HC4GX15 Datasheet, PDF (514/668 Pages) Altera Corporation – HardCopy IV Device Handbook

2–56
Chapter 2: HardCopy IV GX Dynamic Reconfiguration
PMA Controls Reconfiguration
Figure 2–22 shows the read transaction waveform.
Figure 2–22. Method 1—Read Transaction Waveform
reconfig_clk
write_all
rx_tx_duplex_sel [1:0] (1)
2’b00
2’b10
logical_address_channel [1:0] (2)
2’b00
2’b01
busy
data_valid
tx_vodctrl [2:0]
3’b000
3’bXXX
3’b0
Notes to Figure 2–22:
(1) Consider that you want to read from only the transmitter portion of the channel.
(2) This waveform assumes that the number of channels connected to the dynamic reconfiguration controller is four. Therefore, the
logical_channel_address port is 2 bits wide.
1 Simultaneous write and read transactions are not allowed.
Method 2
Method 2 does not require the logical_channel_address port to dynamically
reconfigure the PMA controls of the transceiver channels. Using Method 2, the PMA
controls of all the transceiver channels connected to the ALTGX_RECONFIG instance
are reconfigured.
Method 2 is further classified into:
■ The Use the same control signal for all the channels option enabled
■ The Use the same control signal for all the channels option disabled
HardCopy IV Device Handbook, Volume 3
© June 2009 Altera Corporation