Altera Interlaken MegaCore Function Instrukcja Użytkownika Pobierz pdf (Strona 62)

5–10 Chapter 5: Signals

Out-of-Band Flow Control Interface Signals

Interlaken MegaCore Function June 2012 Altera Corporation

User Guide

TX Out-of-Band Flow Control Interface Signals

The transmit out-of-band flow control interface receives calendar and status

information, and transmits flow-control clock, data, and sync signals. Table 5–11

describes the transmit out-of-band flow control interface signals specified in the

Interlaken Protocol Definition, Revision 1.2. Table 5–12 describes the signals on the

application side of the TX out-of-band flow control block.

Table 5–11. TX Out-of-Band Flow Control Interface Signals

Signal Direction Description

tx_oob_out_clk

(1)

Output

Output reference clock for a downstream out-of-band RX block. This

signal clocks the

tx_oob_out_data

and

tx_oob_out_sync

signals. You must connect this signal to a device pin. Refer to

“Out-of-Band Flow Control Block Recommended Clock Frequencies”

on page 4–11.

tx_oob_out_data

Output

Output serial data pin for a downstream out-of-band RX block. You

must connect this signal to a device pin.

tx_oob_out_sync

Output

Output sync control pin for a downstream out-of-band RX block.

You must connect this signal to a device pin.

Note to Table 5–11:

(1) The maximum

tx_oob_out_clk

frequency allowed by the Interlaken specification is 100 MHz. Altera recommends that you run the

tx_oob_out_clk

clock at 100 MHz.

Table 5–12. TX Out-of-Band Flow Control Block Signals for Application Use

Signal Direction Description

tx_oob_in_double_fc_clk

(1)

Input

Reference clock for generating the flow control output clock

tx_oob_out_clk

. The frequency of the

tx_oob_in_double_fc_clk

clock must be double the intended

frequency of

tx_oob_out_clk

tx_oob_in_double_fc_arst

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

tx_oob_in_ena_status

Input

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

tx_oob_out_data

. If

this signal is not asserted, only the calendar information is

transmitted on

tx_oob_out_data

tx_oob_in_lane_status[L:0]

Input

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

tx_oob_in_ena_status

is asserted. Width is the number of

lanes (L = num_lanes – 1).

tx_oob_in_link_status

Input

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

tx_oob_in_ena_status

is asserted.

tx_oob_in_calendar[15:0]

Input

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

block.

Note to Table 5–12:

(1) Altera recommends that you run

tx_oob_in_double_fc_clk

at 200 MHz, to support the recommended (and maximum allowed)

tx_oob_out_clk

frequency of 100 MHz.

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 89 90

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