Microsemi IGLOO2 - Clocks; Main Crystal Oscillator; Table 12 Surge Current on VDD During Digest Check Using System Services; Table 13 Clock Circuit

Board Design Guidelines for SmartFusion2 SoC and IGLOO2 FPGAs
AC393 Application Note Revision 14.0 19
The following table provides surge current data recorded for VDD when system services were being
used by the digest check service. To limit surge current during digest check, follow the
Microsemi-recommended board design guidelines.
2.5 Clocks
SmartFusion2 devices have two on-chip RC oscillators and up to two crystal oscillators for generating
clocks for the on-chip resources and logic in the FPGA fabric, as listed in the following table.
RC Oscillators:
• 1-MHz RC oscillator
• 50-MHz RC oscillator
Crystal Oscillators:
• Main crystal oscillator
• Auxiliary (RTC) crystal oscillator
All IGLOO2 devices and the M2S050 SmartFusion2 device only have a main crystal oscillator; they do
not have an auxiliary (RTC) crystal oscillator.
2.5.1 Main Crystal Oscillator
The main crystal oscillator works with an external crystal, ceramic resonator, or a resistor-capacitor
network to generate a high-precision clock in the range of 32 kHz to 20 MHz and is connected via the
pins XTLOSC_[MAIN/AUX]_EXTAL and XTLOSC_[MAIN/AUX]_XTAL.
Table 12 • Surge Current on VDD During Digest Check Using System Services (No Decoupling Capacitors
on Board)
Device
Width of Surge at
50% of Pulse (µS)
Surge Current on VDD
Units0 °C to 85 °C –40 °C to 100 °C –55 °C to 125 °C
M2S005/M2GL005 12 0.2 0.2 0.2 A
M2S010/M2GL010 12 0.5 0.5 0.5 A
M2S025/M2GL025 13 0.6 0.6 0.6 A
M2S050/M2GL050 13 0.9 0.9 0.9 A
M2S060/M2GL060 13 0.9 0.9 0.9 A
M2S090/M2GL090 20 1.0 1.0 1.0 A
M2S150/M2GL150 26 1.0 1.0 1.0 A
Table 13 • Clock Circuit
Resource
SmartFusion2 SoC Part
Number IGLOO2 Part Number
M2S005 M2S010 M2S025 M2S050 M2S150 M2GL005 M2GL010 M2GL025 M2GL050 M2GL150
On-Chip
Oscillators
RC
Oscillators
2222222222
Crystal
Oscillators
2221211111