HC4GX15 Datasheet, PDF (526/668 Pages) Altera Corporation – HardCopy IV Device Handbook

2–68
Chapter 2: HardCopy IV GX Dynamic Reconfiguration
Description of Transceiver Channel Reconfiguration Modes
Figure 2–31 shows a read transaction waveform in Data Rate Division in TX mode.
Figure 2–31. Read Transaction in Data Rate Division in TX Mode
reconfig_mode_sel[2:0]
3'bXXX
reconfig_clk
3'b011
logical_channel_address (1), (2)
2'bXX
2'b01
2'bXX
read
busy
rate_switch_out[1:0] (3)
2'bXX
Invalid output
2'b01
data_valid
Notes to Figure 2–31:
(1) The waveform assumes that the existing local divider settings of the transmitter channel are “Divide by 2”. Therefore, the value read out at
rate_switch_out[1:0] is 2'b01.
(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 assumes that you want to read the existing local divider settings of the transmitter channel whose logical channel address is 2'b01.
1 Do not perform a read transaction in Date Rate Division in TX mode if
rate_switch_out[1:0] is not selected in the ALTGX_RECONFIG MegaWizard
Plug-In Manager.
Channel and TX PLL Select/Reconfig Modes
A .mif is required when you want to dynamically:
■ Enable or disable functional blocks of the transceiver channel (use Channel and
CMU PLL reconfiguration mode)
■ Reconfigure the functional mode of the transceiver channel from one to another
(use Channel and CMU PLL reconfiguration mode)
■ Reconfigure the core fabric Transceiver channel interface from one width to
another (use Channel and CMU PLL reconfiguration mode)
■ Reconfigure the data rate of the transceiver channel by selecting another
transmitter PLL (use Channel reconfiguration with TX PLL select mode)
■ Reconfigure the data rate of the transceiver channel by reconfiguring the CMU
PLL (use CMU PLL Reconfiguration mode)
HardCopy IV Device Handbook, Volume 3
© June 2009 Altera Corporation