EP4CE30F29C7N Datasheet, PDF (410/488 Pages) Altera Corporation – Cyclone IV Device Handbook, Volume 1

3–12
Chapter 3: Cyclone IV Dynamic Reconfiguration
Dynamic Reconfiguration Modes
Figure 3–3 shows the timing diagram for a offset cancellation process.
Figure 3–3. Dynamic Reconfiguration Signals Transition during Offset Cancellation
reconfig_clk
(2)
busy
(1)
(3)
Notes to Figure 3–3:
(1) After device power up, the busy signal remains low for the first reconfig_clk cycle.
(2) The busy signal then gets asserted for the second reconfig_clk cycle, when the dynamic reconfiguration controller initiates the offset
cancellation process.
(3) The deassertion of the busy signal indicates the successful completion of the offset cancellation process.
Functional Simulation of the Offset Cancellation Process
You must connect the ALTGX_RECONFIG instances to the ALTGX instances in your
design for functional simulation. Functional simulation uses a reduced timing model
of the dynamic reconfiguration controller. Therefore, the duration of the offset
cancellation process is 16 reconfig_clk clock cycles for functional simulation only.
The gxb_powerdown signal must not be asserted during the offset cancellation
sequence (for functional simulation and silicon).
Dynamic Reconfiguration Modes
When you enable the dynamic reconfiguration feature, you can reconfigure the
following portions of each transceiver channel dynamically, without powering down
the other transceiver channels or the FPGA fabric of the device:
■ Analog (PMA) controls reconfiguration
■ Channel reconfiguration
■ PLL reconfiguration
Table 3–3 lists the supported dynamic reconfiguration modes for Cyclone IV GX
devices.
Table 3–3. Cyclone IV GX Supported Dynamic Reconfiguration Mode (Part 1 of 2)
Operational Mode
Quartus II Instances
Dynamic Reconfiguration
Supported Mode
Transmitter
Only
Receiver
Only
Transmitter
and
Receiver
Only
Offset Cancellation
—
v
v
Analog (PMA) Controls
Reconfiguration
v
v
v
ALTGX
v
v
.mif
ALTGX_ ALTPLL_ Requirements
RECONFIG RECONFIG
v
—
—
v
—
—
Cyclone IV Device Handbook,
Volume 2
November 2011 Altera Corporation