User guide

Chapter 23: Switch MegaCore Function 23–5
Control Register Map
January 2013 Altera Corporation Video and Image Processing Suite
User Guide
Control Register Map
Table 23–4 describes the Switch MegaCore function control register map.
dout_N_startofpacket Out
dout_N port Avalon-ST startofpacket signal. This signal marks the
start of an Avalon-ST packet.
dout_N_valid Out
dout_N port Avalon-ST valid signal. This signal is asserted when the
MegaCore function outputs data.
Note to Table 23–3:
(1) These ports are present only when Alpha Enabled is turned on in the parameter editor.
Table 23–3. Switch Signals (Part 2 of 2)
Signal Direction Description
Table 23–4. Switch Control Register Map
Address Register(s) Description
0
Control
Writing a 1 to bit 0, starts the MegaCore function, writing a 0 to bit 0 stops the
MegaCore function.
1
Status
Reading a 1 from bit 0, indicates that the MegaCore function is running (video
is flowing through it), reading a 0 indicates that it is stopped.
2
Output Switch
Writing a 1 to bit 0, indicates that the video output streams must be
synchronized and then the new values in the output control registers must be
loaded.
3
Dout0 Output Control
A one-hot value that selects which video input stream must propagate to this
output. For example, for a 3 input switch:
■ 3'b000 = no output
■ 3'b001 = din_0
■ 3'b010 = din_1
■ 3'b100 = din_2
4
Dout1 Output Control As Dout0 Output Control but for output dout1 .
... ... ...
15
Dout12 Output Control As Dout0 Output Control but for output dout12 .