100G Interlaken Intel® FPGA IP User Guide

ID 683338
Date 9/20/2022
Public

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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 30.  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 31.  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.