TMS320C6421 datasheet(76/227 Pages) TI

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TMS320C6421

Fixed-Point Digital Signal Processor

SPRS346B – JANUARY 2007 – REVISED APRIL 2007

Table 3-7. BOOTCFG Register Description (continued)

Bit

Field Name

Description

Fastboot PLL Multiplier Select [PLLMS] (see Section 3.5.1.2, Fast Boot PLL Multiplier Select [PLLMS])

14:12

PLLMS

If FASTBOOT = 1, this field selects the FASTBOOT PLL Multiplier according to Table 3-6.

The default value is latched from the PLLMS[2:0] configuration pins.

RSV

Reserved. Writes have no effect.

PINMUX0.AEM default [DAEM] (see Section 3.5.1.1, EMIFA Pinout Mode (AEM[2:0]))

For more details on the AEM settings, see Section 3.7.2.1, PINMUX0 Register Description.

10:8

DAEM

This field affects pin mux control by setting the default of PINMUX0.AEM. This field does not affect EMIFA

The default value is latched from the AEM[2:0] configuration pins.

7:4

RESERVED

Reserved. Writes have no effect.

Boot Mode (see Section 3.4.1, Boot Modes)

3:0

BOOTMODE

This field is used in conjunction with FASTBOOT and PLLMS to determine the device boot mode.

The default value is latched from the BOOTMODE[3:0] configuration pins.

3.4.2.2 BOOTCMPLT Register

If the bootloader code detects an error during boot, it records the error status in the Boot Complete

(BOOTCMPLT) register.

In addition, the BOOTCMPLT register is used for communication between the external host and the

bootloader code during a Host Boot (HPI Boot). Once the external host has completed boot, it must

perform the following communication with the bootloader code:

• Write the desired 32-bit CPU starting address in the DSPBOOTADDR register (see Section 3.4.2.3,

DSPBOOTADDR Register).

• Write a ‘1’ to the Boot Complete (BC) bit field in the BOOTCMPLT register to indicate that the host has

completed booting this device.

Once the bootloader code detects BC = 1, it directs the CPU to begin executing from the

DSPBOOTADDR register.

The BOOTCMPLT register is reset by any device-level global reset. For the list of device-level global

resets, see Section 6.5, Reset.

RESERVED

ERR

R/W-0000 0000 0000

R/W-0000

RESERVED

R/W- 0000 0000 0000 000

R/W-0

LEGEND: R = Read; W = Write; -n = value after reset

Figure 3-3. BOOTCMPLT Register

Table 3-8. BOOTCMPLT Register Description

Bit

Field Name

Description

31:20

RESERVED Reserved. For proper device operation, the user should only write "0" to these bits.

Device Configurations

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