OSS OSS-521 Gen4 User manual

INSTALLATION GUIDE
OSS-521 Gen4 Backplane
OSS-521 Gen4 Backplane
www.onestopsystems.com

One Stop Systems
OSS-521 Gen4 BP 2
Table of Contents
1Getting Started ...............................................................................................................4
2Unpacking......................................................................................................................4
3Description of Parts..........................................................................................................5
3.1 Backplane............................................................................................................................... 5
3.2 Upstream and Downstream Slots .................................................................................................... 6
3.3 Slot LEDs ................................................................................................................................ 6
3.4 Board LEDs.............................................................................................................................. 7
3.5 Slot Type................................................................................................................................ 7
3.6 ARF6 Connectors....................................................................................................................... 8
3.7 PS_ON ................................................................................................................................... 8
3.8 Block Diagram.......................................................................................................................... 9
3.9 Slot Configurations ...................................................................................................................10
3.10 OSS-521 Backplane with Kit vs. no Kit .............................................................................................12
3.11 Use Case Diagrams....................................................................................................................13
3.12 Supported Setup ......................................................................................................................15
3.13 Not Supported Setup .................................................................................................................15
3.14 Slot Number and Port Mapping......................................................................................................16
4 Hardware Requirements................................................................................................... 17
4.1 OSS-PCIe-HIB616-x16 card ...........................................................................................................17
4.2 SFF-8644 Gen4 x4 Cable .............................................................................................................17
4.3 Expansion Chassis with ATX Power Supply ........................................................................................17
5Backplane Installation ..................................................................................................... 18
6Cable Adapter Card Installation ......................................................................................... 20
6.1 Target Card Installation .............................................................................................................20
6.1.1 Target Card Switch Settings .....................................................................................................20
6.2 Host Card Installation ................................................................................................................21
6.2.1 Host Card Switch Settings (x16 Configuration)................................................................................21
7Cable Installation ........................................................................................................... 23
7.1 Connect Mini-SAS HD SFF-8644 Cables .............................................................................................23
8PCIe Card Installation...................................................................................................... 24
9Powering UP the unit ...................................................................................................... 24
10 Hardware Check ............................................................................................................ 25
10.1 Verify Board LEDs.....................................................................................................................25
10.2 Fault LEDs (RED) ......................................................................................................................26
10.3 Verify Adapter Card LEDs............................................................................................................27
10.4 Slot LEDs ...............................................................................................................................28
11 Verify OSS Devices ......................................................................................................... 29
11.1 Linux OS................................................................................................................................29

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OSS-521 Gen4 BP 3
11.2 Windows 10 / Server .................................................................................................................31
12 Verify PCIe cards ........................................................................................................... 33
12.1 Linux ...................................................................................................................................33
12.2 Windows ...............................................................................................................................34
13 Troubleshooting ............................................................................................................ 36
13.1 Device is not detected or recognized ..............................................................................................36
13.2 My PCIe devices are showing UP with a Yellow Exclamation mark.............................................................36
13.3 No link between host and target cards ............................................................................................36
13.4 Broken OSS-Backplane ...............................................................................................................36
13.5 My PCIe cards are not detected ....................................................................................................36
14 How to Get More Help ..................................................................................................... 37
14.1 Contacting Technical Support.......................................................................................................37
14.2 Returning Merchandise...............................................................................................................37
14.3 Third Party Hardware & Software Support Policy ................................................................................37
14.4 Online Support Resources ...........................................................................................................37

One Stop Systems
OSS-521 Gen4 BP 4
1 Getting Started
This is section is all about the steps on how to install the backplane. You will find instructions for the following procedures:
Unpacking
Description of Parts
Hardware Requirements
Backplane Installation
Cable Adapter Card Installation
Link Cable Installation
Powering Up the unit / system
Board LED Indicator
Verify Device Installation
2 Unpacking
Check and identify the standard supplied item. Inspect the backplane for physical defects and damages.
To achieve good performance and reliability it is recommended to use a certified and compatible set of an OSS Gen4
adapter cards (aka: Host Interface Board) and a Gen4 Mini-SAS HD SFF-8644 cables.
The OSS backplane is designed and programmed to work with OSS Gen4 adapter cards.

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OSS-521 Gen4 BP 5
3 Description of Parts
3.1 Backplane
Item
Name
Description
1
12V Input Power
12V input power for the 538 board. Not to be used for external GPU aux
2
ARF 6 Top Connectors
For connecting ARC 6 cables between ”Option slot” and PEX switch
3
I2C and temp sensors interface
Connector for I2C and temp sensors interface to the power backplane
4
Ethernet port
Not used
5
Passive Heat sink
Moves heat away from the PCIe chip
6
PCIe Downstream Slots / Port
PCIe card slot for 3rd Party PCIe cards
7
Option Slot
Configurable card slot to operate either as an Upstream or Downstream modes
8
Card Slot LED
LED status indicator when slot is populated or not. Solid green when card is present.
Off, when no card
9
Target Slot LED
LED status indicator for Target card. Solid green when Gen 4 adapter card is installed
10
Upstream Port / Target Slot
Designated slot for Target card only
11
Dip Switches
For slot configuration
12
Board LEDs
LED status indicator for the board
13
FPGA Connector
FPGA Programming connector
14
PS_ON
Enable to force power ON the backplane by placing a jumper on the connector
15
Temperature Sensor
Sensor for detecting temperature on the board
16
24-pin ATX Power Connector
For connecting ATX Power Supply
17
PCIe Switch Port
PCIe switch management port, optional
18
ARF 6 Bottom Connectors
For connecting ARC 6 cables between ”Option slot” and PEX switch
19
Screw-Mounting Holes
For securing the board on to an enclosure

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OSS-521 Gen4 BP 6
3.2 Upstream and Downstream Slots
Upstream Slot: Also known as target slot. Designated slot for the Target adapter card only. OSS Host card or any PCIe cards will
not operate in the Upstream slot / Target slot.
Slot 0 is the default slot number for the Upstream slot.
Downstream Slots: These are PCIe card slots #1, #2, #3, #, #5, #6 and #7. Do not use the downstream slots for HIB Target card.
Option Slot: Slot 8, when configured accordingly, it will operate either in an Upstream mode or Downstream mode.
Slot 8 configured as Downstream mode, will only work with an end-point device or a 3rd party PCIe card.
Configured as an Upstream mode, use only with an OSS HIB Target card.
3.3 Slot LEDs
Item
Name
Description
When Lit (Solid Green or Blinking)
When Off
1
Target Slot LED
Upstream Slot LED
Solid = Gen4 Link
OFF - Not Linked / No Card
present in the slot
Blink 2Hz = Gen3 Link
Blink 1Hz = Gen2 Link
Blink 0.5Hz = Gen1 Link (Slow Blinking)
2
Downstream LED
PCIe slot LEDs
Solid = Gen4 Link
OFF - Not Linked / No Card
present in the slot
Blink 2Hz = Gen3 Link
Blink 1Hz = Gen2 Link
Blink 0.5Hz = Gen1 Link (Slow Blinking)
3
Aux Power LED
Auxiliary Board power LED
This is GREEN, denotes existence of
auxiliary power +5VAUX
Board is at fault / error

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OSS-521 Gen4 BP 7
3.4 Board LEDs
LED#
NAME
Description
CR2
FE LED
FE-Fault Error (SYS_ERROR#) LED
D7
DC LED
PCIe slot LEDs Daisy Chain Port Link Status LED
D8
LED 0
All Power Good
D9
LED 1
FPGA Blinking LED (When FPGA code is loaded and working: 8 blinks, 2 pause counts, 8 blinks
D10
CONFIG
Config output from the FPGA, but enabled as an FPGA option. When RED, board is not programmed. OFF,
board is programmed.
3.5 Slot Type
Slot Type: Closed-ended PCIe slot / connector, all the slots are x16 mechanical.
Six x8 electrical slots (slots 1, 2, 3, 4, 5 and 6)
Three x16 electrical slots(slots 0, 7 and 8)

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OSS-521 Gen4 BP 8
3.6 ARF6 Connectors
ARF6 Connector - For connecting ARC6 cable to daisy chain two backplanes together and to create a bridge or connection
between SLOT 8 and the PCIe switch.
3.7 PS_ON
The board has a two-pin connector for placing a shunt / jumper that allows the backplane to be ON all the time when an ATX
power supply is switched ON. See photos below for the location of the JP5 connector on the backplane.

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OSS-521 Gen4 BP 9
3.8 Block Diagram

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OSS-521 Gen4 BP 10
3.9 Slot Configurations
Configuration# 1: Default slot configuration. One Upstream slot and eight Downstream slots.
ARC6 cables are required and must be attached between the edge of the board and the slot connectors under the
backplane. Without those ARC6 cables nothing will work in SLOT 8.
Configuration# 2: Two Upstream slots (Slot 0 and SLOT 8) with two partitions.
Slot 0: Partition #1 with four Downstream slots
Slot 8: Partition #2 with three Downstream slots

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OSS-521 Gen4 BP 11
Configuration# 3: Two backplanes are daisy chained together.
One Upstream slot and 15 Downstream slots.

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OSS-521 Gen4 BP 12
3.10 OSS-521 Backplane with Kit vs. no Kit
OSS-521 backplane with kit, which includes two ARC 6 cables installed to enable slot 8, see photos below.
Part# OSS-BP-521-LSKIT
OSS-521 backplane with no kit installed (no ARC 6 cables), see photos below.
Part# OSS-BP-521

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OSS-521 Gen4 BP 13
3.11 Use Case Diagrams
Configuration 1
OSS-521 backplane is linked to a single host computer. Four x4 link cables are connected between OSS Gen4 Host card and Target
card.
8 Downstream slots
6 x8 slots (Slot 1, 2, 3, 4, 5 and 6)
2 x16 slots (Slot 7 and 8)
Configuration 2
OSS-521 backplane is linked to two host computers, see diagram below.
Two partitions / two Upstream slots (Slot 0 and SLOT 8) with a total of 7 downstream slots.
Slot 0: Partition #1 with four Downstream slots
o4 x8 slots (Slot 1, 2, 3 and 4)
Slot 8: Partition #2 with three Downstream slots
o2 x8 slots (Slot 5 and 6)
o1 x16 slot (Slot 7)

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OSS-521 Gen4 BP 14
Configuration 3
Two OSS-521 backplane are daisy chained together and it is linked to a single host computer.
With a total of 15 Downstream slots
1st backplane: 7 downstream slots
6 x8 slots (slot 1, 2, 3, 4, 5 and 6)
1 x16 slot (slot 7)
One non-operational slot (slot 8)
2nd backplane: 8 downstream slots
6 x8 slots (slot 1, 2, 3, 4, 5 and 6)
2 x16 slots (slot 0 and 7)
One non-operational slot (slot 8)

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OSS-521 Gen4 BP 15
3.12 Supported Setup
This is a validated /supported setup for using the OSS-521 backplane with a host computer and an OSS HIB adapter cards.
Requires a set of OSS-PCIe-HIB616-x16 card, configured as Target and Host cards.
OSS Gen4 backplane with OSS Target card
Host computer with OSS Host card
PCIe Gen4 cables.
3.13 Not Supported Setup
1. Backplane to Backplane, not a supported setup. It will not work.
2. Third Party FPGA Adapter cards
Using a custom FPGA adapter card with the backplane is not supported. OSS manufactured, tested and certified an FPGA
adapter card that is compatible with OSS backplane. We offer a variant of proprietary OSS FPGA adapter cards that are designed
to operate reliably with OSS backplanes.
Customer is solely responsible for troubleshooting their custom FPGA adapter card when problem arises upon using it
with the OSS backplane.
Damaging the backplane by using a non validated HIB cable adapter cards will not be covered under warranty.

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OSS-521 Gen4 BP 16
3.14 Slot Number and Port Mapping
Each slot on the OSS backplane is mapped to a PCIe port on the 88096 PCIe switch. Port mapping is hard-coded, it is essentially
fixed. No means of changing or modifying it.
For example, a single GPU or PCIe card is seated in slot 2 on the backplane, PCIe port 56 will be automatically assigned to the
card.
Port / Slot
Slot Mapping: 88096 Port
Slot 0
0
Slot 1
48
Slot 2
56
Slot 3
64
Slot 4
72
Slot 5
80
Slot 6
88
Slot 7
32
Slot 8
16 (Daisy chain)
If slot 8 is cabled to the daisy chain port, it becomes port 16 of the 88096
(regardless of upstream/downstream configuration).
NA: If not enabled, no port assignment.

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OSS-521 Gen4 BP 17
4 Hardware Requirements
1. OSS-PCIe-HIB616-x16 card configured as Host
2. OSS-PCIe-HIB616-x16-T card configured as Target
3. Gen 4 PCIe x4 cable
a. x16 Configuration: Four PCIe Gen4 cables
b. X8 Configuration: Two PCIe Gen4 cables
c. X4 Configuration: One PCIe Gen4 cable
4. Gen4 x16 PCIe slot (computer motherboard)
5. OSS Expansion enclosure
6. ATX Power Supply: Minimum of 200O Watt
4.1 OSS-PCIe-HIB616-x16 card
A pair of OSS Gen4 x16 cards, one as host card and the other as target card.
4.2 SFF-8644 Gen4 x4 Cable
Use Gen 4 PCI Express (PCIe) rated cables. This passive copper cable mates to the SFF-8644 connectors on the HIB6xx family of
OSS host interface board. Tested and validate with 1m, 2m and 3m lengths. Single or multiple cables can form larger PCIe links.
ox4 (1 cable)
ox8 (2 cables)
oX16 (4 cables)
Use PCIe Gen 4 (BLACK plastic-pull tab), see photo below. The FPGA in the HIB616-x16 card does not support CMI operations.
4.3 Expansion Chassis with ATX Power Supply

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OSS-521 Gen4 BP 18
5 Backplane Installation
Before mounting the backplane, inspect the chassis for any protruding metals.
Turn the backplane over to access the onboard 24-PIN ATX Power connector.
Connect the ATX power cable to the onboard 24-PIN ATX power connector as shown from the photos below.
Connect the 12v Aux power cables to the 12V input connectors.

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OSS-521 Gen4 BP 19
Install the board in the chassis / enclosure. The photos below are two available enclosures or expansion units that you can use
for housing the OSS-521backplane.
4UP enclosure: Applicable for “dual backplane” installation
EB4400 enclosure: For “single backplane” installation
Place the OSS-backplane on top of the stand-offs and align the screw-mounting holes. Secure the backplane with the screws.

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OSS-521 Gen4 BP 20
6 Cable Adapter Card Installation
To operate the backplane you need two OSS compatible / certified “HIB adapter cards". Use an OSS Gen4 x16 PCIe Host *&
Target cable adapter cards.
Target card: HIB card configured to operate in target mode. This is an OSS certified and compatible HIB card installed
directly on the OSS backplane’s target slot / upstream slot.
Host Card: HIB card configured to operate in host mode. Installed in the host computer motherboard’s Gen 4 x16 PCIe
slot.
For more details on OSS-PCIe-HIB616-x16 card (Host / Target card) please refer to the OSS-PCIe-HIB616-x16installation guide.
https://www.onestopsystems.com/product/pcie-x16-gen-4-cable-adapter
6.1 Target Card Installation
Use the designated Target Slot / Upstream Slot on the backplane when installing the card.
The HIB card configured as Target card will only operate in the target slot / upstream slot.
See photo below for the correct default location of the Target slot (Upstream Slot).
6.1.1 Target Card Switch Settings
Check and verify the switches are set to target mode before installing the card.
See photos below for Target card switch settings.
SW1 #1 = ON; SW1 #2= ON
SW2 = All OFF
If the switches are set incorrectly, will result to no connectivity between the host system and target device.