IGLOOe Device Family Overview
In addition, extensive on-chip programming circuitry allows for rapid, single-voltage (3.3 V)
programming of IGLOOe devices via an IEEE 1532 JTAG interface.
CCC
RAM Block
4,608-Bit Dual-Port SRAM
or FIFO Block
Pro I/Os
VersaTile
RAM Block
4,608-Bit Dual-Port SRAM
or FIFO Block
ISP AES
Decryption*
User Nonvolatile
FlashRom
Flash*Freeze
Technology
Charge
Pumps
Figure 1-1 • IGLOOe Device Architecture Overview
Flash*Freeze Technology
The IGLOOe device has an ultra-low power static mode, called Flash*Freeze mode, which retains all
SRAM and register information and can still quickly return to normal operation. Flash*Freeze
technology enables the user to quickly (within 1 µs) enter and exit Flash*Freeze mode by activating
the Flash*Freeze pin while all power supplies are kept at their original values. In addition, I/Os and
global I/Os can still be driven and can be toggling without impact on power consumption, clocks
can still be driven or can be toggling without impact on power consumption, and the device retains
all core registers, SRAM information, and states. I/O states are tristated during Flash*Freeze mode
or can be set to a certain state using weak pull-up or pull-down I/O attribute configuration. No
power is consumed by the I/O banks, clocks, JTAG pins, or PLL in this mode.
Flash*Freeze technology allows the user to switch to active mode on demand, thus simplifying the
power management of the device.
The Flash*Freeze pin (active low) can be routed internally to the core to allow the user's logic to
decide when it is safe to transition to this mode. It is also possible to use the Flash*Freeze pin as a
regular I/O if Flash*Freeze mode usage is not planned, which is advantageous because of the
1-4
v1.2
ACTEL [ Actel Corporation ]
