SM320C6414-EP_16 Datasheet, PDF (33/93 Pages) Texas Instruments – FIXED-POINT DIGITAL SIGNAL PROCESSORS

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SM320C6414-EP, SM320C6415-EP, SM320C6416-EP
FIXED-POINT DIGITAL SIGNAL PROCESSORS
SGUS043D – MAY 2003 – REVISED SEPTEMBER 2008
2.3 Multiplexed Pins
Multiplexed pins are pins that are shared by more than one peripheral and are internally multiplexed.
Some of these pins are configured by software, and the others are configured by external pullup/pulldown
resistors only at reset. The multiplexed pins that are configured by software can be programmed to switch
functionalities at any time. The multiplexed pins that are configured by external pullup/pulldown resistors
are mutually exclusive; only one peripheral has primary control of the function of these pins after reset.
Table 2-4 identifies the multiplexed pins on the C6414, C6415, and C6416 devices, shows the default
(primary) function and the default settings after reset, and describes the pins, registers, etc., necessary to
configure specific multiplexed functions.
2.4 Debugging Considerations
It is recommended that external connections be provided to device configuration pins, including
CLKMODE[1:0], BEA[20:13, 11, 9:7], HD5/AD5, PCI_EN, and MCBSP2_EN. Although internal
pullup/pulldown resistors exist on these pins (except for HD5/AD5), providing external connectivity adds
convenience to the user in debugging and flexibility in switching operating modes.
Internal pullup/pulldown resistors also exist on the nonconfiguration pins on the BEA bus (BEA[12, 10,
6:1]). Do not oppose the internal pullup/pulldown resistors on these nonconfiguration pins with external
pullup/pulldown resistors. If an external controller provides signals to these nonconfiguration pins, these
signals must be driven to the default state of the pins at reset or not be driven at all.
For the internal pullup/pulldown resistors on the C6414, C6415, and C6416 device pins, see the Terminal
Functions table.
Table 2-4. C6414, C6415, and C6416 Device Multiplexed Pins⁽¹⁾
MULTIPLEXED PINS
NAME
NO.
CLKOUT4/GP1 ⁽²⁾
CLKOUT6/GP2 ⁽²⁾
AE6
AD6
CLKS2/GP8 ⁽²⁾
AE4
GP9/PIDSEL
GP10/PCBE3
GP11/PREQ
GP12/PGNT
GP14/PCLK
GP13/PINTA
GP15/PRST
DX1/UXADDR4
FSX1/UXADDR3
FSR1/UXADDR2
DR1/UXADDR1
CLKX1/URADDR4
CLKS1/URADDR3
CLKR1/URADDR2
M3
L2
F1
J3
G4
F2
G3
AB11
AB13
AC9
AF11
AB12
AC8
AC10
DEFAULT FUNCTION
DEFAULT SETTING
DESCRIPTION
CLKOUT4
CLKOUT6
CLKS2
GP1EN = 0 (disabled)
GP2EN = 0 (disabled)
GP8EN = 0 (disabled)
These pins are software configurable. To use these pins as
GPIO pins, the GPxEN bits in the GPIO Enable Register
and the GPxDIR bits in the GPIO Direction Register must
be properly configured.
GPxEN = 1: GPx pin enabled
GPxDIR = 0: GPx pin is an input.
GPxDIR = 1: GPx pin is an output.
None
GPxEN = 0 (disabled)
PCI_EN = 0 (disabled)⁽¹⁾
To use GP[15:9] as GPIO pins, the PCI must be disabled
(PCI_EN = 0), the GPxEN bits in the GPIO Enable Register
and the GPxDIR bits in the GPIO Direction. Register must
be properly configured.
GPxEN = 1: GPx pin enabled
GPxDIR = 0: GPx pin is an input.
GPxDIR = 1: GPx pin is an output.
DX1
FSX1
FSR1
DR1
CLKX1
CLKS1
CLKR1
UTOPIA_EN (BEA11) = 0
(disabled) ⁽¹⁾
By default, McBSP1 is enabled upon reset (UTOPIA is
disabled).
To enable the UTOPIA peripheral, an external pullup
resistor (1 kΩ) must be provided on the BEA11 pin (setting
UTOPIA_EN = 1 at reset).
(1) For the C6415 and C6416 devices, all other stand-alone UTOPIA and PCI pins are tied off internally (pins in Hi-Z) when the peripheral is
disabled [UTOPIA_EN (BEA11) = 0 or PCI_EN = 0].
(2) The C6414 device does not support the PCI and UTOPIA peripherals. These are the only multiplexed pins on the C6414 device, all
other pins are stand-alone peripheral functions and are not multiplexed.
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Device Configurations
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