Altera DisplayPort MegaCore Function - Manual (Page 27)

Table 4-8: TX Transceiver Interface
n
is the number of TX lanes,
s
is the number of symbols per clock.
Note: Connect the DisplayPort signals to the Native PHY signals of the same name.
Interface Port Type Clock
Domain
Port Direction Description
TX transceiver
interface
Clock N/A
tx_std_clkout[n–1:0]
Input TX transceiver clock
out
Conduit
tx_std_
clkout
tx_parallel_
data[n*s*10–1:0]
Output Parallel data for TX
transceiver
Conduit N/A
tx_pll_powerdown
Output PLL power down for
TX transceiver
Conduit
xcvr_mgmt_
clk
tx_digitalreset[n–
1:0]
Output Resets the digital TX
portion of TX
transceiver
Conduit N/A
tx_analogreset[n–
1:0]
Output Resets the analog TX
portion of TX
transceiver
Conduit N/A
tx_cal_busy[n–1:0]
Input Calibration in
progress signal from
TX transceiver
Conduit N/A
tx_pll_locked
Input PLL locked signal
from TX transceiver
Controller Interface
The controller interface allows you to control the source from an external or on-chip controller, such as
the Nios II processor. The controller can control the DisplayPort link parameters and the AUX channel
controller.
The AUX channel controller interface works with a simple serial-port-type peripheral that operates in a
polled mode. Because the DisplayPort AUX protocol is a master-slave interface, the DisplayPort source
(the master) starts a transaction by sending a request and then waits for a reply from the attached sink.
The controller interface includes a single interrupt source. The interrupt notifies the controller of an HPD
signal state change. Your system can interrogate the
DP_TX_STATUS
register to determine the cause of the
interrupt. Writing to the
DP_TX_STATUS
register clears the pending interrupt event.
Related Information
• Multiplexer on page 4-4
• DisplayPort Source Register Map and DPCD Locations on page 9-1
DisplayPort source instantiations require an embedded controller (Nios II processor or another
controller) to act as the policy maker.
UG-01131
2015.05.04
Controller Interface 4-11
DisplayPort Source Altera Corporation
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