SM320C6455-EP

FIXED-POINT DIGITAL SIGNAL PROCESSOR

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SPRS462B – SEPTEMBER 2007 – REVISED JANUARY 2008

3.3Peripheral Selection After Device Reset

On the C6455 device, peripherals can be in one of several states. These states are listed in Table 3-4.

Table 3-4. Peripheral States

STATE

Static powerdown

Disabled

Enabled

Enable in progress

DESCRIPTION

Peripheral pin function has been completely disabled through the device configuration pins. Peripheral is held in reset and clock is turned off.

Peripheral is held in reset and clock is turned off. Default state for all peripherals not in static powerdown mode.

Clock to the peripheral is turned on and the peripheral is taken out of reset.

Not a user-programmable state. This is an intermediate state when transitioning from an disabled state to an enabled state.

PERIPHERALS THAT CAN BE

IN THIS STATE

HPI

PCI McBSP1

UTOPIA EMAC/MDIO EMIFA

DDR2 Memory Controller

TCP

VCP

I2C

Timer 0

Timer 1

GPIO

EMAC/MDIO

McBSP0

McBSP1

HPI

PCI

UTOPIA

TCP

VCP

I2C Timer 0 Timer 1

GPIO

MDIO EMAC/MDIO McBSP0 McBSP1

HPI

PCI UTOPIA EMIFA

DDR2 Memory Controller

All peripherals that can be in an enabled state.

Following device reset, all peripherals that are not in the static powerdown state are in the disabled state by default. Peripherals used for boot such as HPI and PCI are enabled automatically following a device reset.

Peripherals are allowed only certain transitions between states (see Figure 3-1).

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Texas Instruments SM320C6455-EP manual Peripheral Selection After Device Reset, Peripheral States