Analog Devices ee-124 Application Notes

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a Engineer To Engineer Note

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EE-124

Technical Notes on using Analog Devices’ DSP components and development tools

Phone: (800) ANALOG-D, FAX: [phone], EMAIL: [e-mail], FTP: ftp.analog.com, WEB: www.analog.com/dsp

Booting on the ADSP-2192

The ADSP-2192 currently supports booting via either the PCI or USB interfaces. The tasks performed by the
ADSP-2192 boot loader kernel (which is located at address 0x14000 in Program ROM) will be two-fold:
To determine how the DSP is configured to boot (PCI or USB), and setting up and initializing appropriate
DSP registers, to facilitate the rest of booting.
Detecting the presence of a serial EEPROM on the NVRAM interface and reading data from the serial
EEPROM

The task of writing device drivers to facilitate booting of the DSP via these interfaces is with the user.

RESET Options on ADSP-2192

There are 3 types of RESET on the ADSP-2192. They are:

1 Power-on RESET
2 Forced RESET via PCI/USB
3 Software RESET

As currently proposed, for Power-on-RESET program flow will jump to the first location of the loader kernel at address
0x14000 and commence execution. A RESET via the PCI or USB device will cause program flow to jump to the command
monitor that is part of the loader kernel. The serial EEPROM detection/reading subroutines will be bypassed. In case of a
software RESET, the loader kernel will jump to the first location of internal PM memory at address 0x10000 and commence
execution.

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regarding the technical accuracy of the content provided in all Analog Devices’ Engineer-to-Engineer Notes.

ADSP-2192 Architecture and Memory Map

The ADSP-2192 is a 16-bit DSP with dual 219x cores. The DSP architecture and memory map is shown in
Figures 1 and 2, respectively. For a detailed discussion, please refer the ADSP-2192 datasheet.

PCI 2.2

33MHz

32 Bit

USB 1.1

Serial

Interface

AC-97
Codec

Interface

GPIO

Eight Pins

PCI/USB

DMA

Bus

16K X 24

PM

RAM

219X

CORE

#1

160 MHz

64K X 16

DM

RAM

Figure 1. ADSP-2192 architecture

Serial

Codec

4K X 16

SHARED

RAM

CORE

160 MHz

32K X 16

DM

RAM

219X

#2

Periphera

l

Control

16K x 24

PM

RAM

EE-124 Page 2

Technical Notes on using Analog Devices’ DSP components and development tools

Phone: (800) ANALOG-D, FAX: [phone], EMAIL: [e-mail], FTP: ftp.analog.com, WEB: www.analog.com/dsp

Figure 2. ADSP-2192 Memory Map

EE-124 Page 3

Technical Notes on using Analog Devices’ DSP components and development tools

Phone: (800) ANALOG-D, FAX: [phone], EMAIL: [e-mail], FTP: ftp.analog.com, WEB: www.analog.com/dsp

Booting Flowchart

Loader kernel reads CRST pins and determines Mode of

Booting; also performs housekeeping operations, setting up Interrupts, etc.

Loader Kernel reads BUS MODE pins to set up bus configuration

DSP emerges from ~RESET and
program flow jumps to Boot ROM

Call subroutine to auto-detect serial EEPROM

Serial EEPROM

Exists?

Yes

Determine 8 or 16-bit?
SPI or micro-wire?

Load serial EEPROM configuration and data

packets-load PCI/USB config registers accordingly

Do any serial EEPROM

need to be executed?

Yes

Execute Packets

No

Transfer Control to PCI

No

or USB to facilitate rest

of boot

After Booting is complete, user has
option to either return to serial EEPROM
or jump to user code and being execution

Finish

On emerging from RESET the loader kernel in DSP1’s ROM alone will attempt to read the serial EEPROM. The loader
kernel for DSP2 will not boot via the serial EEPROM. It will wait in a loop until DSP1 has completed reading data from the
serial EEPROM, at which point, both DSPs will booted directly via the PCI or USB interfaces.

EE-124 Page 4

Technical Notes on using Analog Devices’ DSP components and development tools

Phone: (800) ANALOG-D, FAX: [phone], EMAIL: [e-mail], FTP: ftp.analog.com, WEB: www.analog.com/dsp