TMS320DM335 datasheet(82/156 Pages) TI

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3.11 Default Device Configurations

3.11.1 Device Configuration Pins

TMS320DM335

Digital Media System-on-Chip (DMSoC)

SPRS528 – JULY 2008

www.ti.com

Table 3-18. Reset Types (continued)

Type

Initiator

Effect

System Reset

ARM emulator

Resets all modules except memory and ARM

emulation. It is a soft reset that maintains memory

contents and does not affect or reset clocks or power

states.

Module Reset

ARM software

Resets a specific module. Allows the ARM to

independently reset any module. Module reset is

intended as a debug tool not as a tool to use in

production.

After POR, warm reset, and max reset, the chip is in its default configuration. This section highlights the

default configurations associated with PLLs, clocks, ARM boot mode, and AEMIF.

NOTE

Default configuration is the configuration immediately after POR, warm reset, and max

reset and just before the boot process begins. The boot ROM updates the configuration.

See Section 3.12 for more information on the boot process.

The device configuration pins are described in Table 3-19. The device configuration pins are latched at

reset and allow you to configure all of the following options at reset:

• ARM Boot Mode

• Asynchronous EMIF pin configuration

These pins are described further in the following sections.

NOTE

The device configuration pins are multiplexed with AEMIF pins. After the device

configuration pins are sampled at reset, they automatically change to function as AEMIF

pins. Pin multiplexing is described in Section 3.8.

Table 3-19. Device Configuration

Default Setting (by

internal

Device

Sampled

pull-up/

Configuration Input

Function

pull-down)

Device Configuration Affected

BTSEL[1:0]

Selects ARM boot mode

EM_A[13:12]

If any ROM boot mode is selected, GIO61

00 = Boot from ROM (NAND)

(NAND)

is used to indicated boot status.

01 = Boot from AEMIF

If NAND boot is selected, CE0 is used for

10 = Boot from ROM

NAND. Use AECFG[3:0] to configure

(MMC/SD)

AEMIF pins for NAND.

11 = Boot from ROM (UART)

If AEMIF boot is selected, CE0 is used for

AEMIF device (OneNAND, ROM). Use

AECFG[3:0] to configure AEMIF pins for

NAND.

If MMC/SD boot is selected, MMC/SD0 is

used.

AECFG[3:0]

Selects AEMIF pin

EM_A[11:8]

1101

Selects the AEMIF pin configuration. Refer

configuration

(NAND)

to pin-muxing information in Section 3.9.1.

Note that AECFG[3:0] affects both AEMIF

(BTSEL[1:0]=01) and NAND

(BTSEL[1:0]=00) boot modes.

Detailed Device Description

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