Altera Interlaken MegaCore Function - Manual (Page 62)

5–10 Chapter 5: Signals
Out-of-Band Flow Control Interface Signals
Interlaken MegaCore Function June 2012 Altera Corporation
User Guide
TX Out-of-Band Flow Control Interface Signals
The transmit out-of-band flow control interface receives calendar and status
information, and transmits flow-control clock, data, and sync signals.
Table 5–11
describes the transmit out-of-band flow control interface signals specified in the
Interlaken Protocol Definition, Revision 1.2.
Table 5–12 describes the signals on the
application side of the TX out-of-band flow control block.
Table 5–11. TX Out-of-Band Flow Control Interface Signals
Signal Direction Description
tx_oob_out_clk (1) Output
Output reference clock for a downstream out-of-band RX block. This
signal clocks the tx_oob_out_data and tx_oob_out_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
.
tx_oob_out_data Output
Output serial data pin for a downstream out-of-band RX block. You
must connect this signal to a device pin.
tx_oob_out_sync Output
Output sync control pin for a downstream out-of-band RX block.
You must connect this signal to a device pin.
Note to Table 5–11 :
(1) The maximum tx_oob_out_clk frequency allowed by the Interlaken specification is 100 MHz. Altera recommends that you run the
tx_oob_out_clk clock at 100 MHz.
Table 5–12. TX Out-of-Band Flow Control Block Signals for Application Use
Signal Direction Description
tx_oob_in_double_fc_clk (1) Input
Reference clock for generating the flow control output clock
tx_oob_out_clk
. The frequency of the
tx_oob_in_double_fc_clk clock must be double the intended
frequency of tx_oob_out_clk.
tx_oob_in_double_fc_arst Input Asynchronous reset for the out-of-band TX block.
tx_oob_in_ena_status Input
Enable transmission of the lane status and link status to the
downstream out-of-band RX block. If this signal is asserted, the lane
and link status information is transmitted on tx_oob_out_data. If
this signal is not asserted, only the calendar information is
transmitted on tx_oob_out_data.
tx_oob_in_lane_status[L:0] Input
Lane status to be transmitted to a downstream out-of-band RX block
if tx_oob_in_ena_status is asserted. Width is the number of
lanes (L = num_lanes – 1).
tx_oob_in_link_status Input
Link status to be transmitted to a downstream out-of-band RX block
if tx_oob_in_ena_status is asserted.
tx_oob_in_calendar[15:0] Input
Calendar status to be transmitted to a downstream out-of-band RX
block.
Note to Table 5–12 :
(1) Altera recommends that you run tx_oob_in_double_fc_clk at 200 MHz, to support the recommended (and maximum allowed)
tx_oob_out_clk frequency of 100 MHz.