Out-of-band flow control block clocks, Tx out‑of‑band flow control signals, Out-of-band flow control block clocks -2 – Altera 50G Interlaken MegaCore Function User Manual
Page 85: Tx out-of-band flow control signals -2, Tx out-of-band flow control signals
Related Information
Out-of-Band Flow Control Block Clocks
Table 10-1: 50G Interlaken MegaCore Function Out-of-Band Flow Control Block Clocks
Clock Name
Interface
Direction Recommende
d Frequency
(MHz)
Description
RX
fc_clk
RX Out-of-
band
Input
100
Clocks the incoming out-of-band flow control
interface signals described in the Interlaken
specification. This clock is received from an
upstream TX out-of-band flow control block
associated with the Interlaken link partner. The
recommended frequency for the RX
fc_clk
clock
is 100 MHz, which is the maximum frequency
allowed by the Interlaken specification.
TX
fc_clk
TX Out-of-
band
Output
100
Clocks the outgoing out-of-band flow control
interface signals described in the Interlaken
specification. This clock is generated by the
out-of-band flow control block and sent to a
downstream RX out-of-band flow control block
associated with the Interlaken link partner. The
frequency of this clock must be half the frequency
of the
double_fc_clk
clock. The recommended
frequency for the TX
fc_clk
clock is 100 MHz,
which is the maximum frequency allowed by the
Interlaken specification.
sys_clk
RX
Application
Input
200
Clocks the outgoing calendar and status informa‐
tion on the application side of the block. The
frequency of this clock must be at least double the
frequency of the RX input clock
fc_clk
.
Therefore, the recommended frequency for the
sys_clk
clock is 200 MHz.
double_
fc_clk
TX
Application
Input
200
Clocks the incoming calendar and status informa‐
tion on the application side of the block. The
frequency of this clock must be double the
frequency of the TX output clock
fc_clk
.
Therefore, the recommended frequency for the
double_fc_clk
clock is 200 MHz.
TX Out‑of‑Band Flow Control Signals
The transmit out-of-band flow control interface receives calendar and status information, and transmits
flow-control clock, data, and sync signals. The TX Out-of-Band Flow Control Interface Signals table
describes the transmit out-of-band flow control interface signals specified in the Interlaken Protocol
10-2
Out-of-Band Flow Control Block Clocks
UG-01140
2015.05.04
Altera Corporation
Out-of-Band Flow Control in the 50G Interlaken MegaCore Function