[SI-LIST] SATA II Electrical Specification
- From: <Cortex.Chen@xxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Wed, 22 Feb 2006 15:07:50 +0800
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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