EP4CE30F29C7N Datasheet, PDF (432/488 Pages) Altera Corporation – Cyclone IV Device Handbook, Volume 1

3–34
Chapter 3: Cyclone IV Dynamic Reconfiguration
Dynamic Reconfiguration Modes
The .mif files carries the reconfiguration information that will be used to reconfigure
the multipurpose PLL or general purpose PLL dynamically. The .mif contents is
generated automatically when you select the Enable PLL Reconfiguration option in
the Reconfiguration Setting in ALTGX instances. The .mif files will be generated
based on the data rate and input reference clock setting in the ALTGX MegaWizard.
You must use the external ROM and feed its content to the ALTPLL_RECONFIG
megafunction to reconfigure the multipurpose PLL setting.
f For more information about instantiating the ALTPLL_Reconfig, refer to the AN 609:
Implementing Dynamic Reconfiguration in Cyclone IV GX Devices.
Figure 3–16 shows the connection for PLL reconfiguration mode.
Figure 3–16. ALTGX and ALTPLL_RECONFIG Connection for PLL Reconfiguration Mode
ALTPLL_RECONFIG (3)
pll_reconfig_signals
ALTGX
GXBL0
MPLL2
Transceiver Channels
rom_data_in
To external ^{rom_address_out[7..0]}
ROM
write_rom_ena
PLL_scandata[n..0] (1)
PLL_scanclk[n..0] (1)
PLL_scanclkena[n..0] (1)
PLL_configupdate[n..0] (1)
PLL_areset[n..0] (1)
Transceiver Channels
Transceiver Channels
Transceiver Channels
MPLL1
PLL_reconfig_done[n..0] (1),(2), pll_scandataout[n..0] (1)
Notes to Figure 3–16:
(1) <n> = (number of transceiver PLLs configured in the ALTGX MegaWizard) - 1.
(2) You must connect the pll_reconfig_done signal from the ALTGX to the pll_scandone port from ALTPLL_RECONFIG.
(3) You need two ALTPLL_RECONFIG controllers if you have two separate ALTGX instances with transceiver PLL instantiated in each ALTGX instance.
f For more information about connecting the ALTPLL_RECONFIG and ALTGX
instances, refer to the AN 609: Implementing Dynamic Reconfiguration in Cyclone IV GX
Devices.
Cyclone IV Device Handbook,
Volume 2
November 2011 Altera Corporation