Hardware/FPGARack4ethernet

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The board is compatible with the [[Hardware/FPGARackBackplane|FPGA Rack Backplane]] for interconnecting different boards with the help of the [[Standards/HEVs_'VME'_Backplane_Bus|HES-SO Backplane Bus]] and the [[Components/IP/VME|HES-SO VME IP Core]].
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The board is compatible with the [[Hardware/FPGARackBackplane|FPGA Rack Backplane]] for interconnecting different boards with the help of the [[Standards/HEI_'VME'_Backplane_Bus|HES-SO Backplane Bus]] and the [[Components/IP/VME|HES-SO VME IP Core]].
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It holds 4 Ethernet connectors, each connected to an independent [http://www.microchip.com/wwwproducts/Devices.aspx?product=KSZ8041 KSZ8041NL PHY].
  
= PHY clocks =
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= Ethernet =
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== PHY clocks ==
  
 
All 4 PHYs receive the same 25 MHz clock.
 
All 4 PHYs receive the same 25 MHz clock.
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The last possibility is foreseen to [https://en.wikipedia.org/wiki/Synchronous_Ethernet synchronise] the clocks of slave Ethernet ports to the one of a master port.
 
The last possibility is foreseen to [https://en.wikipedia.org/wiki/Synchronous_Ethernet synchronise] the clocks of slave Ethernet ports to the one of a master port.
  
= Management Data Input Output (MDIO) =
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== Management Data Input Output (MDIO) ==
  
 
The serial [[Standards/MDI|Management Data Input Output (MDIO)]] interface is connected independently from each PHY to the FPGA.
 
The serial [[Standards/MDI|Management Data Input Output (MDIO)]] interface is connected independently from each PHY to the FPGA.
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= Serial ports =
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The FPGA has 3 serial port connections:
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* one via an [http://www.ftdichip.com/Products/ICs/FT232R.htm FT232RL] RS232 to USB interface (<code>USB_TXD</code>, <code>USB_RXD</code> and 6 more lines)
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* 2&nbsp;via a [https://datasheets.maximintegrated.com/en/ds/MAX3224E-MAX3245E.pdf level translator]
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** the first goes to a flat cable connector (<code>UART_TXD0</code>, <code>UART_RXD0</code>)
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** the second to the JTAG mini connector (<code>UART_TXD1</code>, <code> UART_RXD01</code>)
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== USB serial interface ==
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The [http://www.ftdichip.com/Products/ICs/FT232R.htm USB serial interface] powers the board
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if jumper <code>JP1</code> is set on the <code>USB_5V</code> side.
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It provides a serial port and a JTAG interface.
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The serial port is connected directly to the FPGA.
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The JTAG interface can be connected to the FPGA programming lines via zero-Ohm resistors.
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This programming mode has not been tested yet.
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= JTAG connector =
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The HEI 10-pin JTAG connector provides:
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* a 3.3&nbsp;V power supply
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* 4&nbsp;JTAG signals for FPGA and Flash programmation
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* a minimal serial port (Rx and Tx)
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* 2&nbsp;FPGA I/O lines
  
 
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Latest revision as of 11:42, 12 December 2016

Contents

This board is a variant of the FPGA rack board, but with 4 Ethernet connectors.

Type FPGA Rack Schematic UCF Description
V1.0 FPGA Rack Ethernet4 V1.0 FPGA-Rack-Ethernet4 v1.0 Schematic PDF FPGA-Rack v1.0 UCF Files There are different FPGA mounted: Spartan 6 XC6SLX45, Spartan 6 XC6SLX100, Spartan 6 XC6SLX150

The board is compatible with the FPGA Rack Backplane for interconnecting different boards with the help of the HES-SO Backplane Bus and the HES-SO VME IP Core. It holds 4 Ethernet connectors, each connected to an independent KSZ8041NL PHY.

Ethernet

PHY clocks

All 4 PHYs receive the same 25 MHz clock. This clock signal can be sourced from:

  • the quartz oscillator closest to the PHYs (CLK_PHY_25M)
  • the FPGA (CLK_PHY_FPGA, pin AB13).

The FPGA can generate the PHY clock from

  • a 106.25 MHz quartz (CLK_106_25M, pin Y13)
  • the PHY quartz oscillator (CLK_PHY_25M, pin AA12)
  • one of the PHY Rx or Tx clocks (ETHA_RX_CLK, ETHA_TX_CLK, ETHB_RX_CLK, …)

The last possibility is foreseen to synchronise the clocks of slave Ethernet ports to the one of a master port.

Management Data Input Output (MDIO)

The serial Management Data Input Output (MDIO) interface is connected independently from each PHY to the FPGA.

Serial ports

The FPGA has 3 serial port connections:

  • one via an FT232RL RS232 to USB interface (USB_TXD, USB_RXD and 6 more lines)
  • 2 via a level translator
    • the first goes to a flat cable connector (UART_TXD0, UART_RXD0)
    • the second to the JTAG mini connector (UART_TXD1, UART_RXD01)

USB serial interface

The USB serial interface powers the board if jumper JP1 is set on the USB_5V side.

It provides a serial port and a JTAG interface. The serial port is connected directly to the FPGA. The JTAG interface can be connected to the FPGA programming lines via zero-Ohm resistors. This programming mode has not been tested yet.

JTAG connector

The HEI 10-pin JTAG connector provides:

  • a 3.3 V power supply
  • 4 JTAG signals for FPGA and Flash programmation
  • a minimal serial port (Rx and Tx)
  • 2 FPGA I/O lines
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