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AMBE-3000F™ Vocoder Chip Users Manual

Version 3.4, April, 2014

Electrical Characteristics and

Requirements

order to reduce power consumption the AMBE-3000F™ Vocoder Chip automatically switches to lower power states when

possible. The AMBE-3000F™ Vocoder Chip may switch power states many times during each 20 ms frame. For instance,

during periods when the AMBE-3000F™ Vocoder Chip is not actively executing code, the AMBE-3000F™ Vocoder Chip

will be in a low power state. When a codec interrupt occurs the AMBE-3000F™ Vocoder Chip will briefly switch into the run

state and then switch back to the lower power state. If the codec interface is in use, then the AMBE-3000F™ Vocoder Chip

will never remain in the low power state for more than 125 us at a time.

Figure 15 Power Mode States Basic Timing

3.9.1 Run State

This is the highest power state. The AMBE-3000F™ Vocoder Chip is in this state whenever it is actively executing code. The

AMBE-3000F™ Vocoder Chip is in the run state if the encoder is running or if the decoder is running or other processing is

being performed.

3.9.2 Idle State

This state uses less power than the run state. The AMBE-3000F™ Vocoder Chip is in this state whenever it is not actively

executing code, but peripherals are active. Peripherals are active when packets are being transmitted or received or when codec

samples are being clocked in/out.

3.9.3 Standby State

This state uses even less power than the Idle State. However, no peripherals can be sending or receiving data while in this

state. The AMBE-3000F™ Vocoder Chip will only enter this state if low power mode is enabled, AND

the AMBE-3000F™

Vocoder Chip is not actively executing code, AND

no peripherals are in use. Peripheral activity causes the AMBE-3000F™

Vocoder Chip to re-enter the run state. When low power mode is enabled, some extra hardware connections are required. The

required connections are dependent upon which interfaces are in use.

3.9.4 Halt State

This is the lowest power state. The AMBE-3000F™ Vocoder Chip does not automatically enter in and out of this state. The

only way to get into this state is to send a packet containing a PKT_HALT field. The only way to get out of this state is via a

hard reset. During a hard reset be sure to hold UART_TX HIGH (LQFP pin 111, BGA pin C7)

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Digital Voice Systems AMBE-3000 Spezifikationen Seite 36