Specifications

AMBE-3000™ Vocoder Chip Users Manual
Version 2.8, August, 2011
Electrical Characteristics and
Requirements
Figure 12 Power Mode States Basic Timing
3.8.1 Run State
This is the highest power state. The AMBE-3000™ Vocoder Chip is in this state whenever it is actively executing code. The
AMBE-3000™ Vocoder Chip is in the run state if the encoder is running or if the decoder is running or other processing is
being performed.
3.8.2 Idle State
This state uses less power than the run state. The AMBE-3000™ 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.
3.8.3 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-3000™ Vocoder Chip will only enter this state if low power mode is enabled, AND
the AMBE-3000™
Vocoder Chip is not actively executing code, AND
no peripherals are in use. Peripheral activity causes the AMBE-3000™
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.
3.8.4 Halt State
This is the lowest power state. The AMBE-3000™ 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)
3.8.5 Power Modes
The AMBE-3000™ Vocoder Chip has two power modes:
(1) Normal Power Mode: In this mode the AMBE-3000™ Vocoder Chip switches between the Run State and the Idle
State.
(2) Low Power Mode: In this mode the AMBE-3000™ Vocoder Chip switches between the Run State, the Idle State, and
the Standby State. Lower power is consumed because the AMBE-3000™ Vocoder Chip is in the Standby state a
large percentage of the time. low power mode is enabled or disabled by sending a packet containing
PKT_LOWPOWER field to the AMBE-3000™ Vocoder Chip. After reset, low power mode is always disabled.
(Subject to Change) Page 24
DVSI CONFIDENTIAL PROPRIETARY