HC4GX15 Datasheet, PDF (232/668 Pages) Altera Corporation – HardCopy IV Device Handbook

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Chapter 3: Mapping Stratix IV Device Resources to HardCopy IV Devices
Power-Up and Configuration Pin Compatibility with Stratix IV Devices
For both the Stratix IV and HardCopy IV devices, the Quartus II software allows you
to set the I/O pins listed in Table 3–18 as dual-purpose pins (as shown in Figure 3–2).
As dual-purpose pins, they have I/O functionality when the device enters user mode
(when INIT_DONE is asserted).
Figure 3–2. Device and Pin Options Dialog Box
If these dual-purpose pins are required to configure the Stratix IV device, but will be
unused after configuration, these pins remain unused on the HardCopy IV device. It
is important to consider the state of these pins after power-up and when the device is
in user mode. For example, when replacing the Stratix IV device with a HardCopy IV
device, these pins may be left floating when the configuration device is removed if
you assign such pins as inputs. In this case, you will either require an external means
to drive them to a stable level, or set the pins to output driving ground.
HardCopy IV Device Handbook, Volume 2
© January 2010 Altera Corporation