One Stop Systems OSS-PCIe-4U-EXP-2022-400 User manual

User Manual,
4U Expansion System
(OSS-PCIe-4U-EXP-2022-400)

One Stop Systems OSS-PCIe-4U-EXP-2022-400
Page 2
Table of Contents
1. Overview
1.a. Description..........................................................................................................................................3
2. Component Identification
2.a. Host cable adapter..............................................................................................................................4
2.b. Expansion link board...........................................................................................................................4
2.c. Host cable adapter specifications........................................................................................................5
2.d. Expansion link board specifications.....................................................................................................5
3. Installation Instructions
3.a. Installing the adapter kit ......................................................................................................................6
3.b. Using with the 2-slot backplane...........................................................................................................6
3.c. Removing PCIe cable..........................................................................................................................6
4. Technical Information
4.a. Host adapter card switch settings........................................................................................................7
4.b. Host cable adapter LEDs ....................................................................................................................8
4.c. Pin assignments..................................................................................................................................9
4.d. PCI Express x4 Connector Pin Assignment........................................................................................10
4.e. Signal descriptions..............................................................................................................................12
4.f. Expansion link board switch settings....................................................................................................12
5. Ordering Information

One Stop Systems OSS-PCIe-4U-EXP-2022-400
Page 3
1. Overview
1.a. Description
The 4U expansion system provides 19 PCIe I/O slots with x16 connectors, 1 system host board (SHB) slot, an expansion link
board, a PCIe x4 or x8 host interface board (HIB) and a 2M PCIe cable.

One Stop Systems OSS-PCIe-4U-EXP-2022-400
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2. Components
2.a. Host cable adapter
The PCIe x8 host adapter installs in the host computer’s PCIe x4, x8 or x16 slot.
2.b. Expansion link board
The Expansion Link Board (ELB) OSS-CPCIe-3U/6U-ELB-x4 is a downstream link board that installs into a CPCIe chassis.
The ELB fits into the system slot of a CPCIe backplane. The ELB is the downstream link board and the primary fan-out
switch to support multiple configurations of CPCI or CPCIe expansion slots.
PCIe x4
connector
Internal LEDs
Slot Cover
(Also available in low
profile height)
PCIe x8
Connector
LVPECL
Clock
Buffer
Downstream
X8 PCI
Express
Cable
Connector
Upstream
X8 PCI Express
Card Edge
Connector
PCIe Signal
Redriver
PCIe Signal
Redriver
LEDs
Cable
Present/ Pwr
X8
PCIe
Rx
X8
PC
Ie
Rx
CPRS
NT#
+3.3v
Clock
*
Clock
*
LEDs
PCIe lane
status
X8
PCIe
Tx
X8
PCIe
Tx
*Clock direction shown in Host
configuration

One Stop Systems OSS-PCIe-4U-EXP-2022-400
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2.c. Host Adapter Specifications
Dimensions: (H x L): 2.2 x 4.5 inches (55 x 114mm)
Front Panel Connectors: One PCIe x8 cable connector
Front Panel Indicators: Power On / Cable Present LEDs
Power Consumption (designed to meet the following conditions) 3.75W typical, 3.3@ 1.3A
Operating Environment (designed to meet the following conditions)
Temperature Range: 0° to 50°C (32° to 122°F)
Relative Humidity: 10 to 90% non-condensing
Shock: 30g acceleration peak (11ms pulse)
Vibration: 5-17 Hz 0.5” double amplitude displacement; 7-2000Hz, 1.5g acceleration.
2.d. Expansion Link Board Specifications
Dimensions (H x L) 3.973 x 6.299 in (100 x 161 mm), 1 slot wide
Switch: PLX PEX8532 32 lane switch
External Interface Two x4 PCIe Cable Rev, 0.4 ports
Downstream Interface: 16 lanes of PCI Express on the backplane connectors are auto configurable on the card edge
connectors as: Two x8 PCIe links, Four x4 PCIe links
Front Panel Connectors: Molex 75586-0010
Front Panel Indicators: Bank of 4 upstream lane active indicators (green), Bank of 8 downstream link active indicators (green)
Internal Indicators: Power In-range Indicators for +12V, +3.3V & VTT (red/green), Power on indicator for +1V (green), Bank of
5 board status indicators (red)
Power Consumption: 10W typical +12V @ .5, 3.3V @ 1.25A, 5Vaux @ 2.5mA
Temperature Range: 0° to 70°C (32° to 122°F)
Relative Humidity: 10 to 90% non-condensing
Shock: 30g acceleration peak (11ms pulse)
Vibration: 5-17 Hz 0.5: double amplitude displacement; 7-2000Hz, 1.5g acceleration
2.e. Backplane Specifications
20-Slot Configuration: One system host slot, 17 PCI Express x4 slots with x16 connectors, 2 PCI Express x8 slots with x16
connectors.
Power Connections: Two 24-pin ATX, Two 8-pin auxiliary power.
Industry Specification: PICMG 1.3 System Host Board PCI Express Specification
Power Indicators: +5V, -5V, +12V and +3.3V
Backplane I/O Connectors: 2 Ethernet ports, up to 4 USB ports, 8 fan tach inputs, 8 LED outputs, 4 general purpose outputs,
8 general purpose inputs.
Temperature Sensors: 3 near rear of chassis on backplane, 1 near front of chassis on backplane, 4 external temperature
sensor headers.
Temperature Range: Operating temp 0° to 60°C (32° to 140°F) ambient. Short-term (30min) operating temp 5°C to 55°C
ambient. Storage temp -40°C to 70°C
Relative Humidity: Operating humidity 10-90% @ 40°C (non-condensing) Non-operating humidity 0-95% @ 40°C (non-
condensing)
Vibration: 5-17 Hz 0.5” double amplitude displacement; 7-2000Hz, 1.5g acceleration.

One Stop Systems OSS-PCIe-4U-EXP-2022-400
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3. Installation Instructions
3.a. Installing the Adapter Kit
1) Install the host cable adapter into an appropriate PCIe slot of the host computer. NOTE: For example, a PCIe x8
host board can be installed in a PCIe x16 or a x8 slot. It will still operate at x8 speeds.
3.b. When using with the 2-slot Backplane:
2) Install the expansion link board into the system host slot on the expansion system.
3) Connect the PCIe cable to both cable adapters.
a) Pull back on the tab, lifting the prongs that insert in the holes on the PCIe connector.
b) Push in the connector.
c) Release green thumb tab insuring that the prongs are fully engaged in the mating connector.
d) Test by pulling back on the connector.
3.c. Removing PCIe cable:
1) To remove PCIe cable pull back on green thumb tab to release metal pins and gently separate.

One Stop Systems OSS-PCIe-4U-EXP-2022-400
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4. Technical Information
4.a. Host adapter card switch settings
The OSS HIB2-x4 contains two x8 micro switches that allow configuration of the Pericom PI2EQX4402D’s equalization,
amplification and de-emphasis circuitry. The two switches, SW1 and SW2, are located above the Pericom devices on the
front side of the PCB.
SW1 and SW2 Switch Location and Orientation
Switch SW1 Settings Switch SW2 Settings
Switch
#
Signal
Name
Default*
Comments
1
ENABLE
Down
Up = Disable all Lanes
Down = Normal operation
2
RX_SEL0
Up
Rx Equalizer Selection
See Table 1
3
RX_SEL1
Up
4
RX_SEL2
Up
5
RX_SEL3
Up
Rx Amplifier Selection
See Table 2
6
RX_SEL4
Up
7
RX_SEL5
Up
Rx De-Emphasis
Selection
See Table 3
8
RX_SEL6
Up
Switch
#
Signal
Name
Default
*
Comments
1
N/C
Not connected
2
TX_SEL
0
Up
Tx Equalizer
Selection
See Table 1
3
TX_SEL
1
Up
4
TX_SEL
2
Up
5
TX_SEL
3
Down
Tx Amplifier Selection
See Table 2
6
TX_SEL
4
Down
7
TX_SEL
5
Up
Tx De-Emphasis
Selection
See Table 3
8
TX_SEL6
Down
ON, low, 0, Up
OFF, high, 1, Down
1 2 3 4 5 6 7 8
SW2
SW1
1
8
1
8

One Stop Systems OSS-PCIe-4U-EXP-2022-400
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Table 1 Table 2 Table 3
4.b. Host cable adapter LEDs
2
3
4
Equalization
0
0
0
No Equalization
0
0
1
1.5db @ 1.25 GHz
0
1
0
2.5db @ 1.25 GHz
0
1
1
3.5db @ 1.25 GHz
1
0
0
4.5db @ 1.25 GHz
1
0
1
5.5db @ 1.25 GHz
1
1
0
5.5db @ 1.25 GHz
1
1
1
7.5db @ 1.25 GHz
5
6
Swing
0
0
1x
0
1
0.8x
1
0
1.2x
1
1
1.4x
7
8
De-emphasis
0
0
0db
0
1
-2.5db
1
0
-3.5db
1
1
-4.5db
LED #
Function
CR2
Tx pair, Lane 0 (from card edge)
CR3
Rx pair, Lane 0 (from cable)
CR4
Tx pair, Lane 1 (from card edge)
CR5
Rx pair, Lane 1 (from cable)
CR6
Tx pair, Lane 2 (from card edge)
CR7
Rx pair, Lane 3 (from cable)
CR8
Tx pair, Lane 3 (from card edge)
CR9
Rx pair, Lane 2 (from cable)
Power LED
Cable present
LED
Power and
Cable present
LEDs
PCIe Lane Status LEDs
CR2
CR4
CR6
CR8
CR3
CR5
CR7
CR9

One Stop Systems OSS-PCIe-4U-EXP-2022-400
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4.c. Pin Assignments
Host adapter card connectors PCIe x4 Card Edge Connector
The pins are numbered as shown with side A on the top of the centerline on the solder side of the board and side B on the
bottom of the centerline on the component side of the board.
The PCIe interface pins PETpx, PETnx, PERpx, and PERnx are named with the following convention: “PE” stands for PCIe
high speed, “T” for Transmitter, “R” for Receiver, “p” for positive (+), and “n” for negative (-).
Note that adjacent differential pairs are separated by two ground pins to manage the connector crosstalk.
Pin-out for the PCIe x4 Card Edge Connector on the Host Cable Adapter
Pin #
Side B
Side A
Name
Description
Name
Description
1
N/C
N/C
PRSNT1#
Hot-Plug presence detect
2
N/C
N/C
N/C
N/C
3
N/C
N/C
N/C
N/C
4
GND
Ground
GND
Ground
5
NC
N/C
N/C
Not connected
6
N/C
N/C
JTAG3
TDI (Test Data Input)
7
GND
Ground
JTAG4
TDO (Test Data Output)
8
+3.3V
3.3 V power
N/C
Not connected
9
N/C
Not connected
N/C
Not connected
10
3.3Vaux
3.3 V auxiliary power
+3.3V
3.3 V power
11
N/C
N/C
PERST#
Fundamental reset
Mechanical key
12
RSVD
Reserved
GND
Ground
13
GND
Ground
REFCLK+
Reference clock (differential
pair)
14
PETp0
Transmitter differential pair,
Lane 0
REFCLK
15
PETn0
GND
Ground
16
GND
Ground
PERp0
Receiver differential pair, Lane 0
17
PRSNT2#
Hot-Plug presence detect
PERn0
18
GND
Ground
GND
Ground
19
PETp1
Transmitter differential pair,
Lane 1
RSVD
Reserved
20
PETn1
GND
Ground
21
GND
Ground
PERp1
Receiver differential pair, Lane 1
22
GND
Ground
PERn1
23
PETp2
Transmitter differential pair,
Lane 2
GND
Ground
24
PETn2
GND
Ground
25
GND
Ground
PERp2
Receiver differential pair, Lane 2
26
GND
Ground
PERn2
27
PETp3
Transmitter differential pair,
Lane 3
GND
Ground
28
PETn3
GND
Ground
29
GND
Ground
PERp3
Receiver differential pair, Lane 3
30
RSVD
Reserved
PERn3
31
PRSNT2#
Hot-Plug presence detect
GND
Ground
32
GND
Ground
RSVD
Reserved

One Stop Systems OSS-PCIe-4U-EXP-2022-400
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Notes:
1. Optional signals that are not implemented are left as no connects on the board side connector.
2. Reserved signals are no connects on the board side connector.
3. Although support of CWAKE# is optional from the board side connector perspective, an allocated wire is mandated for the cable
assembly.
4. Board side pin-outs on both sides of the link are identical. The cable assembly incorporates a null modem for the PCIe transmit
and receive pairs.
4.d. PCI Express x4 Connector Pin Assignment
Row A, Pin 1
Row B, Pin 19

One Stop Systems OSS-PCIe-4U-EXP-2022-400
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Pin-out for the PCIe x4 Cable
Pin #
Cable Side 1
Cable Side 2
Pin #
A1 A4 A7 A10 A13
A16 B1 B4 B7 B10
B13
GND
Drain Wires
GND
A1 A4 A7 A10 A13
A16 B1 B4 B7 B10
B13
A2
PETp0
Differential Pair
PERp0
B2
A3
PETn0
PERn0
B3
A5
PETp1
Differential Pair
PERp1
B5
A6
PETn1
PERn1
B6
Pin #
Cable Side 1
Cable Side 2
Pin #
A8
PETp2
Differential Pair
PERp2
B8
A9
PETn2
PERn2
B9
A11
PETp3
Differential Pair
PERp3
B11
A12
PETn3
PERn3
B12
A14
CREFCLK+
Differential Pair
CREFCLK+
A14
A15
CREFCLK
CREFCLK-
A15
A17
SB_RTN
Hook-up Wire
SB_RTN
A17
A18
CPRSNT#
Hook-up Wire
CPRSNT#
A18
A19
CPWRON
Hook-up Wire
CPWRON
A19
B2
PERp0
Differential Pair
PETp0
A2
B3
PERn0
PETn0
A3
B5
PERp1
Differential Pair
PETp1
A5
B6
PERn1
PETn1
A6
B8
PERp2
Differential Pair
PETp2
A8
B9
PERn2
PETn2
A9
B11
PERp3
Differential Pair
PETp3
A11
B12
PERn3
PETn3
A12
B14
PWR
NC
PWR
B14
B15
PWR
NC
PWR
B15
B16
PWR_RTN
NC
PWR_RTN
B16
B17
PWR_RTN
NC
PWR_RTN
B17
B18
CWAKE#
Hook-up Wire
CWAKE#
B18
B19
CPERST#
Hook-up Wire
CPERST#
B19
Backshell
Chassis Ground
Overall Cable
Braid
Chassis Ground
Backshell

One Stop Systems OSS-PCIe-4U-EXP-2022-400
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4.e. Signal Descriptions
4.f. Expansion link board switch settings
Downstream PCIe ports hardware strapping logic
CFG(0:2)
BP PORT CFG
0
1
2
A0
A1
A2
A3
B0
0
0
0
x4
x4
x4
x4
x4
0
1
0
x8
0
x4
x4
x4
0
1
1
x8
0
x8
0
x4
1
x
x
x16
0
0
0
x4
PETp(x)
PCI Express Transmit Positive signal of (x) pair.
PETn(x)
PCI Express Transmit Negative signal of (x) pair.
PERp(x)
PCI Express Receive Positive signal of (x) pair.
PERn(x)
PCI Express Receive Negative signal of (x) pair.
CREFCLK+/-
Cable REFerence CLocK: Provides a reference clock from the host system to the
remote system.
SB_RTN
Side Band ReTurN: return path for single ended signals from remote systems.
CPRSNT#
Cable PReSeNT: Indicates the presence of a device beyond the cable.
PWR
PoWeR: Provides local power for in-cable redriver circuits. Only needed on long
cables. Power does not go across the cable.)
PWR_RTN
PoWeR ReTurN: Provides local power return path for PWR pins.
CWAKE#
Cable WAKE
CPERST#
Cable PCI Express Reset

OSS-PCIe-4U-EXP-2022-400
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One Stop Systems
5. Ordering Information
OSS-KIT-EXP-6000
PCIe x4 expansion kit includes a PCIe x4 Gen 1 host cable adapter OSS-PCIe-HIB2-x4-H), a CPCIe x4 expansion link board (OSS-
CPCIe-3U-ELB-x4), and a PCIe x4 2M cable.
Related Products
OSS-PCIe-HIB2-x4-H-Host adapter card
OSS-CPCIe-3U-ELB-x4-CPCIe expansion Link board