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3.7.10 Stereo wideband CODEC
The MSM6280 device integrates a wideband voice/audio codec into the MSM. The codec supports two
differential microphone inputs, one differential earphone output, one single-ended earphone output,
and a differential analog auxiliary interface. The codec integrates the microphone and earphone
amplifiers into the MSM6280 device, reducing the external component count to just a few passive
components. The microphone (Tx) audio path consists of a two-stage amplifier with the gain of the
second stage set externally. The Rx/Tx paths are designed to meet the ITU-G.712 requirements for
digital transmission systems.
3.7.11 Vocoder Subsystem
The MSM6280 QDSP4000 supports AMR, FR, EFR, and HR. In addition, the QDSP4000 has modules
to support the following audio functions: DTMF tone generation, DTMF tone detection, Tx/Rx volume
controls, Tx/Rx automatic gain control (AGC), Rx automatic volume control (AVC), ear seal echo
canceller (ESEC), acoustic echo canceller (AEC), noise suppression (NS), and programmable, 13-tap,
Type-I, FIR, Tx/Rx compensation filters. The MSM6280 device’s integrated ARM926EJ-S processor
downloads the firmware into the QDSP4000 and configures the QDSP4000 to support the desired
functionality.
3.7.12 ARM Microprocessor subsystem
The MSM6280 device uses an embedded ARM926EJ-S microprocessor. This microprocessor,
through the system software, controls most of the functionality for the MSM device, including control of
the external peripherals such as the keypad, LCD, RAM, ROM, and EEPROM devices. Through a
generic serial bus interface (SBI), the ARM926EJ-S configures and controls the functionality of the
RFR6220, RTR6250, RFR6250, and PM6650-2/PM6650-3 devices.
For the RFCMOS platform, SSBI (single-wire SBI) will be supported.
3.7.13 Mode Select and JTAG Interfaces
The mode pins to the MSM6280 device determine the overall operating mode of the ASIC. The options
under the control of the mode inputs are native mode, which is the normal subscriber unit operation,
ETM mode, which enables the built-in trace mode, and test mode for factory testing.
The MSM6280 device meets the intent of the ANSI/IEEE 1149.1A-1993 feature list. The JTAG
interface can be used to test digital interconnects between devices within the handset during
manufacture.
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