SATA cable

Are they twisted-pair?

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"Man-wai Chang ToDie (33.6k)" wrote:
>
> Are they twisted-pair?

No. From the .pdf obtainable via the "click here" at the bottom
of the web page at http://www.sata-io.org/satatechnology.asp:

"Serial ATA - 4-wire cable with support for optional shield / drain wires

"Serial ATA uses a minimum 4-wire cable that includes differential pairs
for transmitting and receiving data. To minimize impedance and crosstalk,
many cables incorporate additional shielding ground drain lines which
function similarly to the 40 interspersed ground lines in the 80-pin
Ultra ATA cable. The Serial ATA connector supports 3 independent
ground return paths. Serial ATA cables are specified to be at max
1m in length."

"Serial ATA - 7-pin custom connector

"The 0.5" wide cable connector directly connects the 4 signal wires
and 3 ground lines to the receiving terminal in a single row. Because
the connector includes the shielding ground pins, very little crosstalk
is introduced. Note that the receiving terminal uses extended
connectors for the 3 ground signals so that the ground reference
between the device and host can be shared prior to signals being
applied at the input. A similar mating sequence is enforced with the
new 7/8" wide 15-pin single row power connector. This feature is
necessary to accommodate hot-plugging."


This was all immediately available via Google.com . Short one-line
inquiries showing no attempt at all to find out for oneself are the hallmark
of a troll and/or loneliness. Seek help.

*TimDaniels*

> This was all immediately available via Google.com . Short one-line
> inquiries showing no attempt at all to find out for oneself are the hallmark
> of a troll and/or loneliness. Seek help.

I expected a short answer from a experienced person, not a
long thesis. Anyway, thanks, Your Honor.

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? ? (CSSA):
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Man-wai Chang ToDie (33.6k) wrote:
>
> Are they twisted-pair?
>
No

SATA Data pinout
SATA PinOut, Data Pin # Signal Name Signal Description
1 GND Ground
2 A+ Transmit +
3 A- Transmit -
4 GND Ground
5 B- Receive -
6 B+ Receive +
7 GND Ground

SATA Power pinout
SATA PinOut, Power Pin # Signal Name Signal Description
1 V33 3.3v Power
2 V33 3.3v Power
3 V33 3.3v Power, Pre-charge, 2nd mate
4 Ground 1st Mate
5 Ground 2nd Mate
6 Ground 3rd Mate
7 V5 5v Power, pre-charge, 2nd mate
8 V5 5v Power
9 V5 5v Power
10 Ground 2nd Mate
11 Reserved -
12 Ground 1st Mate
13 V12 12v Power, Pre-charge, 2nd mate
14 V12 12v Power
15 V12 12v Power

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Claude Hopper

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