Altera Interlaken MegaCore Function Uživatelský manuál stáhnout pdf (Strana 57)

Chapter 5: Signals 5–5

Application Interface Signals

June 2012 Altera Corporation Interlaken MegaCore Function

User Guide

Application Interface Signals

The application interface provides two channels through which the application

receives data from and sends data to the Interlaken link. Table 5–5 through Table 5–8

describe the application interface signals.

RX Application Interface Signals

The RX application interface provides two channels through which the application

receives data from the Interlaken link.

Table 5–5 and Table 5–6 describe the RX application interface signals. For more

information about these signals, refer to “Packet Regrouper” on page 4–19.

Table 5–5. RX Application Interface Clock Signal

Signal Direction Description

rx_mac_c_clk

Input

Clocks the Interlaken MegaCore function MAC RX block and therefore, also, the RX

application interface.

For all MegaCore function variations except the 8-lane, 3.125-Gbps variations, Altera

recommends that you drive this signal with the

tx_coreclkout

signal (in variations with

transceivers), or that you drive this signal with the same clock that drives the

tx_lane_c_clk

signal (in variations without transceivers).

For the 8-lane, 3.125-Gbps variations, the

rx_mac_c_clk

clock should be driven by a

faster clock than the RX PCS clock. For these variations, Altera recommends that

rx_mac_c_clk

be driven by the same clock that drives the

tx_mac_c_clk

. For

recommended frequencies, refer to “Interlaken MegaCore Function Recommended Clock

Rates” on page 4–9.

Table 5–6. RX Application Data Interface Signals

(1)

(Part 1 of 2)

Signal Direction Description

rx_chX_dataout_data[W:0]

Output

Channel X data out. Streams the data received on the Interlaken interface

out on channel X. Width is 128 bits for variations that require the 20G/4L

license, 256 bits for variations that require the 40G/8L license, and 512

for variations that require one of the 100G licenses. For details, refer to

Table 4–5 on page 4–12. (W = width – 1).

rx_chX_dataout_valid

Output

Indicates data out on the current channel (

rx_chX_dataout_data

) is

valid in the current

rx_mac_c_clk

cycle.

rx_chX_dataout_startofpacket

Output

Indicates data out on the current channel in the current

rx_mac_c_clk

cycle includes a start-of-packet.

rx_chX_dataout_endofpacket

Output

Indicates data out on current channel in the current

rx_mac_c_clk

cycle includes an end-of-packet.

rx_chX_dataout_error

Output

Indicates an error occurred during transmission of the current packet on

rx_chX_datain_data

. This signal is valid only in an end-of-packet

cycle.

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 89 90

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