50G Interlaken Intel® FPGA IP User Guide

ID 683217
Date 10/31/2022
Public
Document Table of Contents

9.2. TX Out‑of‑Band Flow Control Signals

The transmit out‑of‑band flow control interface receives calendar and status information, and transmits flow‑control clock, data, and sync signals. The TX Out-of-Band Flow Control Interface Signals table describes the transmit out‑of‑band flow control interface signals specified in the Interlaken Protocol Specification, Revision 1.2. The TX Out-of-Band Flow Control Block Signals for Application Use table describes the signals on the application side of the TX out‑of‑band flow control block.

Table 25.  TX Out-of-Band Flow Control Interface Signals

Signal Name

Direction

Width (Bits)

Description

fc_clk

Output

1

Output reference clock to a downstream out-of-band RX block. Clocks the fc_data and fc_sync signals. You must connect this signal to a device pin.

fc_data

Output

1

Output serial data pin to a downstream out-of-band RX block. You must connect this signal to a device pin.

fc_sync

Output

1

Output sync control pin to a downstream out-of-band RX block. You must connect this signal to a device pin.

Table 26.  TX Out-of-Band Flow Control Block Signals for Application Use

Signal Name

Direction

Width (Bits)

Description

double_fc_clk

Input

1

Reference clock for generating the flow control output clock fc_clk. The frequency of the double_fc_clk clock must be double the intended frequency of the TX fc_clk output clock.

double_fc_arst

Input

1

Asynchronous reset for the out-of-band TX block.

ena_status

Input

1

Enable transmission of the lane status and link status to the downstream out-of-band RX block. If this signal is asserted, the lane and link status information is transmitted on fc_data. If this signal is not asserted, only the calendar information is transmitted on fc_data.

lane_status

Input

Number of Lanes

Lane status to be transmitted to a downstream out-of-band RX block if ena_status is asserted. Width is the number of lanes.

link_status

Input

1

Link status to be transmitted to a downstream out-of-band RX block if ena_status is asserted.

calendar

Input

16

Calendar status to be transmitted to a downstream out-of-band RX block.