HC4GX15 Datasheet, PDF (241/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 4: Matching Stratix IV Power and Configuration Requirements with HardCopy IV Devices
4–7
Examples of Mapping a Stratix FPGA Configuration to a HardCopy ASIC
Most optional configuration pins listed in Table 4–1 on page 4–6 support the various
configuration schemes available in Stratix IV FPGAs. Parallel programming and
remote update configuration modes use most of the pins in Table 4–1 on page 4–6.
HardCopy IV devices are not configurable and do not support configuration
emulation mode. Therefore, Altera recommends that you minimize using the optional
functionality of the configuration pin in the Stratix IV design by using another mode
such as passive serial configuration mode.
If some of these dual-purpose pins are needed to configure the Stratix IV FPGA, but
will be unused after configuration, these pins remain unused on the HardCopy IV
device. Therefore, use caution when designing for these pins on the Stratix IV and
HardCopy IV boards. The removal of the Stratix IV device and its corresponding
configuration device may leave these pins floating on the HardCopy IV device if you
assign them as inputs without any external means of driving them to a stable level.
When selecting a Stratix IV device and its device options, consider the
after-configuration requirements of these pins and set them appropriately in the
Quartus II software.
Examples of Mapping a Stratix FPGA Configuration to a HardCopy ASIC
This section provides examples of how HardCopy IV devices replace Stratix IV
FPGAs using different configuration schemes.
HardCopy IV Device Replacing a Stand-Alone Stratix IV Device
Figure 4–4 shows the Stratix IV device before it is replaced with the HardCopy IV
device. The example in Figure 4–5 shows the single HardCopy IV device replacing a
stand-alone Stratix IV device. The configuration device, now redundant, is removed,
and no further board changes are necessary. You can remove he pull-up resistors on
the nCONFIG, nSTATUS, and CONF_DONE pins.
Figure 4–4. Configuration of a Stand-Alone Stratix IV Device
V_CCPGM V_CCPGM V_CCPGM
Stratix IV Device
DCLK
DATA0
nSTATUS
CONF_DONE
nCONFIG
n
MSEL
nCEO
nCE
10 kΩ 10 kΩ
N.C.
Configuration
10 kΩ _Device
DCLK
DATA
OE
nCASC N.C.
nCS
nINIT_CONF
GND
© June 2009 Altera Corporation
HardCopy IV Device Handbook, Volume 2