Altera 50G Interlaken MegaCore Function User Manual
Page 84
Out-of-Band Flow Control in the 50G Interlaken
MegaCore Function
10
2015.05.04
UG-01140
The 50G Interlaken MegaCore function includes logic to provide the out-of-band flow control function‐
ality described in the Interlaken Protocol Specification, Revision 1.2, Section 5.3.4.2. This optional feature is
intended for applications that require transmission rate control.
Figure 10-1: Out-of-Band Flow Control Block Interface
This figure lists the signals on the four interfaces of the out-of-band flow control block.
TX Out-of-Band
Flow Control
RX Out-of-Band
Flow Control
tx.fc_clk
tx.fc_sync
tx.fc_data
rx.fc_clk
rx.fc_sync
rx.fc_data
double_fc_clk
double_fc_arst
ena_status
lane_status
link_status
calendar
status_update
lane_status
link_status
status_error
calendar
calendar_update
calendar_error
Out-of-Band
Flow Control
Application
Signals
Out-of-Band
Flow Control
Interface
sys_clk
sys_arst
The out-of-band flow control block is provided as two separate modules that can be stitched to the
50G Interlaken IP core and user logic. You can optionally instantiate these blocks in your own custom
logic. To enable the use of these out-of-band modules, the signals on the far left side of the figure must be
connected to user logic, and the signals on the far right side of the figure should be connected to the
complementary flow control blocks of the Interlaken link partner.
You must connect the out-of-band flow control receive and transmit interface signals to device pins.
Out-of-Band Flow Control Block Clocks
TX Out-of-Band Flow Control Signals
RX Out-of-Band Flow Control Signals
on page 10-4
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