2.8. Interface Signals

Table 16. Top-Level Signals
Signal	Direction	Width	Description
On-board Oscillator Signal
`core_refclk_100`	Input	1	100 MHz free running clock for core reference clock.
`fgt_refclk_100`	Input	1	100 MHz free running clock for transceiver reference clock.
`core_refclk_148p5`	Input	1	148.5 MHz free running clock for core reference clock.
`fgt_refclk_148p5`	Input	1	148.5 MHz free running clock for transceiver reference clock for TMDS clock.
User Push Buttons and LEDs
`user_pb`	Input	1	Push button to control the HDMI Intel® FPGA IP design functionality.
`cpu_resetn`	Input	1	Global reset.
`user_led_g`	Output	8	Green LED display. Refer to Hardware Setup for more information about the LED functions.
`user_dipsw`	Input	1	User-defined DIP switch. Refer to Hardware Setup for more information about the DIP switch functions.
`fpga_sgpio_clk`	Input	1	SGPIO slave signals. These groups of signals connect to the MAX device to control the on-board LEDs.
`fpga_sgpio_sync`	Input	1
`fpga_sgpi`	Input	1
`fpga_sgpo`	Input	1
HDMI FMC Daughter Card Pins on FMC Port
`fmc_rx_p`	Input	4	HDMI RX clock, red, green, and blue data channels.
`fmc_tx_p`	Output	4	HDMI TX clock, red, green, and blue data channels.
`fmcb_la_rx_p_9`	Input	1	HDMI RX +5V power detect.
`fmcb_la_rx_p_8`	Input	1	HDMI RX hot plug detect.
`fmcb_la_rx_n_8`	Input	1	HDMI RX I²C SDA for DDC and SCDC.
`fmcb_la_tx_p_10`	Input	1	HDMI RX I²C SCL for DDC and SCDC.
`fmcb_la_tx_p_12`	Input	1	HDMI TX hot plug detect.
`fmcb_la_tx_n_12`	Input	1	HDMI I²C SDA for DDC and SCDC.
`fmcb_la_rx_p_10`	Input	1	HDMI I²C SCL for DDC and SCDC.
`fmcb_la_tx_n_9`	Input	1	HDMI I²C SDA for redriver control.
`fmcb_la_rx_p_11`	Input	1	HDMI I²C SCL for redriver control.

Table 17. HDMI RX Top-Level Signals
Signal	Direction	Width	Description
Clock and Reset Signals
`reset`	Input	1	System reset input.
`mgmt_clk`	Input	1	System clock input (100 MHz).
`rx_tmds_clk`	Input	1	HDMI RX TMDS clock.
`i2c_clk`	Input	1	Clock input for DDC and SCDC interface.
`rxphy_cdr_refclk`	Input	1	Clock input for RX CDR reference clock 1. The clock frequency is set 0 MHz in F-tile Reference and System PLL Clocks Intel FPGA IP to support variable tmds clock frequency values.
`rxphy_cdr_refclk_tmds`	Input	1	Clock input for RX CDR reference clock 1. The clock frequency is 148.5 MHz.
`systempll_clk`	Input		Clock input for RX PHY System PLL Clock.
`rx_vid_clk`	Output	1	Video clock output.
`sys_init`	Output	1	System initialization to reset the system upon power-up.
RX Transceiver and IOPLL Signals
`rxpll_tmds_locked`	Output	1	Indicates the TMDS clock IOPLL is locked.
`rxpll_frl_locked`	Output	1	Indicates the FRL clock IOPLL is locked.
`rxphy_serial_data`	Input	4	HDMI serial data to the RX PMA Direct PHY.
`rxphy_ready`	Output	1	Indicates the RX PMA Direct PHY is ready.
`rxphy_cal_busy_raw` ¹	Output	4	RX Native PHY calibration busy to the transceiver arbiter.
`rxphy_serial_data_n`	Input	4	HDMI serial data to the RX PMA Direct PHY.
`rxphy_cal_busy_gated`	Input	4	Calibration busy signal from the transceiver arbiter to the RX PMA Direct PHY.
RX Reconfiguration Management
`rxphy_rcfg_master_write`	Output	1	RX reconfiguration management Avalonmemory-mapped interface to transceiver arbiter.
`rxphy_rcfg_master_read`	Output	1
`rxphy_rcfg_master_address`	Output	12
`rxphy_rcfg_master_writedata`	Output	32
`rxphy_rcfg_master_readdata`	Input	32
`rxphy_rcfg_master_waitrequest`	Input	1
`rxphy_rcfg_master_new_cfg_applied`	Input	1
`rxphy_rcfg_master_readdata_valid`	Input	1
`rxphy_rcfg_master_new_cfg_applied_ack`	Input	1
`rxphy_rcfg_curr_profile_id`	Input	15	Profile ID from Dynamic Reconfiguration IP.
`rxphy_rcfg_busy`	Output	1	Indicate that reconfiguration is in progress.
`rx_tmds_freq`	Output	24	TMDS clock frequency measured by reconfiguration module.
`device_ready`	Input	1	Indicate device are ready and can start reconfiguration process.
`rxphy_rcfg_slave_read` ¹	Input	4	Transceiver reconfiguration Avalon® memory-mapped interface from the RX PMA Direct PHY to the transceiver arbiter.
`rxphy_rcfg_slave_address` ¹	Input	40
`rxphy_rcfg_slave_writedata` ¹	Input	128
`rxphy_rcfg_slave_readdata` ¹	Output	128
`rxphy_rcfg_slave_waitrequest` ¹	Output	4
`rxphy_rcfg_slave_write` ¹	Input	4
HDMI RX Core Signals
`rx_vid_clk_locked`	Input	1		Indicates `vid_clk` is stable.
`rxcore_frl_rate`	Output	4		Indicates the FRL rate that the RX core is running. 6: 12 Gbps 4 lanes
`rxcore_frl_locked`	Output	4		Each bit indicates the specific lane that has achieved FRL lock. FRL is locked when the RX core successfully performs alignment, deskew, and achieves lane lock. For 3-lane mode, lane lock is achieved when the RX core receives Scrambler Reset (SR) or Start-Super-Block (SSB) for every 680 FRL character periods for at least 3 times. For 4-lane mode, lane lock is achieved when the RX core receives Scrambler Reset (SR) or Start-Super-Block (SSB) for every 510 FRL character periods for at least 3 times.
`rxcore_frl_ffe_levels`	Output	4		Corresponds to the `FFE_level` bit in the SCDC 0x31 register bit [7:4] in the RX core.
`rxcore_frl_flt_ready`	Input	1		Asserts to indicate the RX is ready for the link training process to start. When asserted, the `FLT_ready` bit in the SCDC register 0x40 bit 6 is asserted as well.
`rxcore_frl_src_test_config`	Input	8	Specifies the source test configurations. The value is written into the SCDC Test Configuration register in the SCDC register 0x35.
`rxcore_tbcr`	Output	1	Indicates the TMDS bit to clock ratio; corresponds to the `TMDS_Bit_Clock_Ratio` register in the SCDC register 0x20 bit 1. When running in HDMI 2.0 mode, this bit is asserted. Indicates the TMDS bit to clock ratio of 40:1. When running in HDMI 1.4b, this bit is not asserted. Indicates the TMDS bit to clock ratio of 10:1. This bit is unused for FRL mode.
`rxcore_scrambler_enable`	Output	1	Indicates if the received data is scrambled; corresponds to the `Scrambling_Enable` field in the SCDC register 0x20 bit 0.
`rxcore_audio_de`	Output	1	HDMI RX core audio interfaces Refer to the Sink Interfaces section in the HDMI Intel FPGA IP User Guide for more information.
`rxcore_audio_data`	Output	256
`rxcore_audio_info_ai`	Output	48
`rxcore_audio_N`	Output	20
`rxcore_audio_CTS`	Output	20
`rxcore_audio_metadata`	Output	165
`rxcore_audio_format`	Output	5
`rxcore_aux_pkt_data`	Output	72	HDMI RX core auxiliary interfaces Refer to the Sink Interfaces section in the HDMI Intel FPGA IP User Guide for more information.
`rxcore_aux_pkt_addr`	Output	6
`rxcore_aux_pkt_wr`	Output	1
`rxcore_aux_data`	Output	72
`rxcore_aux_sop`	Output	1
`rxcore_aux_eop`	Output	1
`rxcore_aux_valid`	Output	1
`rxcore_aux_error`	Output	1
`rxcore_gcp`	Output	6	HDMI RX core sideband signals Refer to the Sink Interfaces section in the HDMI Intel FPGA IP User Guide for more information.
`rxcore_info_avi`	Output	123
`rxcore_info_vsi`	Output	61
`rxcore_locked`	Output	1	HDMI RX core video ports Note: N = pixels per clock Refer to the Sink Interfaces section in the HDMI Intel FPGA IP User Guide for more information.
`rxcore_vid_data`	Output	N*48
`rxcore_vid_vsync`	Output	N
`rxcore_vid_hsync`	Output	N
`rxcore_vid_de`	Output	N
`rxcore_vid_valid`	Output	1
`rxcore_vid_lock`	Output	1
`rxcore_mode`	Output	1	HDMI RX core control and status ports. Note: N = symbols per clock Refer to the Sink Interfaces section in the HDMI Intel FPGA IP User Guide for more information.
`rxcore_ctrl`	Output	N*6
`rxcore_color_depth_sync`	Output	2
`hdmi_5v_detect`	Input	1	HDMI RX 5V detect and hotplug detect. Refer to the Sink Interfaces section in the HDMI Intel FPGA IP User Guide for more information.
`hdmi_rx_hpd_n`	Output	1
`rx_hpd_trigger`	Input	1
I²C Signals
`hdmi_rx_i2c_sda`	Input	1	HDMI RX DDC and SCDC interface.
`hdmi_rx_i2c_scl`	Input	1	HDMI RX DDC and SCDC interface.
RX EDID RAM Signals
`edid_ram_access`	Input	1	HDMI RX EDID RAM access interface. Assert `edid_ram_access` when you want to write or read from the EDID RAM, else this signal should be kept low. When you assert `edid_ram_access`, the hotplug signal deasserts to allow write or read to the EDID RAM. When EDID RAM access is completed, you should deassert `edid_ram_assess` and the hotplug signal asserts. The source reads the new EDID due to the hotplug signal toggling.
`edid_ram_address`	Input	8
`edid_ram_write`	Input	1
`edid_ram_read`	Input	1
`edid_ram_readdata`	Output	8
`edid_ram_writedata`	Input	8
`edid_ram_waitrequest`	Output	1

Table 18. HDMI TX Top-Level Signals
Signal	Direction	Width	Description
Clock and Reset Signals
`mgmt_clk`	Input	1	System clock input (100 MHz).
`reset`	Input	1	System reset input.
`tx_tmds_clk`	Input	1	HDMI RX TMDS clock.
`txphy_refclk`	Input	1	Clock input for TX PLL reference clock 1. The clock frequency is 100 MHz.
`txphy_refclk_tmds`	Input	1	Clock input for TX PLL reference clock 1.The clock frequency is set 0 MHz in F-tile Reference and System PLL Clocks Intel FPGA IP to support variable tmds clock frequency values.
`tx_vid_clk`	Output	1	Video clock output.
`tx_frl_clk`	Output	1	FRL clock output.
`sys_init`	Input	1	System initialization to reset the system upon power-up.
`tx_init_done`	Input	1	TX initialization to reset the TX reconfiguration management block and transceiver reconfiguration interface.
`systempll_clk`	Input	1	Clock input for TX PHY System PLL Clock
TX Transceiver and IOPLL Signals
`txpll_frl_locked`	Output	1	Indicates the link speed clock and FRL clock IOPLL is locked.
`txfpll_locked`	Output	1	Indicates the TX PLL is locked.
`txphy_serial_data`	Output	4	HDMI serial data from the TX PMA Direct PHY.
`txphy_serial_data_n`	Output	4	HDMI serial data from the TX PMA Direct PHY.
`txphy_ready`	Output	1	Indicates the TX PMA Direct PHY is ready.
`txphy_cal_busy` ¹	Output	1	TX PMA Direct PHY calibration busy signal.
`txphy_cal_busy_raw` ¹	Output	4	Calibration busy signal to the transceiver arbiter.
`txphy_cal_busy_gated` ¹	Input	4	Calibration busy signal from the transceiver arbiter to the TX PMA Direct PHY.
`txphy_rcfg_busy` ¹	Output	1	Indicates the TX PHY reconfiguration is in progress.
`txphy_rcfg_slave_write` ¹	Input	4	Transceiver reconfiguration Avalon® memory-mapped interface from the TX PMA Direct PHY to the transceiver arbiter.
`txphy_rcfg_slave_read` ¹	Input	4
`txphy_rcfg_slave_address` ¹	Input	40
`txphy_rcfg_slave_writedata` ¹	Input	128
`txphy_rcfg_slave_readdata` ¹	Output	128
`txphy_rcfg_slave_waitrequest` ¹	Output	4
TX Reconfiguration Management
`tx_tmds_freq`	Input	24	HDMI TX TMDS clock frequency value (in 10 ms).
`tx_os` ¹	Output	2	Oversampling factor: 0: 1x oversampling 1: 2× oversampling 2: 8x oversampling
`txphy_rcfg_master_write` ¹	Output	1	TX reconfiguration management Avalon® memory-mapped interface to transceiver arbiter.
`txphy_rcfg_master_read` ¹	Output	1
`txphy_rcfg_master_address` ¹	Output	12
`txphy_rcfg_master_writedata` ¹	Output	32
`txphy_rcfg_master_readdata` ¹	Input	32
`txphy_rcfg_master_waitrequest` ¹	Input	1
`txphy_rcfg_master_new_cfg_applied`	Input	1
`txphy_rcfg_master_readdata_valid`	Input	1
`txphy_rcfg_master_new_cfg_applied_ack`	Output	1
`tx_reconfig_done` ¹	Output	1	Indicates that the TX reconfiguration process is completed.
`txphy_rcfg_curr_profile_id`	Input	15	Profile ID from Dynamic Reconfiguration IP.
`device_ready`	Input	1	Indicate device is ready and can start reconfiguration process.
HDMI TX Core Signals
`tx_vid_clk_locked`	Input	1	Indicates `vid_clk` is stable.
`txcore_ctrl`	Input	N*6	HDMI TX core control interfaces. Note: N = pixels per clock Refer to the Source Interfaces section in the HDMI Intel FPGA IP User Guide for more information.
`txcore_mode`	Input	1
`txcore_audio_de`	Input	1	HDMI TX core audio interfaces. Refer to the Source Interfaces section in the HDMI Intel FPGA IP User Guide for more information.
`txcore_audio_mute`	Input	1
`txcore_audio_data`	Input	256
`txcore_audio_info_ai`	Input	49
`txcore_audio_N`	Input	20
`txcore_audio_CTS`	Input	20
`txcore_audio_metadata`	Input	166
`txcore_audio_format`	Input	5
`txcore_aux_ready`	Output	1	HDMI TX core auxiliary interfaces. Refer to the Source Interfaces section in the HDMI Intel FPGA IP User Guide for more information.
`txcore_aux_data`	Input	72
`txcore_aux_sop`	Input	1
`txcore_aux_eop`	Input	1
`txcore_aux_valid`	Input	1
`txcore_gcp`	Input	6	HDMI TX core sideband signals. Refer to the Source Interfaces section in the HDMI Intel FPGA IP User Guide for more information.
`txcore_info_avi`	Input	123
`txcore_info_vsi`	Input	62
`txcore_i2c_master_write`	Input	1	TX I²C master Avalon® memory-mapped interface to I²C master inside the TX core. Note: These signals are available only when you turn on the Include I2C parameter.
`txcore_i2c_master_read`	Input	1
`txcore_i2c_master_address`	Input	4
`txcore_i2c_master_writedata`	Input	32
`txcore_i2c_master_readdata`	Output	32
`txcore_vid_data`	Input	N*48	HDMI TX core video ports. Note: N = pixels per clock Refer to the Source Interfaces section in the HDMI Intel FPGA IP User Guide for more information.
`txcore_vid_vsync`	Input	N
`txcore_vid_hsync`	Input	N
`txcore_vid_de`	Input	N
`txcore_vid_ready`	Output	1
`txcore_vid_overflow`	Output	1
`txcore_vid_valid`	Input	1
`txcore_frl_rate`	Input	4	SCDC register interfaces.
`txcore_frl_pattern`	Input	16
`txcore_frl_start`	Input	1
`txcore_scrambler_enable`	Input	1
`txcore_tbcr`	Input	1
I²C Signals
`nios_tx_i2c_sda_in`	Output	1	TX I²C Master interface for SCDC and DDC from the Nios® II processor to the output buffer. Note: If you turn on the Include I2C parameter, these signals is placed inside the TX core and is not visible at this level.
`nios_tx_i2c_scl_in`	Output	1
`nios_tx_i2c_sda_oe`	Input	1
`nios_tx_i2c_scl_oe`	Input	1
`nios_ti_i2c_sda_in`	Output	1	TX I²C Master interface from the Nios® II processor to the output buffer to control TI redriver on the Bitec HDMI 2.1 FMC daughter card.
`nios_ti_i2c_scl_in`	Output	1
`nios_ti_i2c_sda_oe`	Input	1
`nios_ti_i2c_scl_oe`	Input	1
`hdmi_tx_i2c_sda`	Input	1	TX I²C interfaces for SCDC and DDC interfaces from the output buffer to the HDMI TX connector.
`hdmi_tx_i2c_scl`	Input	1
`hdmi_tx_ti_i2c_sda`	Input	1	TX I²C interfaces from the output buffer to the TI redriver on the Bitec HDMI 2.1 FMC daughter card.
`hdmi_tx_ti_i2c_scl`	Input	1
Hotplug Detect Signals
`tx_hpd_req`	Output	1	HDMI TX hotplug detect interfaces.
`hdmi_tx_hpd_n`	Input	1
`tx_hpd_ack`	Input	1

Table 19. RX-TX Link Signals
Signal	Direction	Width	Description
`reset`	Input	1	System reset input.
`mgmt_clk`	Input	1	System clock input (100 MHz).
`loopback_mode`	Input	1	To select the mode for TX video data. 0 = video data from TPG 1 = video data from RX
`pll_pixel_refclk`	Input	1	Video Actual Pixel clock.
`vid_clk`	Input	1	HDMI video clock.
`rx_vid_lock`	Input	3	Indicates HDMI RX video lock status.
`rx_vid_valid`	Input	1	HDMI RX video interfaces.
`rx_vid_de`	Input	N
`rx_vid_hsync`	Input	N
`rx_vid_vsync`	Input	N
`rx_vid_data`	Input	N*48
`rx_aux_eop`	Input	1	HDMI RX auxiliary interfaces.
`rx_aux_sop`	Input	1
`rx_aux_valid`	Input	1
`rx_aux_data`	Input	72
`tx_vid_de`	Output	N	HDMI TX video interfaces. Note: N = pixels per clock
`tx_vid_hsync`	Output	N
`tx_vid_vsync`	Output	N
`tx_vid_data`	Output	N48*
`tx_vid_valid`	Output	1
`tx_vid_ready`	Input	1
`tx_aux_eop`	Output	1	HDMI TX auxiliary interfaces.
`tx_aux_sop`	Output	1
`tx_aux_valid`	Output	1
`tx_aux_data`	Output	72
`tx_aux_ready`	Input	1

Table 20. Platform Designer System Signals
Signal	Direction	Width	Description
`cpu_clk_in_clk_clk`	Input	1	CPU clock.
`cpu_rst_in_reset_reset`	Input	1	CPU reset.
`edid_ram_slave_translator_avalon_anti_slave_0_address`	Output	8	EDID RAM access interfaces.
`edid_ram_slave_translator_avalon_anti_slave_0_write`	Output	1
`edid_ram_slave_translator_avalon_anti_slave_0_read`	Output	1
`edid_ram_slave_translator_avalon_anti_slave_0_readdata`	Input	8
`edid_ram_slave_translator_avalon_anti_slave_0_writedata`	Output	8
`edid_ram_slave_translator_avalon_anti_slave_0_waitrequest`	Input	1
`hdmi_i2c_master_i2c_serial_sda_in`	Input	1	I²C Master interfaces from the Nios® II processor to the output buffer for DDC and SCDC control.
`hdmi_i2c_master_i2c_serial_scl_in`	Input	1
`hdmi_i2c_master_i2c_serial_sda_oe`	Output	1
`hdmi_i2c_master_i2c_serial_scl_oe`	Output	1
`redriver_i2c_master_i2c_serial_sda_in`	Input	1	I²C Master interfaces from the Nios® II processor to the output buffer for TI redriver setting configuration.
`redriver_i2c_master_i2c_serial_scl_in`	Input	1
`redriver_i2c_master_i2c_serial_sda_oe`	Output	1
`redriver_i2c_master_i2c_serial_scl_oe`	Output	1
`pio_in0_external_connection_export`	Input	32	Parallel input output interfaces. Bit 0: Connected to the `user_dipsw` signal to control EDID passthrough mode. Bit 1: TX HPD request Bit 2: TX transceiver ready Bits 3: TX reconfiguration done Bits 4–7: Reserved Bits 8–11: RX FRL rate Bit 12: RX TMDS bit clock ratio Bits 13–16: RX FRL locked Bits 17–20: RX FFE levels Bit 21: RX alignment locked Bit 22: RX video lock Bit 23: User push button 2 to read SCDC registers from external sink Bits 24–31: Reserved
`pio_out0_external_connection_export`	Output	32	Parallel input output interfaces. Bit 0: TX HPD acknowledgment Bit 1: TX initialization is done Bits 2–7: Reserved Bits 8–11: TX FRL rate Bits 12–27: TX FRL link training pattern Bit 28: TX FRL start Bits 29–31: Reserved
`pio_out1_external_connection_export`	Output	32	Parallel input output interfaces. Bit 0: RX EDID RAM access Bit 1: RX FLT ready Bits 2–7: Reserved Bits 8–15: RX FRL source test configuration Bits 16–31: Reserved

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F-Tile HDMI Intel® FPGA IP Design Example User Guide

2.8. Interface Signals