HC4GX15 Datasheet, PDF (142/668 Pages) Altera Corporation – HardCopy IV Device Handbook

9–4
Figure 9–3. Simplified POR Block Diagram
Chapter 9: Hot Socketing and Power-On Reset in HardCopy IV Devices
Power-On Reset Circuitry
Regulator POR
Monitored V _CC Supplies (1) _{Satellite POR}
PORSEL
POR PULSE
SETTING
(4 ms to 12 ms or
100 ms to 300 ms)
POR
Main POR
Note to Figure 9–3:
(1) For more details about these supplies, refer to Table 9–1.
The POR circuit monitors the power supplies specified in Table 9–1.
Table 9–1. Power Supplies Monitored by the POR Circuitry
Power Supply
Description
V_CC
Core voltage and periphery circuitry power supply
V_CCAUX (1)
Power supply for temperature sensing diode and POR circuitry
V_{C CP D}
I/O pre-driver power supply
V_{C CP G M}
Configuration pins power supply
Note to Table 9–1:
(1) This power supply is for the auxiliary power supply in Stratix IV devices.
Setting (V)
0.9
2.5
2.5, 3.0
1.8, 2.5, 3.0
The POR circuit does not monitor the power supplies listed in Table 9–2.
Table 9–2. Power Supplies Not Monitored by the POR Circuitry
Voltage Supply
Description
Setting (V)
V_{C CIO}
V_{C CA _ PL L}
V_{C CD _ P LL}
V_{C C_ C LK IN}
I/O power supply
PLL analog global power supply
PLL digital power supply
PLL differential clock input power supply (top and bottom
I/O banks only)
1.2, 1.5, 1.8, 2.5, 3.0
2.5
0.9
2.5
V_{C CB AT}
Battery back-up power supply for design security volatile
N/A
key storage
The POR specification is designed to ensure that all circuits in the HardCopy IV
device are at certain known states during power up.
HardCopy IV Device Handbook, Volume 1
© December 2008 Altera Corporation