[SI-LIST] SATA II Electrical Specification

Dear Experts,
 

Recently I read the SATA spec, the min differential output voltage is defined 
400mV for all Gen1 & Gen2 types (i/m/x) that shocks me.

It means that trace length should be as short as possible for current project 
and long backplane is not long (interconnect loss budget is changed from 
9.275dB to 3.255 dB for 2x).   

Who can tell me the story/history of the electrical specification?

 

Note 1:

<Serial ATA II: Electrical Specification, rev. 1.0, page 44 & 47>

          1i     1m   1x     2i    2m    2x 

Min TX   400   500   800   400   500   800   mV

Min RX   325   240   275   275   240   275   mV

 

<Serial ATA Revision 2.5, page 135 & 138>

          1i     1m   1x     2i    2m    2x 

Min TX   400   400   400   400   400   400   mV

Min RX   325   240   275   275   240   275   mV

 

Note 2:

i: PC motherboard to device application

m: Short backplane and external desktop application

x: Long backplane and system-to-system application

 

Sincerely

 

    Cortex Chen    ³¯¥ÃªN

 

SI Section, ESBU

Quanta Computer Inc.

No. 211, Wen Hwa 2nd., Kuei Shan Hsiang,

Tao Yuan Shien, Taiwan.

TEL: 886-3-3272345 ext. 11710

FAX: 886-3-3973614

 


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