Actel IGLOO PLUS Starter Kit, Руководство пользователя, Страница: 24 / 62

Power
24 IGLOO PLUS Starter Kit User’s Guide
Power Modes
In addition to the board, the IGLOO PLUS FPGA offers power advantages. Some key power advantages of the
IGLOO PLUS FPGAs are as follows:
• Flash*Freeze technology enables easy entry and exit from the static low power mode, where IGLOO consumes as little
as 5 μW while retaining the contents of the system memory and data registers.
• Sleep (and shutdown) mode allows the IGLOO PLUS FPGA core power supply (or all power supplies) to be powered
down when functionally is not required, while the rest of the system remains powered.
• The user low static ICC macro (ULSICC) reduces IGLOO PLUS FPGA dynamic and static power consumption.
The ULSICC macro, when enabled, disables the FlashROM, reducing the overall power of the device.
Table 3-2 gives a summary of the power modes available with IGLOO PLUS devices in general and is extracted from
the “Actel’s Flash*Freeze Technology and Low Power Modes” chapter of the IGLOO PLUS FPGA Fabric User’s Guide ..
Table 3-2 · Power Modes
Mode V
CC
V
CCI
Core Clocks
ULSICC
Macro
To Enter
Mode
To Resume
Operation
Trigger
Active On On On On N/A Initiate clock None –
Static
Idle On On On Off N/A Stop clock Initiate clock External
Flash*Freeze
Type 1
On On On On* N/A Assert FF pin Deassert FF pin External
Flash*Freeze
Type 2
On On On On*
Used to enter
Flash*Freeze
mode
Assert FF pin
and LSICC
Deassert FF pin External
Sleep On Off Off Off N/A Shut down V
CC
Turn on V
CC
supply
External
Shutdown Off Off Off Off N/A
Shut down V
CC
and V
CCI
supplies
Turn on V
CC
and
V
CCI
supplies
External
* External clocks can be left toggling while the device is in Flash*Freeze mode. Clocks generated by the embedded PLL will be turned off automatically.
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