TMS320DM6435_16 Datasheet, PDF (77/252 Pages) Texas Instruments – Digital Media Processor

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TMS320DM6435
Digital Media Processor
SPRS344C – NOVEMBER 2006 – REVISED JUNE 2008
3.4.2.3 DSPBOOTADDR Register
The DSP Boot Address (DSPBOOTADDR) register contains the starting address for the C64x+ CPU.
Whenever the C64x+ is released from reset, it begins executing from the location pointed to by
DSPBOOTADDR register. For Host boots (HPI Boot), the DSPBOOTADDR register is also used for
communication between the Host and the bootloader code during boot.
The DSPBOOTADDR register is reset by any device-level global reset. For the list of device-level global
resets, see Section 6.5, Reset.
31
0
DSPBOOTADDR
R/W-0x0010 0000 or 0x4200 00000
LEGEND: R = Read; W = Write; -n = value after reset
Figure 3-5. DSPBOOTADDR Register— 0x01C4 0008
Table 3-11. DSPBOOTADDR Register Description
Bit
Field Name
Description
DSP Boot Address
After boot, the C64x+ CPU begins execution from this 32-bit address location. The lower 10 bits
(bits 9:0) should always be programmed to "0" as they are ignored by the C64x+. The default
value of the DSPBOOTADDR depends on the boot mode selected.
31:0
DSPBOOTADDR
The DSPBOOTADDR defaults to 0x0010 0000 when the Internal Bootloader ROM is used.
or
The DSPBOOTADDR defaults to 0x4200 0000 when EMIFA CS2 Space is used.
For the boot mode selections, see Table 3-5, Non-Fastboot Modes; Table 3-6, Fixed-Multiplier
Fastboot Modes; and Table 3-7, User-Select Multiplier Fastboot Modes.
For Non-Host Boot Modes, software can leave the DSPBOOTADDR register at default.
For Host Boots (HPI Boot), the DSPBOOTADDR register is also used for communication between the
Host and the bootloader code during boot. For Host Boots, the DSPBOOTADDR register defaults to
Internal Bootloader ROM, and the C64x+ CPU is immediately released from reset so that it can begin
executing the bootloader code in this internal ROM. The bootloader code waits for the Host to boot the
device. Once the Host is done booting the device, it must write a new starting address into the
DSPBOOTADDR register, and follow with writing BOOTCMPLT.BC = 1 to indicate the boot is complete.
As soon as the bootloader code detects BOOTCMPLT.BC = 1, it instructs the CPU to jump to this new
DSPBOOTADDR address. At this point, the CPU continues the rest of the code execution starting from
the new DSPBOOTADDR location and the boot is completed.
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Device Configuration
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