AFS090 datasheet(55/334 Pages) MICROSEMI

55 / 334 page

Fusion Family of Mixed Signal FPGAs

R e visio n 2

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

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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