x86 CPU for Kasli-DIOT

[gkasprow]

Kasli-DIOT has an extension connector where unused MGTs and IOs are exposed.
There are two use cases so far:

• additional SFPs
• CPU board with x86. For ARM CPU one can use Kasli-SOC.

The CPU option is a simple mezzanine with SMARC x86 CPU and connectors

The Kasli board is connected using following signals:

• S0-S2 MGTs + MGT_CLK -> SMARC PCIe; single lane is also acceptable
• S3 MGT -> 1000Base-X to 1000Base-T PNY -> SMARC GBT
• PCIe rst, PCIe wake -> SMARC PCIe
• UART, UART2 -> SMARC (
• FPGA testpoints -> SMARC GPIOs (need a logic level converter)
• P5V0MP -> DNP
• P2V5 -> logic translator
• P3V3 - EN for the onboard buck
• P12V0 - main supply rail

The mezzanine has several front panel connectors:

Ethernet -> SMARC GBT
USB host 1-> SMARC USB
USB host 2 -> SMARC USB
mini DP -> PHY -> SMARC Display port (as on the devkit)

The main board will also have:

• M.2 "short" SSD, preferably PCIe

Use proper heatsink and assembly holes for the x86 module - they dissipate a lot of power
Use proper distances between boards and add them to BOM