2.7. Interface Signals and Parameter

DisplayPort Cyclone® 10 GX FPGA IP Design Example User Guide

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Date 4/29/2024

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2.7. Interface Signals and Parameter

The tables list the signals and parameter for the DisplayPort Intel® FPGA IP design example.

Table 14. Top-Level Signals
Signal	Direction	Width	Description
On-board Oscillator Signal
`refclk2_p`	Input	1	100 MHz clock source used as IOPLL reference clock and Avalon-MM management clock
User Push Buttons and LEDs
`user_pb[0]`	Input	1	Push button to trigger MSA print out during debug
`user_pb[1]`	Input	1	Push button to switch to the next video stream, for the MST parallel loopback with PCR design example.
`user_pb[2]`	Input	1	Global reset
`user_led_g`	Output	4	Green LED display Note: Refer to Hardware Setup for the on-board user LED functions.
DisplayPort FMC Daughter Card Pins on FMC
`fmc_gbtclk_m2c_p`	Input	1	135 MHz dedicated transceiver reference clock from FMC port
`fmc_dp_m2c_p`	Input	N	DisplayPort RX serial data Note: N = RX maximum lane count
`fmc_dp_c2m_p`	Output	N	DisplayPort TX serial data Note: N = TX maximum lane count
`fmc_la_tx_p_10`	Input	1	DisplayPort RX cable detect 1 = Cable detected 0 = Cable not detected
`fmc_la_rx_n_8`	Input	1	DisplayPort RX power detect 1 = Power not detected 0 = Power detected
`fmc_la_tx_n_9`	Input	1	DisplayPort RX Aux In
`fmc_la_rx_n_6`	Output	1	DisplayPort RX Aux Out
`fmc_la_tx_p_9`	Output	1	DisplayPort RX Aux OE
`fmc_la_rx_p_6`	Output	1	DisplayPort RX HPD 1 = HPD asserted 0 = HPD deasserted
`fmc_la_rx_n_9`	Input	1	DisplayPort TX HPD 1 = HPD asserted 0 = HPD deasserted
`fmc_la_tx_p_12`	Input	1	DisplayPort TX Aux In
`fmc_la_rx_p_10`	Output	1	DisplayPort TX Aux Out
`fmc_la_rx_n_10`	Output	1	DisplayPort TX Aux OE
`fmca_la_tx_n_12`	Output	1	TX CAD for Bitec FMC Rev. 8
`fmca_la_tx_p_14`	Output	1	TX CAD for Bitec FMC Rev. 10 and 11
FMC On-board Retimer Reconfiguration Interface
`fmca_la_tx_p_0`	Inout	1	Bitec FMC Rev. 10: PS8460_SDA Bitec FMC Rev. 11: MCDP6000_SDA
`fmca_la_tx_n_0`	Inout	1	Bitec FMC Rev. 10: PS8460_SCL Bitec FMC Rev. 11: MCDP6000_SDL
`fmca_la_rx_p_0`	Output	1	Bitec FMC Rev. 10: PS8460_EQ0 Bitec FMC Rev. 11: Unused
`fmca_la_rx_n_0`	Output	1	Bitec FMC Rev. 10: PS8460_EQ1 Bitec FMC Rev. 11: Unused
`fmca_la_tx_p_1`	Output	1	Bitec FMC Rev. 10: PS8460_PDN Bitec FMC Rev. 11: Unused
`fmca_la_tx_n_1`	Output	1	Bitec FMC Rev. 10: PS8460_CFG0 Bitec FMC Rev. 11: Unused
`fmca_la_tx_p_2`	Output	1	Bitec FMC Rev. 10: PS8460_CFG1 Bitec FMC Rev. 11: Unused
`fmca_la_tx_n_2`	Output	1	Bitec FMC Rev. 10: PS8460_CFG2 Bitec FMC Rev. 11: Unused

Table 15. DisplayPort Intel® FPGA IP Signals (Platform Designer System)
Signal	Direction	Width	Description
Clock and Reset
`clk_100_in_clk`	Input	1	100 MHz clock to CPU sub-system
`cpu_reset_bridge_in_reset_n`	Input	1	Reset to CPU sub-system (active low)
DisplayPort RX Signals
`dp_rx_reset_bridge_in_reset_n`	Input	1	Reset to RX sub-system (active low)
`dp_rx_clk_16_in_clk`	Input	1	RX Auxiliary clock (16 MHz)
`dp_rx_dp_sink_clk_cal`	Input	1	RX reconfiguration calibration clock
`dp_rx_pio_0_in_port`	Input	1	Push button IO for debug purpose
`dp_rx_dp_sink_rx_audio_valid`	Output	1	RX Audio Interface Note: M = RX audio channel
`dp_rx_dp_sink_rx_audio_mute`	Output	1
`dp_rx_dp_sink_rx_audio_infoframe`	Output	40
`dp_rx_dp_sink_rx_audio_lpcm_data`	Output	M*32
`dp_rx_dp_sink_rx_aux_in`	Input	1	RX auxiliary interface
`dp_rx_dp_sink_rx_aux_out`	Output	1
`dp_rx_dp_sink_rx_aux_oe`	Output	1
`dp_rx_dp_sink_rx_hpd`	Output	1	RX HPD
`dp_rx_dp_sink_rx_cable_detect`	Input	1	RX cable detect (active high)
`dp_rx_dp_sink_rx_pwr_detect`	Input	1	RX power detect (active high)
`dp_rx_dp_sink_rx_msa`	Output	217	DisplayPort RX MSA
`dp_rx_dp_sink_rx_lane_count`	Output	5	DisplayPort RX lane count
`dp_rx_dp_sink_rx_link_rate`	Output	2	RX Link Rate 2-bit indicator, used in PCR RBR: 2‘b00 HBR: 2‘b01 HBR2: 2‘b10 HBR3: 2'b11
`dp_rx_dp_sink_rx_link_rate_8bits`	Output	8	RX Link Rate 8-bit indicator, used in transceiver reconfiguration management RBR: 0x06 HBR: 0x0A HBR2: 0x14 HBR3: 0x1E
`dp_rx_dp_sink_rx_ss_valid`	Output	1	DisplayPort RX secondary stream interface
`dp_rx_dp_sink_rx_ss_data`	Output	160
`dp_rx_dp_sink_rx_ss_sop`	Output	1
`dp_rx_dp_sink_rx_ss_eop`	Output	1
`dp_rx_dp_sink_rx_ss_clk`	Output	1
`dp_rx_dp_sink_rx_stream_valid`	Output	1	RX post scrambler stream data. For debug purpose. Note: S = RX symbols per clock
`dp_rx_dp_sink_rx_stream_clk`	Output	1
`dp_rx_dp_sink_rx_stream_data`	Output	S*32
`dp_rx_dp_sink_rx_stream_ctrl`	Output	S*4
`dp_rx_dp_sink_rx_vid_clk`	Input	1	DisplayPort RX video stream interface. Note: B = RX bits per component, P = RX pixels per clock
`dp_rx_dp_sink_rx_vid_sol`	Output	1
`dp_rx_dp_sink_rx_vid_eol`	Output	1
`dp_rx_dp_sink_rx_vid_sof`	Output	1
`dp_rx_dp_sink_rx_vid_eof`	Output	1
`dp_rx_dp_sink_rx_vid_locked`	Output	1
`dp_rx_dp_sink_rx_vid_interlace`	Output	1
`dp_rx_dp_sink_rx_vid_field`	Output	1
`dp_rx_dp_sink_rx_vid_overflow`	Output	1
`dp_rx_dp_sink_rx_vid_data`	Output	BP3
`dp_rx_dp_sink_rx_vid_valid`	Output	P
`dp_rx_dp_sink_rx_parallel_data`	Input	N S10	DisplayPort parallel data from RX Native PHY Note: N = RX maximum lane count, S = RX symbols per clock
`dp_rx_dp_sink_rx_std_clkout`	Input	N	CDR clock out from RX Native PHY Note: N = RX maximum lane count
`dp_rx_dp_sink_rx_restart`	Output	1	Reset signal to RX Native PHY Reset controller when RX data loses alignment. Triggered by the DisplayPort RX core.
`dp_rx_dp_sink_rx_reconfig_req`	Output	1	Transceiver reconfiguration interface to the RX reconfiguration management module Note: N = RX maximum lane count
`dp_rx_dp_sink_rx_reconfig_ack`	Input	1
`dp_rx_dp_sink_rx_reconfig_busy`	Input	1
`dp_rx_dp_sink_rx_bitslip`	Output	N
`dp_rx_dp_sink_rx_cal_busy`	input	N
`dp_rx_dp_sink_rx_analogreset`	Output	N
`dp_rx_dp_sink_rx_digitalreset`	Output	N
`dp_rx_dp_sink_rx_is_lockedtoref`	Input	N
`dp_rx_dp_sink_rx_is_lockedtodata`	Input	N
`dp_rx_dp_sink_rx_set_locktoref`	Output	N
`dp_rx_dp_sink_rx_set_locktodata`	Output	N
DisplayPort TX Signals
`dp_tx_reset_bridge_in_reset_n`	Input	1	Reset to TX sub-system
`dp_tx_clk_16_in_clk`	Input	1	TX Auxiliary clock (16 MHz)
`dp_tx_dp_source_clk_cal`	Input	1	TX reconfiguration calibration clock
`dp_tx_dp_source_tx_audio_valid`	Input	1	TX audio channel interface Note: M = TX audio channel
`dp_tx_dp_source_tx_audio_mute`	Input	1
`dp_tx_dp_source_tx_audio_lpcm_data`	Input	M*32
`dp_tx_dp_source_tx_audio_clk`	Input	1
`dp_tx_dp_source_tx_aux_in`	Input	1	TX auxiliary interface
`dp_tx_dp_source_tx_aux_out`	Output	1
`dp_tx_dp_source_tx_aux_oe`	Output	1
`dp_tx_dp_source_tx_hpd`	Input	1	TX HPD
`dp_tx_dp_source_tx_link_rate`	Output	2	TX Link Rate 2-bit indicator, used in transceiver reconfiguration management RBR: 2‘b00 HBR: 2‘b01 HBR2: 2‘b10 HBR3: 2'b11
`dp_tx_dp_source_tx_link_rate_8bits`	Output	8	TX Link Rate 8-bit indicator, used in transceiver reconfiguration management RBR: 0x06 HBR: 0x0A HBR2: 0x14 HBR3: 0x1E
`dp_tx_dp_source_tx_ss_ready`	Output	1	DisplayPort TX secondary stream interface
`dp_tx_dp_source_tx_ss_valid`	Input	1
`dp_tx_dp_source_tx_ss_data`	Input	128
`dp_tx_dp_source_tx_ss_sop`	Input	1
`dp_tx_dp_source_tx_ss_eop`	Input	1
`dp_tx_dp_source_tx_ss_clk`	Output	1
`dp_tx_dp_source_tx_vid_clk`	Input	1	DisplayPort TX video stream (VYSNC/HSYNC/DE) interface (only used when `TX_SUPPORT_IM_ENABLE` = 0) Note: B = TX bits per component, P = TX pixels per clock.
`dp_tx_dp_source_tx_vid_data`	Input	BP3
`dp_tx_dp_source_tx_vid_v_sync`	Input	P
`dp_tx_dp_source_tx_vid_h_sync`	Input	P
`dp_tx_dp_source_tx_vid_de`	Input	P
`dp_tx_dp_source_tx_im_clk`	Input	1	DisplayPort TX video image interface (only used when `TX_SUPPORT_IM_ENABLE` = 1) Note: B = TX bits per component, P = TX pixels per clock.
`dp_tx_dp_source_tx_im_sol`	Input	1
`dp_tx_dp_source_tx_im_eol`	Input	1
`dp_tx_dp_source_tx_im_sof`	Input	1
`dp_tx_dp_source_tx_im_eof`	Input	1
`dp_tx_dp_source_tx_im_data`	Input	BP3
`dp_tx_dp_source_tx_im_valid`	Input	1
`dp_tx_dp_source_tx_im_locked`	Input	1
`dp_tx_dp_source_tx_im_interlace`	Input	1
`dp_tx_dp_source_tx_im_field`	Input	1
`dp_tx_dp_source_tx_parallel_data`	Output	NS10	DisplayPort parallel data to TX Native PHY Note: N = TX maximum lane count, S = TX symbols per clock
`dp_tx_dp_source_tx_std_clkout`	Input	N	TX Native PHY clock out Note: N = TX maximum lane count
`dp_tx_dp_source_tx_pll_locked`	Input	1	TX PLL locked indicator
`dp_tx_dp_source_tx_reconfig_req`	Output	1	Transceiver Reconfiguration interface to TX reconfiguration management module Note: N = TX maximum lane count
`dp_tx_dp_source_tx_reconfig_ack`	Input	1
`dp_tx_dp_source_tx_reconfig_busy`	Input	1
`dp_tx_dp_source_tx_pll_powerdown`	Output	1
`dp_tx_dp_source_tx_analog_reconfig_req`	Output	1
`dp_tx_dp_source_tx_analog_reconfig_ack`	Input	1
`dp_tx_dp_source_tx_analog_reconfig_busy`	Input	1
`dp_tx_dp_source_tx_vod`	Output	N*2
`dp_tx_dp_source_tx_emp`	Output	N*2
`dp_tx_dp_source_tx_analogreset`	Output	N
`dp_tx_dp_source_tx_digitalreset`	Output	N
`dp_tx_dp_source_tx_cal_busy`	Input	N

Table 16. RX PHY Top-Level Signals
Signal	Direction	Width	Description
`rx_cdr_refclk`	Input	1	RX Native PHY CDR reference clock. This design example uses 135 MHz.
`dp_rx_clk_cal`	Output	1	50 MHz DisplayPort RX reconfiguration calibration clock. This clock must be synchronous to `rcfg_mgmt_clk`.
`rx_cdr_resetn`	Input	1	RX Native PHY reset (active low)
`video_pll_locked`	Input	1	This signal indicates that the video PLL (video clock and clk16) is stable and locked. Use as reset to the DisplayPort Intel® FPGA IP and the transceiver.
`dp_rx_link_rate_8bits`	Input	8	RX link rate indicator, used in transceiver reconfiguration management
`rx_rcfg_mgmt_reset`	Input	1	RX reconfiguration reset
`rx_rcfg_mgmt_clk`	Input	1	RX reconfiguration management clock (100 MHz)
`rx_rcfg_en`	Output	1	RX reconfiguration enable signal
`rx_rcfg_write`	Output	1	Reconfiguration Avalon® memory-mapped interfaces that interact with Transceiver Arbiter Note: N = RX maximum lane count (1, 2, or 4)
`rx_rcfg_read`	Output	1
`rx_rcfg_address`	Output	12
`rx_rcfg_writedata`	Output	32
`rx_rcfg_readdata`	Input	32
`rx_rcfg_waitrequest`	Input	1
`rx_rcfg_cal_busy`	Input	N
`gxb_rx_rcfg_write`	Input	N	Reconfiguration Avalon® memory-mapped interfaces from Transceiver Arbiter Note: N = RX maximum lane count (1, 2, or 4)
`gxb_rx_rcfg_read`	Input	N
`gxb_rx_rcfg_address`	Input	N*10
`gxb_rx_rcfg_writedata`	Input	N*32
`gxb_rx_rcfg_readdata`	Output	N*32
`gxb_rx_rcfg_waitrequest`	Output	N
`gxb_rx_rcfg_cal_busy`	Output	N
`gxb_rx_clkout`	Output	N	RX Native PHY CDR clock out Note: N = RX maximum lane count (1, 2, or 4)
`gxb_rx_serial_data`	Input	N	DisplayPort Serial Data to RX Native PHY Note: N = RX maximum lane count (1, 2, or 4)
`dp_rx_parallel_data`	Output	NS10	DisplayPort parallel data to DisplayPort RX core Note: N = RX maximum lane count (1, 2, or 4), S = RX symbols per clock (2 or 4)
`dp_rx_restart`	Input	1	Reset signal to the RX Native PHY Reset controller when RX data loses alignment. Triggered by the DisplayPort RX core.
`dp_rx_rcfg_req`	Input	1	Transceiver Reconfiguration interface from the DisplayPort RX core Note: N = RX maximum lane count (1, 2, or 4)
`dp_rx_rcfg_ack`	Output	1
`dp_rx_rcfg_busy`	Output	1
`dp_rx_is_lockedtoref`	Output	N
`dp_rx_is_lockedtodata`	Output	N
`dp_rx_bitslip`	Input	N
`dp_rx_cal_busy`	Output	1
`dp_rx_set_locktoref`	Input	N
`dp_rx_set_locktodata`	Input	N

Table 17. TX PHY Top-Level Signals
Signal	Direction	Width	Description
`tx_pll_refclk`	Input	1	TX transceiver PLL reference clock. This design example uses 135 MHz.
`dp_tx_clk_cal`	Output	1	50 MHz DisplayPort TX reconfiguration calibration clock. This clock must be synchronous to `rcfg_mgmt_clk`.
`tx_pll_resetn`	Input	1	TX transceiver PLL reset (active low)
`video_pll_locked`	Input	1	This signal indicates that the video PLL (video clock and clk16) is stable and locked. Use as reset to the DisplayPort Intel® FPGA IP and the transceiver.
`tx_cad`	Output	1	Driven to FMC card TX CAD. Tied to 0.
`dp_tx_link_rate_8bits`	Input	8	TX Link Rate indicator, used in transceiver reconfiguration management. RBR: 0x06 HBR: 0x0A HBR2: 0x14 HBR3: 0x1E
`tx_rcfg_mgmt_reset`	Input	1	TX reconfiguration reset
`tx_rcfg_mgmt_clk`	Input	1	TX reconfiguration management clock (100 MHz)
`tx_rcfg_en`	Output	1	TX reconfiguration enable signal
`tx_rcfg_write`	Output	1	Reconfiguration Avalon® memory-mapped interfaces to Transceiver Arbiter Note: N = TX maximum lane count (1, 2, or 4)
`tx_rcfg_read`	Output	1
`tx_rcfg_address`	Output	12
`tx_rcfg_writedata`	Output	32
`tx_rcfg_readdata`	Input	32
`tx_rcfg_waitrequest`	Input	1
`tx_rcfg_cal_busy`	Input	N
`gxb_tx_rcfg_write`	Input	N	Reconfiguration Avalon® memory-mapped interfaces from Transceiver Arbiter Note: N = TX maximum lane count (1, 2, or 4)
`gxb_tx_rcfg_read`	Input	N
`gxb_tx_rcfg_address`	Input	N*10
`gxb_tx_rcfg_writedata`	Input	N*32
`gxb_tx_rcfg_readdata`	Output	N*32
`gxb_tx_rcfg_waitrequest`	Output	N
`gxb_tx_rcfg_cal_busy`	Output	N
`gxb_tx_clkout`	Output	N	Transceiver clock out Note: N = TX maximum lane count (1, 2, or 4)
`gxb_tx_serial_data`	Output	N	DisplayPort Serial Data from Transceiver Note: N = TX maximum lane count
`dp_tx_parallel_data`	Input	NS10	DisplayPort Parallel Data from DisplayPort TX Core Note: N = TX maximum lane count (1, 2, or 4), S = TX symbols per clock (2 or 4)
`dp_tx_rcfg_req`	Input	1	Transceiver Reconfiguration interface from DisplayPort TX Core Note: N = TX maximum lane count (1, 2, or 4)
`dp_tx_rcfg_ack`	Output	1
`dp_tx_rcfg_vod`	Input	8
`dp_tx_rcfg_emp`	Input	8
`dp_txpll_rcfg_req`	Input	1
`dp_txpll_rcfg_ack`	Output	1
`dp_tx_rcfg_busy`	Output	1
`dp_txpll_powerdown`	Input	1
`dp_tx_cal_busy`	Output	N
`dp_txpll_locked`	Output	1

Table 18. Transceiver Arbiter Signals
Signal	Direction	Width	Description
`clk`	Input	1	Reconfiguration clock. This clock must share the same clock with the reconfiguration management blocks.
`reset`	Input	1	Reset signal. This reset must share the same reset with the reconfiguration management blocks.
`rx_rcfg_en`	Input	1	RX reconfiguration enable signal
`tx_rcfg_en`	Input	1	TX reconfiguration enable signal
`rx_rcfg_ch`	Input	2	Indicates which channel to be reconfigured on the RX core. This signal must always remain asserted.
`tx_rcfg_ch`	Input	2	Indicates which channel to be reconfigured on the TX core. This signal must always remain asserted.
`rx_reconfig_mgmt_write`	Input	1	Reconfiguration Avalon® memory-mapped interfaces from the RX reconfiguration management
`rx_reconfig_mgmt_read`	Input	1
`rx_reconfig_mgmt_address`	Input	10
`rx_reconfig_mgmt_writedata`	Input	32
`rx_reconfig_mgmt_readdata`	Output	32
`rx_reconfig_mgmt_waitrequest`	Output	1
`tx_reconfig_mgmt_write`	Input	1	Reconfiguration Avalon® memory-mapped interfaces from the TX reconfiguration management
`tx_reconfig_mgmt_read`	Input	1
`tx_reconfig_mgmt_address`	Input	10
`tx_reconfig_mgmt_writedata`	Input	32
`tx_reconfig_mgmt_readdata`	Output	32
`tx_reconfig_mgmt_waitrequest`	Output	1
`reconfig_write`	Output	1	Reconfiguration Avalon® memory-mapped interfaces to the transceiver
`reconfig_read`	Output	1
`reconfig_address`	Output	10
`reconfig_writedata`	Output	32
`rx_reconfig_readdata`	Input	32
`rx_reconfig_waitrequest`	Input	1
`tx_reconfig_readdata`	Input	1
`tx_reconfig_waitrequest`	Input	1
`rx_cal_busy`	Input	1	Calibration status signal from the RX transceiver
`tx_cal_busy`	Input	1	Calibration status signal from the TX transceiver
`rx_reconfig_cal_busy`	Output	1	Calibration status signal to the RX transceiver PHY reset control
`tx_reconfig_cal_busy`	Output	1	Calibration status signal from the TX transceiver PHY reset control

Table 19. Pixel Clock Recovery Signals
The PCR module in the dynamic generation design example is an enhanced version where 2 Fractional PLLs (FPLLs) are used.
Signal	Direction	Width	Description
`areset`	Input	1	PCR reset
`clk`	Input	1	Control loop clock (16 MHz)
`clk_135`	Input	1	135 MHz clock
`rx_link_clk`	Input	1	RX Native PHY CDR clock out
`rx_link_rate`	Input	2	RX link rate 2-bit indicator
`rx_msa`	Input	217	RX MSA
`vidin_clk`	Input	1	RX video clock. If `MAX_LINK_RATE` = HBR2 and `PIXELS_PER_CLOCK` = Dual, uses 300 MHz. Otherwise, fixed to 160 MHz.
`vidin_data`	Input	BP3	RX video stream interface from RX core Note: B = RX bits per component, P = RX pixels per clock.
`vidin_valid`	Input	1
`vidin_locked`	Input	1
`vidin_sof`	Input	1
`vidin_eof`	Input	1
`vidin_sol`	Input	1
`vidin_eol`	Input	1
`rec_clk`	Output	1	Reconstructed/recovered video clock
`rec_clk_x2`	Output	1	Reconstructed/recovered video clock (2x faster); not used
`vidout`	Output	BP3	TX video stream interface Note: B = TX bits per component, P = TX pixels per clock.
`hsync`	Output	1
`vsync`	Output	1
`de`	Output	1
`field2`	Output	1

Table 20. Pixel Clock Recovery ParametersYou can use these parameters to configure the clock recovery core.
Parameter	Default Value	Description
`PIXELS_PER_CLOCK`	1	Specifies how many pixels in parallel (for each clock cycle) are gathered from the DisplayPort RX core (1, 2 or 4).
`BPP`	24	Specifies the width (in bits) of a single pixel. 1 bit per pixel is equivalent to 3* bits per component.
`CLK_PERIOD_NS`	10	Specifies the period (in nanoseconds) of the clock signal connected to the port. In this design example, the value used is 62.
`DEVICE_FAMILY`	Cyclone 10 GX	Identifies the family of the device used.
`FIXED_NVID`	0	Specifies the configuration of the DisplayPort RX received video clocking used. 1 if GPU NVID is fixed to 'h8000 0 if GPU NVID is not fixed Select 0 if you require the PCR to inter-operate with any GPU. Select 1 if you want to optimize resources but take note that this option may not work with certain GPUs.

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DisplayPort Cyclone® 10 GX FPGA IP Design Example User Guide

2.7. Interface Signals and Parameter