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P1AFS1500-PQ256 Datasheet(PDF) 55 Page - Microsemi Corporation

Part No. P1AFS1500-PQ256
Description  Fusion Family of Mixed Signal FPGAs
Download  334 Pages
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Manufacturer  MICROSEMI [Microsemi Corporation]
Direct Link  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

P1AFS1500-PQ256 Datasheet(HTML) 55 Page - Microsemi Corporation

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Fusion Family of Mixed Signal FPGAs
Revision 4
2-39
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 "Real-Time Counter (part of AB macro)"
section on page 2-35. A match value corresponding to the wake-up time is loaded into the Match
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.
Note: * 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.
Figure 2-31 • State Diagram for All Different Power Modes
Normal Operation
3.3 V on,
VREN Enable
Standby Mode
3.3 V On,
RTC Enabled
VREN Disabled
OFF State
3.3 V Off,
PUB Pull-Up,
TRST Pull-Down,
VREN Disabled
VRPU = 0
And PUB = 1
And TRST = 0
PUB = 0
or TRST = 1
VRPU = 0
And PUB = 1
And TRST = 0
And *RTC: CTRL_STAT:
xtal_en = 1
*RTCPSMMATCH = 1
Or PUB = 0
Or TRST = 1
Sleep Mode
3.3 V On,
VREN Disabled
3.3 V ON, 1.5 V ON (VR on)
3.3 V OFF
3.3 V ON
3.3 V Power Supply ON/OFF
VINITSTATE = 0
And PUB = 1
And TRST = 0
VRINITSTATE = 1
or PUB = 0
or TRST = 1


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