FX3 datasheet(12/45 Pages) CYPRESS

12 / 45 page

CYUSB301X

Document Number: 001-52136 Rev. *N

Page 12 of 45

Standby Mode (L3)

■ The power consumption in this mode does

not exceed ISB3

■ All configuration register settings and

program/data RAM contents are

preserved. However, data in the buffers or

other parts of the data path, if any, is not

guaranteed. Therefore, the external

processor should take care that the data

needed is read before putting FX3 into this

Standby Mode

■ The program counter is reset after waking

up from Standby

■ GPIO pins maintain their configuration

■ Crystal oscillator is turned off

■ Internal PLL is turned off

■ USB transceiver is turned off

■ ARM926EJ-S core is powered down.

Upon wakeup, the core re-starts and runs

the program stored in the program/data

RAM

■ Power supply for the wakeup source and

core power must be retained. All other

power domains can be turned on/off

individually

■ Firmware executing on

ARM926EJ-S core or external

processor configures the appropriate

■ Detection of VBUS

■ Level detect on

UART_CTS

(Programmable

Polarity)

■ GPIF II interface

assertion of CTL[0]

■ Assertion of RESET#

Core Power Down

Mode (L4)

■ The power consumption in this mode does

not exceed ISB4

■ Core power is turned off

■ All buffer memory, configuration registers,

and the program RAM do not maintain

state. After exiting this mode, reload the

firmware

■ In this mode, all other power domains can

be turned on/off individually

■ Turn off VDD

■ Reapply VDD

■ Assertion of RESET#

Table 6. Entry and Exit Methods for Low-Power Modes (continued)

Low-Power Mode

Characteristics

Methods of Entry

Methods of Exit

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