TMS320DM6435 datasheet(81/252 Pages) TI

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TMS320DM6435

Digital Media Processor

SPRS344B – NOVEMBER 2006 – REVISED NOVEMBER 2007

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.

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.

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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