TMS320DM643 datasheet(49/162 Pages) TI

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Device Configurations

3.1 Configurations at Reset

3.1.1

Peripheral Selection at Device Reset

3.1.2

Device Configuration at Device Reset

TMS320DM643

Video/Imaging Fixed-Point Digital Signal Processor

SPRS269C – FEBRUARY 2005 – REVISED JANUARY 2007

On the DM643 device, bootmode and certain device configurations/peripheral selections are determined at

device reset, while other device configurations/peripheral selections are software-configurable via the

peripheral configurations register (PERCFG) [address location 0x01B3F000] after device reset.

For proper DM643 device operation, the following external pins must be configured correctly:

• The GP0[0] (pin M5) must remain low, do not oppose the internal pulldown (IPD).

• The RSV09 (pin E2) at device reset must be pulled down via a 10-kΩ resistor.

Some DM643 peripherals share the same pins (internally muxed) and are mutually exclusive (i.e., HPI,

EMAC, and MDIO). Other DM643 peripherals (i.e., the Timers, I2C0, GP0, McBSP0, and VP2), are

always available.

• HPI, EMAC, and MDIO peripherals

The MAC_EN pin is latched at reset and determines specific peripheral selection, summarized in

Table 3-1. For further clarification of the HPI vs. EMAC configuration, see Table 3-2.

Table 3-1. HD5, and MAC_EN Peripheral Selection (HPI, EMAC, and MDIO)

PERIPHERAL SELECTION

PERIPHERALS SELECTED

HD5

MAC_EN

HPI Data

EMAC and MDIO

Pin [Y1]

Pin [C5]

Lower

Upper

√

Hi-Z

Disabled

√

Hi-Z

√

Disabled

√

• The HPI peripheral is enabled and based on the HD5 and MAC_EN pin configuration at reset, HPI16

mode or EMAC and MDIO can be selected.

• The MAC_EN pin, in combination with the HD5 pin, controls the selection of the EMAC and MDIO

peripherals (for more details, see Table 3-2).

Table 3-2. HPI vs. EMAC Peripheral Pin Selection

CONFIGURATION SELECTION

PERIPHERALS SELECTED

GP0[0] (Pin [M5])(1)

HD5 (Pin [Y1])

MAC_EN (Pin [C5])

HD[15:0]

HD[31:16]

HPI16

Hi-Z

HPI16

used for EMAC

HPI32 (HD[31:0])

Hi-Z

used for EMAC

(1) Invalid configuration. The GP0[0] pin must remain low during

device reset.

Table 3-3 describes the DM643 device configuration pins, which are set up via external pullup/pulldown

resistors through the specified EMIFA address bus pins (AEA[22:19]), and the TOUT1/LENDIAN, and the

HD5 pins (all of which are latched during device reset).

Note: If a configuration pin must be routed out from the device, the internal pullup/pulldown (IPU/IPD)

resistor should not be relied upon; TI recommends the use of an external pullup/pulldown resistor.

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Device Configurations

TMS320DM643 Datasheet(PDF) 49 Page - Texas Instruments

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