參數(shù)資料
型號： ADSP-2192M
廠商： Analog Devices, Inc.
元件分類： 數(shù)字信號處理
英文描述： DSP Microcomputer
中文描述： DSP微機
文件頁數(shù)： 24/40頁
文件大?。?/td> 1307K
代理商： ADSP-2192M
ADSP-2192M
–24–
REV. 0
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
.
Power Management Description
The ADSP-2192M supports several states with distinct power
management and functionality capabilities. These states encom-
pass 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.
Figure 5. Boot Process Flow
DSPEMERGESFROMRESETANDPROGRAMFLOWJUMPSTOBOOTROM
LOADERKERNELREADSCRSTPINSANDDETERMINESMODEOF BOOTING.
ALSOPERFORMSHOUSEKEEPINGOPERATIONS, SETTINGUPINTERRUPTS, ETC.
CALLSUBROUTINETOAUTO-DETECTSERIAL EEPROM
LOADERKERNELREADSBUSMODEPINSTOSETUPBUSCONFIGURATION
SERIAL
EEPROM
EXISTS
LOADSERIALEEPROMCONFIGURATIONANDDATAPACKETS.
LOADPCI/USBCONFIGURATIONREGISTERSACCORDINGLY
DOESANYSERIAL
EEPROMNEEDTO
BEEXECUTED
EXECUTEPACKETS
TRANSFERCONTROLTOPCI
ORUSB, TOFACILITATE
RESTOFBOOT
AFTERBOOTINGISCOMPLETE,
USERHASOPTIONTORETURN
TOSERIALEEPROMORJUMPTO
USERCODEANDBEGINEXECUTION
DETERMINE8- OR16-BITSPI ORMICROWIRE
NO
YES
NO
YES
FINISH
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