HC4GX15 Datasheet, PDF (239/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 4: Matching Stratix IV Power and Configuration Requirements with HardCopy IV Devices
4–5
HardCopy IV Power-Up Options
Figure 4–3. Timing Waveform for the Instant-On Option When Pulsing the nCONFIG Signal (Note 1), (2), (3), (4), (5)
V_cc (ALL)
nCONFIG
nSTATUS
CONF_DONE
User I/O
"don't care"
High Z
INIT_DONE
"don't care"
t_CF2ST0
t_CF2ST1
t_ADD
t_CD
User Mode
t_UM
Notes to Figure 4–3:
(1) V_CC (ALL) represents either all the power pins or the last power pin powered up to specified operating conditions. All HardCopy IV power pins
must be powered within specifications as described in Hot Socketing sections.
(2) The nSTATUS and CONF_DONE pins must not be driven low externally for this waveform to apply.
(3) The nIO_pullup pin can affect the state of the user I/O pins during the initialization phase.
(4) INIT_DONE is an optional pin that can be enabled on the FPGA using the Quartus II software. HardCopy IV devices carry over the INIT_DONE
functionality from the prototyped FPGA design.
(5) The nCEO pin is asserted at approximately the same time as the CONF_DONE pin is released. However, the nCE pin must be driven low externally
for this waveform to apply.
f For more information about HardCopy IV configuration specifications, refer to the
Hot Socketing and Power-On Reset chapter in volume 1 of the HardCopy IV Device
Handbook.
Figure 4–4 shows the instant-on behavior of the configuration signals and user I/O
pins if the nCONFIG pin is pulsed while the V_CC supplies are already powered up and
stable.
Configuration Pin Compatibility
When designing a board for both a Stratix IV prototype device and its companion
HardCopy IV device, most configuration pins required by the Stratix IV device are not
required by the HardCopy IV device. The programmable capabilities of these
configuration pins in Stratix IV devices cannot carry over to the HardCopy IV
companion device because the HardCopy IV device is not programmable. To simplify
the board connection for these configuration pins, Altera recommends minimizing the
power-up and configuration pins that do not carry over from the Stratix IV device to
the HardCopy IV device.
Table 4–1 lists the dedicated and optional configuration pins for Stratix IV and
HardCopy IV devices. If the HardCopy IV device uses the pins’ optional function
found in Stratix IV devices, the Quartus II software allows you to set these pins as
dual-purpose pins. As dual-purpose pins, they have I/O functionality after power up
and initialization. These pins only switch to their I/O designation when the device
enters user mode (when INIT_DONE is asserted). The design may require that some
signals be present when the device transitions into user mode; therefore, it is
important to consider the state of these pins after power up and after the device is in
user mode when designing the board and selecting the state of dual-purpose pins.
© June 2009 Altera Corporation
HardCopy IV Device Handbook, Volume 2