TMS320C6421 datasheet(20/59 Pages) TI

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TMS320C6421

Fixed-Point Digital Signal Processor

SPRS346A – JANUARY 2007 – REVISED MARCH 2007

Table 2-8. Oscillator/PLL Terminal Functions

SIGNAL

TYPE(1)

OTHER(2)

DESCRIPTION

ZWT

ZDU

NAME

NO.

OSCILLATOR, PLL

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

MXI/

K19

N22

MXVDD

If the internal oscillator is bypassed, this is the external oscillator clock

CLKIN

input.(3)

MXO

J19

M22

MXVDD

Crystal output for MX oscillator

1.8 V power supply for MX oscillator. On the board, this pin can be

MXVDD

L18

N21

(4)

connected to the same 1.8 V power supply as DVDDR2.

MXVSS

K18

M21

GND

(4)

Ground for MX oscillator

PLLPWR18

L16

N20

(4)

1.8 V power supply for PLLs

(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 on external board connections, see , External Clock Input From MXI/CLKIN Pin.

(4)

For more information, see the Recommended Operating Conditions table.

Table 2-9. Clock Generator Terminal Functions

SIGNAL

TYPE(1)

OTHER(2)(3)

DESCRIPTION

ZWT

ZDU

NAME

NO.

CLOCK GENERATOR

This pin is multiplexed between the System Clock generator (PLL1), PWM2,

and GPIO.

CLKOUT0/

IPD

I/O/Z

For the System Clock generator (PLL1), it is clock output CLKOUT0. This is

PWM2/GP[84]

DVDD33

configurable for toggling at the device input clock frequency (MXI/CLKIN

frequency) or other divided-down (/1 to /32) clock outputs.

(1)

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

(2)

IPD = Internal pulldown, IPU = Internal pullup. For more detailed information on pullup/pulldown resistors and situations where external

pullup/pulldown resistors are required, see Section 3.2.1, Pullup/Pulldown Resistors.

(3)

Specifies the operating I/O supply voltage for each signal

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