Altera 50G Interlaken MegaCore Function Manual de usuario descargar pdf (Pagina 50)

50G Interlaken IP Core User Data Transfer Interface Signals

Table 5-3: 50G Interlaken IP Core User Data Transfer Interface

Signal Name Direction Width

(Bits)

Description

50G Interlaken IP Core Transmit User Interface

itx_chan Input 8 Transmit logic channel number. The IP core supports up to 256

channels. The 50G Interlaken IP core samples this value only when

itx_sop or itx_sob is high and itx_num_valid has a non-zero value.

itx_num_

valid

Input 3 itx_num_valid[2:0] specifies the number of valid 64-bit words in the

current packet in the current data symbol. The maximum value of

itx_num_valid[2:0] is four, because a data symbol on the 256 bit

wide data path has four words (4 x 64 bits = 256 bits).

In non-valid cycles, you must set the value of itx_num_valid[2:0] to

zero.

In valid cycles, you must set the value of itx_num_valid[2:0] as

follows:

• 3’b100: if all four words contain valid data from the current packet.

• 3’b0xx: where xx indicates the number of valid words that are part

of the current packet, if the number is less than four. Data is always

MSB aligned (left aligned). For example, the value of 3’b011

indicates that word 0 (bit [63:0]) is not valid.

You must set the value of itx_num_valid to zero in all non-valid

cycles, even when itx_ready is not asserted.

itx_sop Input 1 Indicates the current data symbol on itx_din_words contains the start

of a packet (SOP). This signal has the following valid values:

• 1'b0—The current data symbol does not contain the start of a

packet.

• 1'b1—The current data symbol contains the start of a packet.

5-4

50G Interlaken IP Core User Data Transfer Interface Signals

UG-01140

2015.05.04

Altera Corporation

50G Interlaken MegaCore Function Signals

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