Altera 100G Interlaken MegaCore Function User Manual
Page 64
Signal Name
Direction Width
(Bits)
Description
itx_
calendar
Input
16 N
Multiple pages (16 bits per page) of calendar input bits. The
100G Interlaken IP Core copies these bits to the in-band flow control
bits in N control words that it sends on the 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 synchronous with
tx_usr_clk
, although
it is not part of the user data transfer protocol.
itx_ready
Output
1
Flow control signal to back pressure transmit traffic. When this signal
is high, you can send traffic to the IP core. When this signal is low, you
should stop sending traffic to the IP core within one to four cycles.
You can consider the inverse of
itx_ready
to be a FIFO-almost-full
indicator. In full duplex mode,
itx_ready
is low when
rx_lanes_
aligned
is low.
itx_ifc_
err
Output
1
Indicates the transmit side user data transfer interface received traffic
that the 100G Interlaken IP Core does not support. The IP core asserts
the
itx_ifc_err
signal in the following cases:
• In Interleaved mode, the IP core receives a burst that exceeds the
size of MaxBurst.
•
itx_sop
or
itx_sob
has the invalid value of 2'b11 in a valid data
cycle.
• Two instances of non-zero
itx_sop
(a start of packet), or two
instances of non-zero
itx_sob
(a start of burst), are separated by
fewer than 64 bytes.
The IP core asserts the
itx_ifc_err
signal for a single clock cycle. The
signal pulses within the current burst, with a delay of one or two cycles
after the error on the transmit side user data transfer interface.
100G Interlaken IP Core Receive User Interface
irx_chan
Output
8
Receive logic channel number. The IP core supports up to 256
channels. You should sample this value when a bit of
irx_sop
or
irx_
sob
is high and
irx_num_valid
has a non-zero value.
5-6
100G Interlaken IP Core User Data Transfer Interface Signals
UG-01128
2015.05.04
Altera Corporation
100G Interlaken MegaCore Function Signals