GTS Interlaken Intel® FPGA IP User Guide

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ID 819200
Date 3/31/2024
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Document Table of Contents
Document Table of Contents x
1. About the GTS Interlaken FPGA IP Core 2. Getting Started 3. Parameter Settings 4. Functional Description 5. Interface Signals 6. IP Registers A. GTS Interlaken FPGA IP User Guide Archives 7. Document Revision History for GTS Interlaken Intel FPGA IP User Guide
1. About the GTS Interlaken FPGA IP Core x
1.1. Features 1.2. Device Family Support 1.3. Device Speed Grade Support 1.4. Performance and Resource Utilization 1.5. Round-Trip Latency 1.6. Release Information
2. Getting Started x
2.1. Installing and Licensing Intel FPGA IPs 2.2. Generated File Structure 2.3. Specifying the IP Core Parameters and Options 2.4. Reference and System PLL CLock for Your IP Design 2.5. Simulating the IP Core 2.6. Compiling the Full Design and Programming the FPGA
2.1. Installing and Licensing Intel FPGA IPs x
2.1.1. Intel FPGA Evaluation Mode
4. Functional Description x
4.1. Data Path Flow 4.2. Modes of Operation 4.3. Performance 4.4. IP Reset 4.5. M20K ECC Support 4.6. Out-of-Band Flow Control
4.1. Data Path Flow x
4.1.1. Interlaken TX Path 4.1.2. Interlaken RX Path
4.1.1. Interlaken TX Path x
4.1.1.1. Transmit Path Blocks 4.1.1.2. In-Band Calendar Bits on Transmit Side
4.1.2. Interlaken RX Path x
4.1.2.1. Receive Path Blocks 4.1.2.2. In-Band Calendar Bits on Receive Side 4.1.2.3. RX Errored Packet Handling
4.1.2.3. RX Errored Packet Handling x
4.1.2.3.1. Example With Erroes and In-Band Calendar Bits
4.2. Modes of Operation x
4.2.1. Interleaved and Packet Modes 4.2.2. Multi-Segment Mode
4.2.1. Interleaved and Packet Modes x
4.2.1.1. Transmit User Data Interface Examples 4.2.1.2. Receive User Data Interface Examples
4.2.2. Multi-Segment Mode x
4.2.2.1. Multi-Segment Interface Example
5. Interface Signals x
5.1. Clock and Reset Interface Signals 5.2. Transmit User Interface Signals 5.3. Receive User Interface Signals 5.4. Management Interface Signals 5.5. Interlaken Link and Miscellaneous Signals
1. About the GTS Interlaken FPGA IP Core
2. Getting Started
3. Parameter Settings
4. Functional Description
5. Interface Signals
6. IP Registers
A. GTS Interlaken FPGA IP User Guide Archives
7. Document Revision History for GTS Interlaken Intel FPGA IP User Guide

5.5. Interlaken Link and Miscellaneous Signals

Table 23.  SERDES Pins
Signal Name Width (Bits) I/O Direction Available In Description
tx_pin Number of lanes Output Interlaken mode Each bit represents the differential pair on a TX Interlaken lane.
rx_pin Number of lanes Input Interlaken mode Each bit represents the differential pair on a RX Interlaken lane.
tx_pin_n Number of lanes Output Interlaken mode For the NRZ loopback example design, tx_pin_n drives data to rx_pin_n.
rx_pin_n Number of lanes Input Interlaken mode For the NRZ loopback example design, rx_pin_n receives data from tx_pin_n.
Table 24.  Real-Time Transmitter Status Signals
Signal Name 2 Width (Bits) I/O Direction Available In Description
tx_lanes_aligned 1 Output Interlaken mode Indicates whether all of the transmitter lanes are aligned and are ready to send traffic.
itx_overflow 1 Output Interlaken mode An error flag indicating that the Transmit buffer is currently overflowing. This signal is asserted for the duration of the overflow condition. It is asserted in the first clock cycle in which the overflow occurs, and remains asserted until the Transmit buffer pointers indicate that no overflow condition exists.
itx_underflow 1 Output Interlaken mode An error flag indicating that the Transmit buffer is currently underflowed. In normal operation, this signal may be asserted temporarily immediately after the Interlaken IP core comes out of reset.
Table 25.  Real-Time Receiver Status Signals
Signal Name 3 Width (Bits) I/O Direction Available In Description
rx_lanes_aligned 1 Output Interlaken mode Indicates whether all of the receiver lanes are aligned and are ready to receive traffic.
sync_locked Number of lanes Output Interlaken mode Receive lane has locked on the remote transmitter meta Frame. These signals are level signals: all bits are expected to stay high unless a problem occurs on the serial line.
word_locked Number of lanes Output Interlaken mode Receive lane has identified the 67-bit word boundaries in the serial stream. These signals are level signals: all bits are expected to stay high unless a problem occurs on the serial line.
crc24_err 1 Output Interlaken mode A CRC24 error flag covering both control word and data word. You can use this signal to count the number of CRC24 errors. This signal is asserted as a single cycle wide pulse.
crc32_err Number of lanes Output Interlaken mode An error flag indicating diagnostic CRC32 failures per lane. This signal is asserted as a single cycle wide pulse only for NRZ mode.
rg_overflow 1 Output Interlaken mode An error flag indicating that the Reassembly FIFO is currently overflowed. The Reassembly FIFO is the receiver FIFO that feeds directly to the user data interface.
sop_cntr_inc 1 Output Interlaken mode A pulse indicating that the IP core receiver user data interface received a start-of- packet (SOP). You can use this signal to increment a count of SOPs the application observes on the receive interface.
eop_cntr_inc 1 Output Interlaken mode A pulse indicating that the IP core receiver user data interface received an end-of-packet (EOP). You can use this signal to increment a count of EOPs the application observes on the receive interface.
sop_cntr_inc1 1 Output Interlaken mode A pulse indicating that the IP core receiver user data interface received a start-of- packet (SOP) on second segment chunk. You can use this signal to increment a count of SOPs the application observes on the receive interface.

This signal is only available in muti-segment mode of IP core variations.
eop_cntr_inc1 1 Output Interlaken mode A pulse indicating that the IP core receiver user data interface received an end-of-packet (EOP) on second segment chunk. You can use this signal to increment a count of EOPs the application observes on the receive interface.

This signal is only available in muti-segment mode of IP core variations.
rxfifo_fill_level RXFIFO_ADDR_WIDTH Output Interlaken mode The fill level of Reassembly FIFO, in uits of 64-bit words. The width of this signal is the value of the RXFIFO_ADDR_WIDTH parameter, which is 12 by default. You can use the signal to monitor when the RX assembly FIFO is empty.
Table 26.  Burst Control Settings
Signal Name Width (Bits) I/O Direction Available In Description
burst_max_in 4 Input Interlaken mode Encodes the BurstMax parameter for the IP core. The actual value of the BurstMax parameter must be a multiple of 64 bytes. While traffic is present, this input signal should remain static. However, when no traffic is present, you can modify the value of the burst_max_in signal to modify the BurstMax value of the IP core. The IP core supports the following valid values for this signal:
  • 4'b0010: 128 bytes, words supported = 4 and 8
  • 4'b0100: 256 bytes, words supported = 4 and 8
burst_short_in 4 Input Interlaken mode Encodes the BurstShort parameter for the IP core. The IP core supports the following valid value for this parameter:
  • 4'b0001: 32 bytes
  • 4'b0010: 64 bytes
In general, the presence of the BurstMin parameter makes the BurstShort parameter obsolete.
burst_min_in 4 Input Interlaken mode Encodes the BurstMin parameter for the IP core. The IP core supports the following valid values for this signal:

  • 4'b0000: Disable optional enhanced scheduling. If you disable enhanced scheduling, performance is non-optimal.

  • 4'b0001: 32 bytes, words supported = 4

  • 4'b0010: 64 bytes, words supported = 4 and 8

  • 4'b0100: 128 bytes, words supported = 4 and 8

The BurstMin parameter should have a value that is less than or equal to half of the value of the BurstMax parameter.

Intel® recommends that you modify the value of this input signal only when no traffic is present on the TX user data interface. You do not need to reset the IP core.

Note: The burst_max_in value is ignored in the Interleaved mode.
Table 27.  ECC Status Signals
Signal Name Width (Bits) I/O Direction Available In Description
itx_eccstatus 2 Output Interlaken mode Indicates the TX ECC status.
  • Bit 1: Correctable error status
  • Bit 0: Uncorrectable error status
irx_eccstatus 2 Output Interlaken mode Indicates the RX ECC status.
  • Bit 1: Correctable error status
  • Bit 0: Uncorrectable error status
2 Synchronous with tx_usr_clk.
3 Synchronous with rx_usr_clk.
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