TMS320DM6446 datasheet(27/231 Pages) TI

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TMS320DM6446

Digital Media System-on-Chip

SPRS283E – DECEMBER 2005 – REVISED MARCH 2007

Table 2-6. Oscillator/PLL Terminal Functions

SIGNAL

TYPE(1)

OTHER(2)

DESCRIPTION

NAME

NO.

OSCILLATOR, PLL

Crystal input MXI for MX oscillator (system oscillator, typically 27 MHz). If a crystal

MXI/CLKIN

DVDD18

input is not used, but instead a physical clock-in source is supplied, this is the

external oscillator clock input.

Crystal output for MX oscillator. If a crystal input is not used, but instead a physical

MXO

DVDD18

clock-in source is supplied, MXO should be left as a No Connect.

1.8-V power supply for MX oscillator. If a crystal input is not used, but instead a

MXVDD

(3)

physical clock-in source is supplied, MXVDD should still be connected to the 1.8-V

power supply.

Ground for MX oscillator. If a crystal input is not used, but instead a physical

MXVSS

GND

(3)

clock-in source is supplied, MXVSS should still be connected to ground.

Crystal input for M24 oscillator (24 MHz for USB). If a crystal input is not used, but

M24XI

F18

DVDD18

instead a physical clock-in source is supplied, this is the external oscillator clock

input. When the USB peripheral is not used, M24XI should be left as a No Connect.

Crystal output for M24 oscillator. If a crystal input is not used, but instead a physical

M24XO

F19

DVDD18

clock-in source is supplied, M24XO should be left as a No Connect. When the USB

peripheral is not used, M24XO should be left as a No Connect.

1.8-V power supply for M24 oscillator. If a crystal input is not used, but instead a

physical clock-in source is supplied, M24VDD should still be connected to the 1.8-V

M24VDD

F16

(3)

power supply. When the USB peripheral is not used, M24VDD should be connected

to the 1.8-V power supply.

Ground for M24 oscillator. If a crystal input is not used, but instead a physical

M24VSS

F17

GND

(3)

clock-in source is supplied, M24VSS should still be connected to ground. When the

USB peripheral is not used, M24VSS should be connected to ground.

PLLVDD18

(3)

1.8-V power supply for PLLs (system).

(1)

I = Input, O = Output, Z = High impedance, S = Supply voltage, GND = Ground, A = Analog signal

(2)

Specifies the operating I/O supply voltage for each signal

(3)

For more information, see the Recommended Operating Conditions table

Table 2-7. Clock Generator Terminal Functions

SIGNAL

TYPE(1)

OTHER(2)

DESCRIPTION

NAME

NO.

CLOCK GENERATOR

This pin is multiplexed between the PLL1 clock generator and GPIO.

CLK_OUT0/

I/O/Z

DVDD18

For the PLL1 clock generator, it is clock output CLK_OUT0. This is configurable for

GPIO48

13.5 MHz or 27 MHz clock outputs.

CLK_OUT1/

This pin is multiplexed between the USB clock generator, timer, and GPIO.

TIM_IN/

E19

I/O/Z

DVDD18

For the USB clock generator, it is clock output CLK_OUT1. This is configurable for

GPIO49

12 MHz or 24 MHz clock outputs.

(1)

I = Input, O = Output, Z = High impedance, S = Supply voltage, GND = Ground, A = Analog signal

(2)

Specifies the operating I/O supply voltage for each signal

Table 2-8. RESET and JTAG Terminal Functions

SIGNAL

TYPE(1)

OTHER(2)(3)

DESCRIPTION

NAME

NO.

RESET

IPU

RESET

This is the active low global reset input.

DVDD18

JTAG

(1)

I = Input, O = Output, Z = High impedance, S = Supply voltage, GND = Ground, A = Analog signal

(2)

IPD = Internal pulldown, IPU = Internal pullup. (To pull up a signal to the opposite supply rail, a 1-k

Ω resistor should be used.)

(3)

Specifies the operating I/O supply voltage for each signal

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