HC4GX15 Datasheet, PDF (237/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 4: Matching Stratix IV Power and Configuration Requirements with HardCopy IV Devices
4–3
HardCopy IV Power-Up Options
Figure 4–1. Timing Waveform for Instant On Option (Note 1), (2), (3), (4), (5)
Vcc (ALL)
nCONFIG
"don't care"
nSTATUS "don't care"
CONF_DONE ^{"don't care"}
User I/O ^{"don't care"}
INIT_DONE ^{"don't care"}
High-Z
t_POR
t_ADD
t_CD
User Mode
t_UM
Notes to Figure 4–1:
(1) V_CC (ALL) represents either all the power pins or the last power pin powered up to specified operating conditions.
(2) The nCONFIG, nSTATUS, and CONF_DONE pins are weakly pulled high by an external 10 K ohm resistor to V_CCPGM; they must be high for this
waveform to apply.
(3) User I/O pins may be tri-stated or driven before and during power-up. 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.
© June 2009 Altera Corporation
HardCopy IV Device Handbook, Volume 2