Analog Devices VISUALDSP++ 3.5, Руководство пользователя

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Vi+ Loader Manual 4-3
for 16-Bit Processors
ADSP-2192-12 DSP Loader
Upon recovering from
RESET
, the ADSP-2192 DSP jumps to the first
location of the boot ROM at address
0x14000
, which is the start of the
boot kernel. The first task performed by the kernel is to determine the
type of
RESET
and the source of booting (PCI or USB). The kernel then
sets up and initializes appropriate DSP registers to facilitate the booting.
Three methods for resetting the ADSP-2192 DSP are: power-on reset,
forced reset via PCI/USB, and software reset. The reset type is specified by
bits 8 and 9 (
CRST<1:0>
) of the Chip Mode/Status Register (CMSR) as
follows in Table 4-1 .
If the reset source is a power-on reset, the processors’s
BUSMODE
pins are
read to determine whether boot is via PCI/USB/Sub-ISA or CardBUS
interface (
Table 4-2 ).
Table 4-1. ADSP-2192-12 DSP CMSR Settings
CMSR Setting RESET Type
CRST<1:0>=00
Power-on reset
CRST<1:0>=10
PCI/USB hard reset
CRST<1:0>=10
PCI/USB hard reset
CRST<1:0>=11
Soft reset from CMSR RST bit
Table 4-2. ADSP-2192-12 DSP Bus Modes
Bus Type BUS Mode
Pin 0
BUS Mode
Pin 1
SCFG:BUS(1:0)
Register Field
(Bits 1:10)
PCI or Mini-PCI GND GND
00
CardBUS PC-Card GND Open
01
Sub-ISA Open GND
10
USB Serial Bus Open Open
11