Altera Low Latency 40-Gbps Ethernet MAC and PHY MegaCore Bedienungsanleitung PDF herunterladen (Seite 55)

Related Information

Avalon Interface Specifications

For more information about the Avalon-ST interface.

Low Latency 40-100GbE IP Core TX Data Bus Without Adapters (Custom Streaming Interface)

When no adapters are used, the LL 40GbE custom interface bus width is 2 words (128 bits) and the LL

100GbE custom interface bus width is 4 words (256 bits). The LL 40GbE custom interface operates at

312.5 MHz and the LL 100GbE custom interface operates at 390.625 MHz.

Figure 3-6: TX Client to MAC Interface Without Adapters

The custom streaming interface bus width varies with the IP core variation. In the figure, <w> = 2 for the

40GbE IP core and <w> = 4 for the 100GbE IP core.

TX Client

Logic

din[<w>*64-1:0]

din_sop[<w>-1:0]

din_eop[<w>-1:0]

din_eop_empty[<w>*3-1:0]

din_req

tx_error[<w>-1:0]

clk_txmac

TX MAC

din_idle[<w>-1:0]

Table 3-3: Signals of the TX Client Interface Without Adapters

In the table, <w> = 2 for the 40GbE IP core and <w> = 4 for the 100GbE IP core. The signals are clocked by

clk_txmac.

Signal Name Direction Description

din[<w>*64-1:0]

Input Data bytes to send in big-endian mode.

Most significant 64-bit word is in the higher-order bits. In 40GbE

variations, the most significant word is in bits [127:64] and in 100GbE

variations, the most significant word is in bits [255:192].

The Low Latency 40-100GbE IP core does not process incoming

frames of less than nine bytes correctly. You must ensure such frames

do not reach the TX client interface.

din_sop[<w>-1:0]

Input Start of packet (SOP) location in the TX data bus. Only the most

significant byte of each 64-bit word may be a start of packet. Bit 63 or

127 are possible for the 40GbE and bits 255, 191, 127, or 63 are possible

for 100 GbE.

Bit 0 of din_sop corresponds to the data word in din[63:0].

3-10

Low Latency 40-100GbE IP Core TX Data Bus Without Adapters (Custom Streaming

Interface)

UG-01172

2015.05.04

Altera Corporation

Functional Description

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