Altera Interlaken MegaCore Function - Manual (Page 60)

5–8 Chapter 5: Signals
Out-of-Band Flow Control Interface Signals
Interlaken MegaCore Function June 2012 Altera Corporation
User Guide
Out-of-Band Flow Control Interface Signals
The out-of-band flow control interface is present only in Interlaken MegaCore
function variations that include an out-of-band flow control block.
Table 5–9 and
Table 5–11 describe the out-of-band flow control interface signals.
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.
Table 5–9 describes
the receive out-of-band flow control interface signals specified in the Interlaken
Protocol Definition, Revision 1.2.
Table 5–10 describes the signals on the application side
of the RX out-of-band flow control block.
tx_control_burst_max_in[3:0] Input
Holds the next value of the BurstMax Interlaken parameter for dynamic
configuration. The Interlaken MegaCore function supports the following
valid values for BurstMax:
■ 128 bytes, specified with tx_control_burst_max_in == 2.
■ 256 bytes, specified with tx_control_burst_max_in == 4.
This signal is present only if you enable dynamic configuration of the
Interlaken burst parameters in the Interlaken parameter editor.
tx_control_burst_short_in
[3:0]
Input
Holds the next value of the BurstShort Interlaken parameter for dynamic
configuration. The Interlaken MegaCore function supports the following
valid values for BurstShort in Interlaken variations that support dynamic
configuration of BurstShort:
■ 32 bytes, specified with tx_control_burst_short_in == 2.
■ 64 bytes, specified with tx_control_burst_short_in == 4.
This signal is present only if you enable dynamic configuration of the
Interlaken burst parameters in the Interlaken parameter editor. For
information about the Interlaken variations that support enabling
BurstShort dynamic configuration, refer to
“Burst Parameters” on
page 3–3 and “Interlaken Interface” on page 4–2 .
Note to Table 5–8 :
(1) The Interlaken MegaCore function supports two channels on the application interface. The string “chX” in a signal name indicates two distinct
signal names, one with “ch0” and one with “ch1”, corresponding to the two channels, channel 0 and channel 1.
Table 5–8. TX Application Interface SIgnals (1) (Part 2 of 2)
Signal Direction Description
Table 5–9. RX Out-of-Band Flow Control Interface Signals (Part 1 of 2)
Signal Direction Description
rx_oob_in_fc_clk (1) Input
Input reference clock from an upstream out-of-band TX block. This
signal clocks the rx_oob_in_fc_data and rx_oob_in_fc_sync
signals. You must connect this signal to a device pin. Refer to
“Out-of-Band Flow Control Block Recommended Clock Frequencies”
on page 4–11
.