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TMS320C6455
Fixed-Point Digital Signal Processor
SPRS276H–MAY 2005–REVISED OCTOBER 2007
Table 3-1. C6455 Device Configuration Pins (AEA[19:0], ABA[1:0], and PCI_EN) (continued)
CONFIGURATION
PIN
IPD/
IPU
(1)
NO.
FUNCTIONAL DESCRIPTION
HPI peripheral bus width select (HPI_WIDTH).
0
HPI operates in HPI16 mode (default).
HPI bus is 16 bits wide; HD[15:0] pins are used and the remaining HD[31:16]
pins are reserved pins in the Hi-Z state.
1
HPI operates in HPI32 mode.
HPI bus is 32 bits wide; HD[31:0] pins are used.
Applies only when HPI function of HPI/PCI multiplexed pins is selected (PCI_EN pin = 0).
Device Endian mode (LENDIAN).
0
System operates in Big Endian mode.
1
System operates in Little Endian mode (default).
UTOPIA pin function enable bit (UTOPIA_EN).
This pin selects the function of the UTOPIA/EMAC and UTOPIA/MDIO multiplexed pins.
0
UTOPIA pin function disabled; EMAC and MDIO pin function enabled (default).
This means all multiplexed UTOPIA/EMAC and UTOPIA/MDIO pins function as
EMAC and MDIO pins. The interface used by EMAC/MDIO (MII, RMII, GMII or
the standalone RGMII) is controlled by the MACSEL[1:0] pins (AEA[10:9]).
1
UTOPIA pin function enabled; EMAC and MDIO pin function disabled.
This means all multiplexed UTOPIA/EMAC and UTOPIA/MDIO pins now function
as UTOPIA. The EMAC/MDIO peripheral can still be used with RGMII
(MACSEL[1:0] = 11).
For proper C6455 device operation, this pin must be externally pulled up with a 1-k
resistor
at device reset.
EMAC Interface Selects (MACSEL[1:0]).
These pins select the interface used by the EMAC/MDIO peripheral.
00
10/100 EMAC/MDIO with MII Interface [default]
01
10/100 EMAC/MDIO with RMII Interface
10
10/100/1000 EMAC/MDIO with GMII Interface
11
10/100/1000 EMAC/MDIO with RGMII Interface
If the UTOPIA pin function is selected [UTOPIA_EN (AEA12 pin) = 1] for multiplexed
UTOPIA/EMAC and UTOPIA/MDIO pins, the EMAC/MDIO peripheral can only be used with
RGMII.
For more detailed information on the UTOPIA_EN and MAC_SEL[1:0] control pin selections,
see
Table 3-3
.
PCI I2C EEPROM Auto-Initialization (PCI_EEAI).
PCI auto-initialization via external I2C EEPROM
0
PCI auto-initialization through external I2C EEPROM is disabled. The PCI
peripheral uses the specified PCI default values (default).
1
PCI auto-initialization through external I2C EEPROM is enabled. The PCI
peripheral is configured through external I2C EEPROM provided the PCI
peripheral pins are enabled (PCI_EN = 1).
Note:
If the PCI pin function is disabled (PCI_EN pin = 0), this pin must
not
be pulled up.
For proper C6455 device operation, do not oppose the IPD on this pin.
PCI Frequency Selection (PCI66).
Selects the operating frequency of the PCI (either 33 MHz or 66 MHz).
0
PCI operates at 33 MHz (default)
1
PCI operates at 66 MHz
Note:
If the PCI pin function is disabled (PCI_EN pin = 0), this pin must
not
be pulled up.
McBSP1 pin function enable bit (MCBSP1_EN).
Selects which function is enabled on the McBSP1/GPIO multiplexed pins.
0
GPIO pin function enabled (default).
This means all multiplexed McBSP1/GPIO pins function as GPIO pins.
1
McBSP1 pin function enabled.
This means all multiplexed McBSP1/GPIO pins function as McBSP1 pins.
AEA14
R25
IPD
AEA13
R27
IPU
AEA12
R28
IPD
AEA11
T25
IPD
[M25,
M27]
AEA[10:9]
IPD
AEA8
P25
IPD
AEA7
N27
IPD
AEA6
U27
IPD
AEA5
U28
IPD
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Device Configuration
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