3–16
Chapter 3: Cyclone IV Dynamic Reconfiguration
Dynamic Reconfiguration Modes
November 2011
Altera Corporation
shows the read transaction waveform for Method 1.
1
Simultaneous write and read transactions are not allowed.
Method 2: Writing the Same Control Signals to Control All the Transceiver
Channels
This method does not require the
logical_channel_address
port. The PMA controls
of all the transceiver channels connected to the ALTGX_RECONFIG instance are
reconfigured.
The
Use the same control signal for all the channels
option is available on the
Analog controls
tab of the ALTGX_RECONFIG MegaWizard Plug-In Manager. If you
enable this option, the width of the PMA control ports are fixed as follows:
PMA Control Ports Used in a Write Transaction
■
tx_vodctrl
is fixed to 3 bits
■
tx_preemp
is fixed to 5 bits
■
rx_eqdcgain
is fixed to 2 bits
■
rx_eqctrl
is fixed to 4 bits
Figure 3–5. Read Transaction Waveform—Use ‘logical_channel_address port’ Option
Notes to
(1) In this waveform example, you want to read from only the transmitter portion of the channel.
(2) In this waveform example, the number of channels connected to the dynamic reconfiguration controller is four. Therefore, the
logical_channel_address
port is 2 bits wide.
read
(2)
2'b00
2'b01
3'b111
3'bXXX
3'b001
busy
(1)
2'b00
2'b10
reconfig_clk
rx_tx_duplex_sel [1:0]
logical_channel_address [1:0]
data_
v
alid
tx_
v
odctrl_out [2:0]
Содержание Cyclone IV
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