> hi all
> I have some problems :In DDR system,the reference plane of ADDRS signals is
> Vddr,why isn't gnd plane? and why does the chip vendor also put the
> terminater of the ADDRS signal into the chip?
> 2008-04-08
>
>
>
> chrice102
>
>
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