HC4GX15 Datasheet, PDF (525/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 2: HardCopy IV GX Dynamic Reconfiguration
2–67
Description of Transceiver Channel Reconfiguration Modes
Figure 2–30 shows a write transaction in Data Rate Division in TX mode.
Figure 2–30. Write Transaction in Data Rate Division in TX Mode
reconfig_mode_sel[2:0]
3'bXXX
3'b011
reconfig_clk
rate_switch_ctrl[1:0] (1)
logical_channel_address (2), (3)
write_all
2'bXX
2'bXX
2'b10
2'b01
2'bXX
2'bXX
busy
Notes to Figure 2–30:
(1) The waveform assumes that you want to reconfigure the local divider settings of the transmitter channel to “Divide by 4”. Therefore, the value set
at rate_switch_ctrl[1:0] is 2'b10.
(2) The waveform assumes that the value set in the What is the number of channels controlled by the reconfig controller? option of the
ALTGX_RECONFIG MegaWizard Plug-In Manager is 4. Therefore, the logical_channel_address input is 2 bits wide.
(3) The waveform also assumes that you want to reconfigure the local divider settings of the transmitter channel whose logical channel address is
2'b01.
Data Rate Division in TX: Read Transaction
1. Set the reconfig_mode_sel[2:0] signal to 3’b011 to activate this mode.
2. Select the rate_switch_out[1:0] signal to read out the existing TX local
divider settings.
3. Set the logical_channel_address port to the logical channel address of the
transmitter channel whose local divider settings you want to read.
4. Ensure that the busy signal is low.
5. Assert the read signal for one reconfig_clk cycle.
© June 2009 Altera Corporation
HardCopy IV Device Handbook, Volume 3