M1AFS250-FGG256I Actel Corporation, M1AFS250-FGG256I Datasheet - Page 55

• Manufacturer Part Number: M1AFS250-FGG256I
• Description: Actel Fusion Family Of Mixed Signal Fpgas
• Manufacturer: Actel Corporation

Note:
Figure 2-31 • State Diagram for All Different Power Modes
* To enter and exit standby mode without any external stimulus on PUB or TRST, the vr_en_mat in the
CTRL_STAT register must also be set to 1, so that RTCPSMMATCH will assert when a match occurs; hence the
device exits standby mode.
OFF State
3.3 V Off,
PUB Pull-Up,
TRST Pull-Down,
VREN Disabled
When TRST is 1 or PUB is 0, the 1.5 V voltage regulator is always ON, putting the Fusion device in
normal operation at all times. Therefore, when the JTAG port is not in reset, the Fusion device cannot
enter sleep mode or standby mode.
To enter standby mode, the Fusion device must first power-up into normal operation. The RTC is
enabled through the RTC Control/Status Register described in the
macro)" section on page
Register. The 1.5 V voltage regulator is disabled by setting VRPU to 0 to allow the Fusion device to enter
standby mode, when the 1.5 V supply is off but the RTC remains on.
3.3 V OFF
VINITSTATE = 0
And PUB = 1
And TRST = 0
VRINITSTATE = 1
or PUB = 0
or TRST = 1
3.3 V Power Supply ON/OFF
2-35. A match value corresponding to the wake-up time is loaded into the Match
VRPU = 0
And PUB = 1
And TRST = 0
VREN Disabled
Sleep Mode
3.3 V On,
3.3 V ON, 1.5 V ON (VR on)
Normal Operation
VREN Enable
R e v i s i o n 1
3.3 V ON
3.3 V on,
PUB = 0
or TRST = 1
*RTCPSMMATCH = 1
Or TRST = 1
Actel Fusion Family of Mixed Signal FPGAs
Or PUB = 0
"Real-Time Counter (part of AB
VRPU = 0
And PUB = 1
And TRST = 0
And *RTC: CTRL_STAT:
xtal_en = 1
VREN Disabled
Standby Mode
RTC Enabled
3.3 V On,
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