IMX6-CycloneV interface description
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Introduction
This article describe the bus interface configuration to communicate between i.MX6 processor and CycloneV FPGA. In i.MX6, the bus used to make communication with the FPGA is the PCI express.
Simplified view
Figure 1 is a simplified view of APF6 schematics, signals are :
- PCIE_CLK: 100Mhz differential pcie clock (PCIE_CLKN and PCIE_CLKP).
- PCIE_RX: Differential receive pcie signal lane0 (PCIE_RXN and PCIE_RXP).
- PCIE_TX: Differential transmit pcie signal lane0(PCIE_TXN and PCIE_TXP).
- npor: set to Vcc.
- nperst: set to vcc.
- coreclkout: 125Mhz (by default) clock generated by quartus hard PCIe ip-core, used to clock design by defaut.
FPGA pinout
FPGA pinout is the following :
# PCIE_RX set_instance_assignment -name IO_STANDARD "1.5-V PCML" -to hip_serial_rx_in0 set_location_assignment PIN_AA2 -to hip_serial_rx_in0 set_location_assignment PIN_AA1 -to "hip_serial_rx_in0(n)" # PCIE_TX set_instance_assignment -name IO_STANDARD "1.5-V PCML" -to hip_serial_tx_out0 set_location_assignment PIN_Y4 -to hip_serial_tx_out0 set_location_assignment PIN_Y3 -to "hip_serial_tx_out0(n)" # PCIE_CLK set_instance_assignment -name IO_STANDARD "1.5-V PCML" -to refclk_clk set_location_assignment PIN_V4 -to refclk_clk set_location_assignment PIN_U4 -to "refclk_clk(n)" # nperst set_location_assignment PIN_R17 -to nperst # npor set_location_assignment PIN_R16 -to npor
