Technical Information
Product description
FPGA Drive is an adapter that allows M.2 PCIe SSDs to be connected to FPGAs. The adapter uses the FPGA Mezzanine Card (FMC) form factor for connection with FPGA and MPSoC development boards via the FMC connector. It has 2x M.2 sockets and can carry M.2 PCIe SSDs of length 42mm, 60mm, 80mm or 110mm. Each M.2 socket has its own independent connection to the FPGA for maximum throughput and can support a 4-lane PCIe connection up to Gen3.
Power supply
All power to the FPGA Drive FMC is supplied through the carrier’s FMC connector. The FPGA Drive FMC makes use of the FMC’s 3.3VDC supply to power one of the SSDs, and it has a switching regulator to power the other SSD using the FMC’s 12VDC supply.
The adjustable voltage supply (VADJ), which is supplied by all standard FMC carriers, can be set to any voltage between 1.8V and 3.3V. The FPGA Drive FMC’s onboard FRU EEPROM specifies a 1.8V VADJ for all carriers that have a power management system.
Interface with FPGA
The adapter has a high pin-count (HPC) FMC connector (Samtec ASP-134488-01) which can be mated with either an LPC or HPC FMC. The pinout conforms to the Vita 57.1 FPGA Mezzanine Card (FMC) Standard. When mated with a LPC FMC connector, only one SSD is connected using 1-lane PCIe. When mated with a HPC FMC connector, both SSDs can be used, each with a 4-lane PCIe connection (depends on the carrier board used, please see compatibility table below).
M.2 sockets
TE-Connectivity M.2 form factor socket, part number 1-2199230-6, is designed to mate with M-key M.2 PCI Express SSDs.
100MHz Clock Oscillators
Micrel 100MHz MEMs based clock oscillator, part number DSC557-0344SI1, generates two precision 100MHz clocks: one HCSL and the other LVDS. The HCSL clock feeds the SSD while the LVDS clock feeds the FPGA. FPGA Drive FMC uses two of these devices, one for each SSD.
Dimensions
The FPGA Drive adapter is 69mm x 141.5mm. FPGA Drive FMC does not conform to the mechanical specifications of the Vita 57.1 standard due to the length of M.2 modules.
FPGA Drive FMC Rev-B Mech drawing (version for 1x SSD – phased out)
FPGA Drive FMC Rev-D Mech drawing (version for 2x SSDs)
Compatibility
FPGA Drive FMC is pin-compatible to all carriers that conform to the Vita 57.1 standard. Compatible carriers include the KC705, VC707, VC709, KCU105 and ZCU106. FPGA Drive FMC can only be used on FMC carriers with transceiver-loaded FMCs. If you are not sure if FPGA Drive is compatible with your FPGA board, please contact us.
Schematics
FPGA Drive FMC Schematics RevB-2 (version for 1x SSD – phased out)
FPGA Drive FMC Schematics RevD-1 (version for 2x SSDs)
Carrier Compatibility Table
| Carrier | First SSD | Second SSD |
|---|---|---|
| PicoZed 7015 and PicoZed FMC Carrier Card V2 | LPC: 1-lane, Gen1 | Not supported |
| PicoZed 7030 and PicoZed FMC Carrier Card V2 | LPC: 1-lane, Gen2 | Not supported |
| KC705 | HPC: 4-lanes Gen2 LPC: 1-lane Gen2 | HPC: Not supported LPC: Not supported |
| VC707 | HPC1: 4-lanes Gen2 HPC2: 4-lanes Gen2 | HPC1: 4-lanes Gen2 HPC2: 4-lanes Gen2 |
| VC709 | HPC: 4-lanes Gen3 | HPC: 4-lanes Gen3 |
| ZC702 | Not supported (no GTX) | Not supported (no GTX) |
| ZC706 | HPC: 4-lanes Gen2 LPC: 1-lane Gen2 | Not supported (Zynq-7000 devices only have 1 PCIe block) |
| KCU105 | HPC: 4-lanes Gen3 LPC: 1-lane Gen3 | HPC: 4-lanes Gen3 LPC: Not supported |
| ZCU102 (no example design provided) | HPC0: 4-lanes Gen3 HPC1: 4-lanes Gen3 (using soft IP) | HPC0: 4-lanes Gen3 HPC1: 4-lanes Gen3 (using soft IP) |
| ZCU106 | HPC0: 4-lanes Gen3 HPC1: 1-lane Gen3 | HPC0: 4-lanes Gen3 HPC1: Not supported |
- FPGA Drive is not compatible with the ZC702 board as it does not have any gigabit transceivers.
- FPGA Drive FMC is compatible with ZCU102 board, however it must connect to a soft PCIe IP and we do not provide any example design for this at the present time.
FMC Transceiver Assignments
The table below outlines the assignment of the FMC transceivers (DP0 to DP7) to the 2x SSDs. Each SSD is connected to 4x gigabit transceivers. The first SSD (SSD1) connects to transceivers DP0-DP3, while the second SSD (SSD2) connects to transceivers DP4-DP7. Note that all LPC connectors have a maximum of 1x gigabit transceiver (DP0), therefore they can only support a 1-lane PCIe connection to SSD1, and they cannot support SSD2. Also note that not all carriers with HPC connectors have all the transceivers connected.
| FMC Gigabit Transceiver | SSD1 PCIe Lanes | SSD2 PCIe Lanes |
|---|---|---|
| DP0 | Lane 0 | |
| DP1 | Lane 1 | |
| DP2 | Lane 2 | |
| DP3 | Lane 3 | |
| DP4 | Lane 0 | |
| DP5 | Lane 1 | |
| DP6 | Lane 2 | |
| DP7 | Lane 3 |