SATA&SAS ReDriver Application
Guide
FAE Training
Lingsan Quan
Application Manager
lquan@pericom.com
Aug, 11 2011
For Internal Use only
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Copyright Pericom Semiconductor 2007
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Why ReDriver is Required
Signal degradation
 Long Cable or Long PCB Trace
 Connector
 VIA
Connector
Connector
VIA
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Application Sample1_ReDriver on NB Docking
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Application Sample2_ReDriver on Mid-plane Brd
2pcs PI2EQX6804-A in series
on one Mid-plane Board: U1&U8
U1
Trace length: about 16inch
between U1 and U8
Trace length: 7~9inch
between U8 and Intel
Chipset
Trace length: 2~5inch
between U1 and HDD
12 HDDs
connected to
Backplane
U8
Intel Romley Platform
Total 4pcs mid-plane boards with 4pcs MB in one system
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What ReDriver can not help to do
Reflection
 PCB Stub issue
By-pass resistor
Stub issue on Layout
Connector
Connector
VIA
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How to Add by-pass Circuit for ReDriver
By-Pass Layout
Not Good
Better for co-layout
to decrease the Stub
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Layout Guide1
Layout Considerations for Differential Pairs
1.The trace length miss-matching shall be less than 5 mils for the
“+” and “–“ traces in the same pairs
2.Use wider trace width, with 100ohm differential impedance, to
minimize the loss for long routes
3.Target differential Zo of 100ohm ±20%
4.More pair-to-pair spacing for minimal crosstalk coupling, it is
recommended to have >3X gap spacing between differential pairs.
5.It is preferable to route differential lines exclusively on one layer
of the board, particularly for the input traces
6.The use of vias should be avoided if possible, if vias must be
used, they should be used sparingly and must be placed
symmetrically for each side of a given differential pair.
7.Route the differential signals away from other signals and noise
sources on the printed circuit board
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Layout Guide2
 PCB layout trace routing
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How to Apply Redriver’s Equalization, Swing
and Emphasis
Non Transition Eye
Transition Eye
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Pericom SATA/SAS Redriver Products_1
One-Lane ReDriver: PI3EQX6701C/D/E, same PINOUT
They have main difference as below, and have the same Swing
and Emphasis control. They can work at 1.2V or 2.5V~3.3V power.
PI3EQX6701C
PI3EQX6701D
PI3EQX6701E
Low
1dB
7dB
1dB
High
4dB
11dB
4dB
Low
1dB
7dB
7dB
High
4dB
11dB
11dB
Short trace
(<12inch) or cable
(<50cm)
at input of
Channel A&B
Long trace
(<30inch) or cable
(<1m)
at input of
Channel A&B
A_EQ
B_EQ
Application Selection
Short trace or
cable
at input of
Channel A
Long trace or
cable at input of
Channel B
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Pericom SATA/SAS Redriver Products_2
One-Lane ReDriver: PI3EQX6741ST/STB, PI2EQX6741SL
PI3EQX6741ST and PI2EQX6741SL have the difference at power
consumption, but they have same pinout, PI3EQX6741STB. Is
compatible with TI-SN75LVCP412-A.
PI2EQX6741SL
Voltage
Active
Power
Power(max.)
Consum
ption
Slumber mode
Standby
Application Selection
PI3EQX6741ST
PI3EQX6741STB
1.05V
+3.3V
104.5mW
342mW
15.4mW
50mW
1.1mW
3.6mW
NB, docking
Sever
Storage
Desktop
They have Termination Detect Feature for HDD unplug
lower power consumption as slumber mode.
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Pericom SATA/SAS Redriver Products_3
Four-Lane ReDriver: PI2EQX6804-A, PI2EQX6864-A
PI2EQX6804-A and PI2EQX6864-A have the difference at setting control,
and they also have different Pinout.
Setting
Control
PI2EQX6804-A
PI2EQX6864-A
Pin strap Control
Y
N
I2C Control
Y
Y
100-contact LFBGA
56-contact TQFN
Pinout
For PI2EQX6864-A, pin strap control only has
few step and is not suitable for real application.
For I2C control, two parts have all the settings
available, but they’re effective at the same time
for four lanes.
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Pericom SATA/SAS Redriver Products_4
In the Next, we’ll have…
 One-Lane ReDriver:
PI2EQX6811, with pin strap and I2C control
 Two-Lane ReDriver:
PI2EQX6812, with I2C control
 Four-Lane ReDriver:
PI2EQX6874, with I2C control for EACH channel
PI2EQX6814, with I2C control for EACH channel
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Application Feature in PI3EQX6741Sx Parts
 Termination Detect Feature_1
PI3EQX6741Sx
Waveform in the right is
measured at single output
of PI3EQX6741Sx before AC
capacitors.
It means there is no
termination at Host or
Device side.
Note:
1, PI3EQX6741Sx has termination detect feature to decrease power
consumption when external HDD is unplugged, . When external HDD is
unplugged, the “HDD unplugged” current is only about 1.1mA. And when
external HDD is plugged in, PI3EQX6741Sx can auto-wakeup for normal
working.
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Application Feature in PI3EQX6741Sx Parts
 Termination Detect Feature_2
When HDD is plugged
Waveform in the right is
measured at differential
output of PI3EQX6741Sx and
Tdet_A# output.
It means there is termination
at Host or Device side (HDD
or Host is plugged)
SATA Signal Output
Tdet_A# Output
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I2C sequence in PI2EQX68x4-A Parts
 I2C Write Sequence
There is ONE dummy byte to be added
Waveform in the right is
measured at differential
output of PI3EQX6741Sx and
Tdet_A# output.
It means there is termination
C0
at Host or Device side (HDD
This is one sample for Write sequence ator
Address=C0
(A4, A1, A0 are
Host is plugged)
pulled down) and Data byte[0..11]=00,00,F0,00,00,FF,FF,FF,00,00,00,EF.
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I2C sequence in PI2EQX68x4-A Parts
 I2C Read Sequence
There is NO dummy byte.
C1
This is one sample for Read sequence at Address=C1 (A4, A1, A0 are
pulled down) and Data byte[0..11]=08,00,F0,00,00,FF,FF,FF,00,00,00,EF.
Note: Byte0=08 means Channel-A2 has signal input.
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Interop_UnifiedTest Update_1
 OOB Signaling
Host COMRESET
Host COMWAKE
1st OOB Burst
Device
COMRESET
Device
COMWAKE
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Interop_UnifiedTest Update_2
 OOB Signal Burst Requirement
PASS Criteria
Fail Criteria
PASS/FAIL criteria information
in SATA Compliance Test Spec-UTD1.4.01.
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Interop_UnifiedTest Update_3
 1st OOB Burst Signal
Pericom Part
Competitor
ReDriver Input
ReDriver Output
Note:
1, Competitor has 1st OOB Burst distortion issue, it just has 64.7nS
length. According to SATA compliance test spec (UTD 1.4.01), the OOB
burst length shall be at the range of 103.5~110.9nS. So it will be fail in
Compliance test
2, PI3EQX6741Sx has BETTER 1st OOB burst length which is 103.6nS.
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Interop_UnifiedTest Update_4
 Differential Output Voltage for SATA G1&G2
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It will be no problem in SATA compliance test
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Interop_UnifiedTest Update_5
 Differential Output Voltage for SATA G3
Fail
PASS
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Q&A
Thanks
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