Altera 50G Interlaken MegaCore Function Instrukcja Użytkownika Pobierz pdf (Strona 85)

Related Information

Interlaken Protocol Specification, Revision 1.2

Out-of-Band Flow Control Block Clocks

Table 10-1: 50G Interlaken MegaCore Function Out-of-Band Flow Control Block Clocks

Clock Name Interface Direction Recommende

d Frequency

(MHz)

Description

RX fc_clk RX Out-of-

band

Input 100 Clocks the incoming out-of-band flow control

interface signals described in the Interlaken

specification. This clock is received from an

upstream TX out-of-band flow control block

associated with the Interlaken link partner. The

recommended frequency for the RX fc_clk clock

is 100 MHz, which is the maximum frequency

allowed by the Interlaken specification.

TX fc_clk TX Out-of-

band

Output 100 Clocks the outgoing out-of-band flow control

interface signals described in the Interlaken

specification. This clock is generated by the

out-of-band flow control block and sent to a

downstream RX out-of-band flow control block

associated with the Interlaken link partner. The

frequency of this clock must be half the frequency

of the double_fc_clk clock. The recommended

frequency for the TX fc_clk clock is 100 MHz,

which is the maximum frequency allowed by the

Interlaken specification.

sys_clk RX

Application

Input 200 Clocks the outgoing calendar and status informa‐

tion on the application side of the block. The

frequency of this clock must be at least double the

frequency of the RX input clock fc_clk.

Therefore, the recommended frequency for the

sys_clk clock is 200 MHz.

double_

fc_clk

Application

Input 200 Clocks the incoming calendar and status informa‐

tion on the application side of the block. The

frequency of this clock must be double the

frequency of the TX output clock fc_clk.

Therefore, the recommended frequency for the

double_fc_clk clock is 200 MHz.

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

10-2

Out-of-Band Flow Control Block Clocks

UG-01140

2015.05.04

Altera Corporation

Out-of-Band Flow Control in the 50G Interlaken MegaCore Function

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