Altera 50G Interlaken MegaCore Function User Manual
Page 53
Signal Name
Direction Width
(Bits)
Description
irx_sop
Output
1
Indicates the current data symbol on
irx_dout_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.
irx_
eopbits
Output
4
Indicates whether the current data symbol contains the end of a packet
(EOP) with or without an error, and specifies the number of valid bytes
in the current end-of-packet, non-error 8-byte data word, if relevant.
The IP core sets the value of
irx_eopbits
as follows:
• 4b’0000: no end of packet, no error.
• 4b’0001: Error and end of packet.
• 4b’1xxx: End of packet. xxx indicates the number of valid bytes in
the final valid 8-byte word of the packet, as follows:
• 3b’000: all 8 bytes are valid.
• 3b’001: 1 byte is valid.
• ...
• 3b’111: 7 bytes are valid.
All other values (4'b01xx, 4'b001x) are undefined and are not generated
by the IP core.
The valid bytes always start in bit positions [63:56] of the final valid
data word of the packet.
irx_sob
Output
1
Start of the burst. The 50G Interlaken IP core indicates the start of the
burst. The signal
irx_channel
is only valid when
irx_sob
is high. This
signal toggles in Packet Mode and in Interleaved Mode.
This signal has the following valid values:
• 1'b0—The current data symbol does not contain the start of a burst.
• 1'b1—The current data symbol contains the start of a burst.
irx_eob
Output
1
End of the burst. The 50G Interlaken IP core indicates the end of the
burst. This signal toggles in Packet Mode and in Interleaved Mode.
irx_dout_
words
Output
256
The four 64-bit words of output data (one data symbol). When
irx_
num_valid
has the value of zero, you should ignore
irx_dout_words
.
irx_
calendar
Output
16 × N Multiple pages (16 bits per page) of calendar output bits. The value is
the in-band flow control bits from N control words on the incoming
Interlaken link. N is the value of the Number of calendar pages
parameter, which can be any of 1, 2, 4, 8, or 16. This signal is synchro‐
nous with
rx_usr_clk
, although it is not part of the user data transfer
protocol.
UG-01140
2015.05.04
50G Interlaken IP Core User Data Transfer Interface Signals
5-7
50G Interlaken MegaCore Function Signals
Altera Corporation