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3.3
Peripheral Selection After Device Reset
SM320C6455-EP
FIXED-POINT DIGITAL SIGNAL PROCESSOR
SPRS462B – SEPTEMBER 2007 – REVISED JANUARY 2008
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
PERIPHERALS THAT CAN BE
STATE
DESCRIPTION
IN THIS STATE
HPI
PCI
Peripheral pin function has been completely
McBSP1
disabled through the device configuration
Static powerdown
UTOPIA
pins. Peripheral is held in reset and clock is
EMAC/MDIO
turned off.
EMIFA
DDR2 Memory Controller
TCP
VCP
I2C
Timer 0
Timer 1
Peripheral is held in reset and clock is turned
GPIO
Disabled
off. Default state for all peripherals not in
EMAC/MDIO
static powerdown mode.
McBSP0
McBSP1
HPI
PCI
UTOPIA
TCP
VCP
I2C
Timer 0
Timer 1
GPIO
MDIO
Clock to the peripheral is turned on and the
Enabled
EMAC/MDIO
peripheral is taken out of reset.
McBSP0
McBSP1
HPI
PCI
UTOPIA
EMIFA
DDR2 Memory Controller
Not a user-programmable state. This is an
All peripherals that can be in an
Enable in progress
intermediate state when transitioning from an
enabled state.
disabled state to 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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Device Configuration
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