ADSP-2192M
Optionally, extra boot information can come from an SPI or Microwire serial EPROM during PCI or USB booting. The boot process flow appears in Figure 5.
DSP EMERGES FROM RESET AND PROGRAM FLOW JUMPS TO BOOT ROM
LOADER KERNEL READS CRST PINS AND DETERMINES MODE OF BOOTING.
ALSO PERFORMS HOUSEKEEPING OPERATIONS, SETTING UP INTERRUPTS, ETC.
CALL SUBROUTINE TO AUTO-DETECT SERIAL EEPROM
LOADER KERNEL READS BUS MODE PINS TO SET UP BUS CONFIGURATION
SERIAL NO
EEPROM
EXISTS?
YES
DETERMINE 8- OR 16-BIT SPI OR MICROWIRE
LOAD SERIAL EEPROM CONFIGURATION AND DATA PACKETS.
LOAD PCI/USB CONFIGURATION REGISTERS ACCORDINGLY
DOES ANY SERIAL |
NO |
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EEPROM NEED TO |
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BE EXECUTED? |
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YES |
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EXECUTE PACKETS |
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Figure 5. Boot Process Flow
TRANSFER CONTROL TO PCI 
OR USB, TO FACILITATE 
REST OF BOOT
AFTER BOOTING IS COMPLETE, USER HAS OPTION TO RETURN TO SERIAL EEPROM OR JUMP TO USER CODE AND BEGIN EXECUTION
FINISH
Power Management Description
The ADSP-2192M supports several states with distinct power management and functionality capabilities. These states encompass both hardware and software states.
The driver and DSP code take responsibility for detailed power management of the modem, so minimum power levels are achieved regardless of OS or BIOS. In response to events, the driver and DSPs manage power by changing platform states as necessary.
Power Regulators
The ADSP-2192M is intended to operate in a variety of different systems. These include PCI, CardBus, USB, and embedded (Sub-ISA) applications. The PCI and USB specifications define power consumption limits that constrain the design of the DSP.
2.5 V Regulator Options
In 5 V and 3.3 V PCI applications the ADSP-2192M 2.5 V IVDD supply will be generated by an on-chip regulator. The internal 2.5 V supply (IVDD) can be generated by the on-chip regulator combined with an external power transistor as shown in Figure 6. To support the PCI specification’s power-down modes, the two transistors control the primary and auxiliary supply. If the reference voltage on RVDD (typically the same as PCIVDD) drops out, the VCTRLAUX will switch on the device connected to PCIVAUX and VCTRLVDD will switch off the primary supply. USB applications may require an external high efficiency switching regulator to generate the 2.5 V supply for the ADSP-2192M.
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