TMS320DM641 datasheet(74/171 Pages) TI

74 / 171 page

Device Configurations

June 2003 − Revised August 2004

SPRS222C

2.4

Device Status Register Description

The device status register depicts the status of the device peripheral selection. For the actual register bit

names and their associated bit field descriptions, see Figure 2−5 and Table 2−6.

Reserved

R-0

Reserved

R-0

Reserved

MAC_EN

Reserved

R-0

R-x

R-0

R-x

R-0

Reserved

CLKMODE1

CLKMODE0

LENDIAN

BOOTMODE1

BOOTMODE0

AECLKINSEL1

AECLKINSEL0

R-x

Legend: R = Read only; R/W = Read/Write; -n = value after reset

Figure 2−5. Device Status Register (DEVSTAT) Description − 0x01B3 F004

Table 2−6. Device Status (DEVSTAT) Register Selection Bit Descriptions

BIT

NAME

DESCRIPTION

31:12

Reserved

Reserved. Read-only, writes have no effect.

MAC_EN

EMAC enable bit.

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

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

= EMAC is enabled.

10:7

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)

CLKMODE0

00 –

Bypass (x1) (default mode)

01 − x6

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.

LENDIAN

Device Endian mode (LEND)

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

–

System is operating in Big Endian mode

− 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

00 –

No boot (default mode)

01 − HPI [DM641 only]; Reserved [For DM640 device]

10 − Reserved

11 − EMIFA boot

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