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3.4 Boot Sequence

3.4.1

Boot Modes

TMS320DM6437

Digital Media Processor

SPRS345D – NOVEMBER 2006 – REVISED JUNE 2008

www.ti.com

The boot sequence is a process by which the device's memory is loaded with program and data sections,

and by which some of the device's internal registers are programmed with predetermined values. The boot

sequence is started automatically after each device-level global reset. For more details on device-level

global resets, see Section 6.5, Reset.

There are several methods by which the memory and register initialization can take place. Each of these

methods is referred to as a boot mode. The boot mode to be used is selected at reset. For more

information on the bootmode selections, see Section 3.4.1, Boot Modes.

The device is booted through multiple means—primary bootloaders within internal ROM or EMIFA, and

secondary user bootloaders from peripherals or external memories. Boot modes, pin configurations, and

The DM6437 boot modes are determined by these device boot and configuration pins. For information on

how these pins are sampled at device reset, see Section 6.5.1.2, Latching Boot and Configuration Pins.

• BOOTMODE[3:0]

• PCIEN

• FASTBOOT

• AEM[2:0]

• PLLMS[2:0]

Note: The PLLMS[2:0] configuration pins are actually multiplexed with the AEAW[2:0] configuration pins.

For more details on the multiplexed AEAW[2:0]/PLLMS[2:0] configuration pins and control, see

Section 3.5.1.2, EMIFA Address Width Selects (AEAW[2:0]) and FASTBOOT PLL Multiplier Selects

(PLLMS[2:0]).

BOOTMODE[3:0] and PCIEN determine the type of boot (e.g., I2C Boot, EMIFA Boot, HPI Boot, or PCI

Boot, etc.). FASTBOOT determines if the PLL is enabled during boot to speed up the boot process.

The combination of AEM[2:0] and PLLMS[2:0] is used by bootloader code to determine the PLL multiplier

used during fastboot modes (FASTBOOT = 1).

The DM6437 boot modes are grouped into three categories—Non-Fastboot Modes, Fixed-Multiplier

Fastboot Modes, and User-Select Multiplier Fastboot Modes.

• Non-Fastboot Modes (FASTBOOT = 0): The device operates in default PLL bypass mode during

boot. The Non-Fastboot bootmodes available on the DM6437 are shown in Table 3-5.

• Fixed-Multiplier Fastboot Modes (FASTBOOT = 1, AEM[2:0] = 001b): The bootloader code speeds

up the device during boot according to the fixed PLL multipliers. The Fixed-Multiplier Fastboot

bootmodes available on the DM6437 are shown in Table 3-6.

Note: The PLLMS[2:0] configurations have no effect on the Fixed-Multiplier Fastboot Modes, as these

pins function as AEAW[2:0] to select the EMIFA address width when AEM[2:0] = 001b.

• User-Select Multiplier Fastboot Modes (FASTBOOT = 1, AEM[2:0] = 000b,011b,100b,101b): The

bootloader code speeds up the device during boot. The PLL multiplier is selected by the user via the

PLLMS[2:0] pins. The User-Select Multiplier Fastboot bootmodes available on the DM6437 are shown

in Table 3-7.

All other modes not shown in these tables are reserved and invalid settings.

For more information on how these pins are sampled at device reset, see Section 6.5.1.2, Latching Boot

and Configuration Pins.

Device Configurations

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