Rx out-of-band flow control signals, Rx out-of-band flow control signals -4 – Altera 100G Interlaken MegaCore Function User Manual
Page 101
RX Out-of-Band Flow Control Signals
The receive out-of-band flow control interface receives input flow-control clock, data, and sync signals
and sends out calendar and status information. The RX Out-of-Band Flow Control Interface Signals table
describes the receive out-of-band flow control interface signals specified in the Interlaken Protocol Specifi‐
cation, Revision 1.2. The RX Out-of-Band Flow Control Block Signals for Application Use describes the
signals on the application side of the RX out-of-band flow control block.
Table 10-4: RX Out-of-Band Flow Control Interface Signals
Signal Name
Direction
Width
(Bits)
Description
fc_clk
Input
1
Input reference clock from an upstream out-of-band TX block. This
signal clocks the
fc_data
and
fc_sync
signals. You must connect this
signal to a device pin.
fc_data
Input
1
Input serial data pin from an upstream out-of-band TX block. You
must connect this signal to a device pin.
fc_sync
Input
1
Input sync control pin from an upstream out-of-band TX block. You
must connect this signal to a device pin.
Table 10-5: RX Out-of-Band Flow Control Block Signals for Application Use
Signal Name
Direction
Width
(Bits)
Description
sys_clk
Input
1
Reference clock for capturing RX calendar, lane status,
and link status. Frequency must be at least double the
frequency of the TX
fc_clk
input clock.
sys_arst
Input
1
Asynchronous reset for the out-of-band RX block.
status_update
Output
1
Indicates a new value without CRC4 errors is present on
at least one of
lane_status
or
link_status
in the
current
sys_clk
cycle. The value is ready to be read by
the application logic.
lane_status
Output
Number of
Lanes
Lane status bits received from an upstream out-of-band
TX block on
fc_data
. Width is the number of lanes.
link_status
Output
1
Link status bit received from an upstream out-of-band
TX block on
fc_data
.
status_error
Output
1
Indicates corrupt lane or link status. A new value is
present on at least one of
lane_status
or
link_status
in the current
sys_clk
cycle, but the value has at least
one CRC4 error.
10-4
RX Out-of-Band Flow Control Signals
UG-01128
2015.05.04
Altera Corporation
Out-of-Band Flow Control in the 100G Interlaken MegaCore Function