FT801Q-R datasheet(27/44 Pages) BRIDGETEK

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FT801 Embedded Video Engine Datasheet

Version 1.3

Document Reference No.: BRT_000001

Clearance No.: BRT#003

Figure 4-9 Power State Transition

4.8.3.1 ACTIVE state

In ACTIVE state, the FT801 is in normal operation. The crystal oscillator and PLL are functioning. The

system clock applied to the FT801 core engines is enabled.

4.8.3.2 STANDBY state

In STANDBY state, the crystal oscillator and PLL remain functioning; the system clock applied to the

FT801 core engines is disabled. All register contents are retained.

4.8.3.3 SLEEP state

In SLEEP state, the crystal oscillator, PLL and system clock applied to the FT801 core engines are

disabled. All register contents are retained.

4.8.3.4 POWERDOWN state

In POWERDOWN state, the internal 1.2V regulator supplying the core digital logic, the crystal oscillator,

the PLL and the system clock applied to the FT801 core is disabled. All register contents are lost and

reset to default when the chip is next switched on.

4.8.3.5 Wake up to ACTIVE from other power states

Wake up from POWERDOWN state requires the host to pull the PD_N pin down and release, a low to high

transition enables the 1.2V regulator. POR generated when 1.2V is stable and FT801 will switch to

STANDBY mode after internal oscillator and PLL are up (maximum 20ms from PD_N rising edge). The

clock enable sequence mentioned in section 4.2.3 shall be executed to proper enable the system clock.

From SLEEP state, host MPU reads at memory address 0 to wake the FT801 into ACTIVE state. Host

needs to wait for at least 20ms before accessing any registers or commands. This is to guarantee the

crystal oscillator and PLL are up and stable.

From STANDBY state, host MPU reads at memory address 0 to wake the FT801 into ACTIVE state. Host

can immediately access any register or command.

POWERDOWN

STANDBY

SLEEP

VCC/VCCIO

Power ON

Toggle PD_N from high

to low

ACTIVE

Toggle PD_N from low

to high

Toggle PD_N from high

to low

Toggle PD_N from high to low or

Write command “POWERDOWN”

Write command “SLEEP”

Write command

“STANDBY”

Dummy Read “0”

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