TMS320DM642 datasheet(62/176 Pages) TI

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TMS320DM642

Video/Imaging Fixed-Point Digital Signal Processor

SPRS200L – JULY 2002 – REVISED JANUARY 2007

Table 3-7. Device Status (DEVSTAT) Register Selection Bit Descriptions

BIT

NAME

DESCRIPTION

31:12

Reserved

Reserved. Read-only, writes have no effect.

EMAC enable bit.

Shows the status of whether EMAC peripheral is enabled or disabled (default).

MAC_EN

0 = EMAC is disabled, and the module is powered down (default).

1 = EMAC is enabled.

This bit has no effect if the PCI peripheral is enabled (PCI_EN = 1).

HPI bus width control bit.

Shows the status of whether the HPI bus operates in 32-bit mode or in 16-bit mode (default).

HPI_WIDTH

0 = HPI operates in 16-bit mode. (default).

1 = HPI operates in 32-bit mode.

PCI EEPROM auto-initialization bit (PCI auto-initialization via external EEPROM).

Shows the status of whether the PCI module initializes internal registers via external EEPROM or if the

internal PCI default values are used instead (default).

PCI_EEAI

0 = PCI auto-initialization through EEPROM is disabled; the PCI peripheral uses the specified PCI default

values (default).

1 = PCI auto-initialization through EEPROM is enabled; the PCI peripheral is configured through

EEPROM provided the PCI peripheral pin is enabled (PCI_EN = 1).

PCI enable bit.

Shows the status of whether the PCI peripheral is enabled or disabled (default).

PCI_EN

0 = PCI disabled. (default).

1 = PCI enabled.

Global select for the PCI vs. HPI/EMAC/MDIO/GPIO peripherals.

Reserved

Reserved. Read-only, writes have no effect.

CLKMODE1

Clock mode select bits

Shows the status of whether the CPU clock frequency equals the input clock frequency X1 (Bypass), x6,

or x12.

Clock mode select for CPU clock frequency (CLKMODE[1:0])

00 - Bypass (x1) (default mode)

01 - x6

CLKMODE0

10 - x12

11 - Reserved

For more details on the CLKMODE pins and the PLL multiply factors, see the Clock PLL section of this

data sheet.

Device Endian mode (LEND)

Shows the status of whether the system is operating in Big Endian mode or Little Endian mode (default).

LENDIAN

0 - System is operating in Big Endian mode

1 - System is operating in Little Endian mode (default)

BOOTMODE1

Bootmode configuration bits

Shows the status of what device bootmode configuration is operational.

Bootmode [1:0]

00 - No boot (default mode)

BOOTMODE0

01 - HPI/PCI boot (based on PCI_EN pin)

10 - Reserved

11 - EMIFA boot

AECLKINSEL1

EMIFA input clock select

Shows the status of what clock mode is enabled or disabled for the EMIF.

Clock mode select for EMIFA (AECLKIN_SEL[1:0])

00 - AECLKIN (default mode)

AECLKINSEL0

01 - CPU/4 Clock Rate

10 - CPU/6 Clock Rate

11 - Reserved

Device Configurations

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