TMS320VC5509APGE datasheet(52/150 Pages) TI2

52 / 150 page

Functional Overview

November 2002 − Revised January 2008

SPRS205K

Reserved

DPLLSTAT

APLLSTAT

PLLSEL

R, 0000 0000 0000 0

R, 1

R, 0

R/W, 0

LEGEND: R = Read, W = Write, n = value after reset

Figure 3−18. USB PLL Selection and Status Register Bit Layout

Table 3−18. USB PLL Selection and Status Register Bit Functions

BIT

NO.

BIT

NAME

RESET

VALUE

FUNCTION

15−3

Reserved

Reserved bits. Always write 0.

DPLLSTAT

Status bit indicating if the DPLL is the source for the USB module clock.

DPLLSTAT = 0

The DPLL is not the USB module clock source.

DPLLSTAT = 1

The DPLL is the USB module clock source.

APLLSTAT

Status bit indicating if the APLL is the source for the USB module clock.

APLLSTAT = 0

The APLL is not the USB module clock source.

APLLSTAT = 1

The APLL is the USB module clock source.

PLLSEL

USB module clock source selection bit.

PLLSEL = 0

DPLL is selected as USB module clock source.

PLLSEL = 1

APLL is selected as USB module clock source.

MULT

DIV

COUNT

MODE

STAT

R/W, 0000

R/W, 0

R, 0000 0000

R/W, 0

R, 0

LEGEND: R = Read, W = Write, n = value after reset

Figure 3−19. USB APLL Clock Mode Register Bit Layout

Table 3−19. USB APLL Clock Mode Register Bit Functions

BIT

NO.

BIT

NAME

RESET

VALUE

FUNCTION

15−12

MULT

PLL Multiply Factor K. Multiply Factor K, combined with DIV and MODE, determines the final PLL output

clock frequency.

K = MULT[3:0] + 1

DIV

PLL Divide Factor (D) selection bit for PLL multiply mode operation. DIV, combined with K and MODE,

determines the final PLL output clock frequency. When the PLL is operating in multiply mode:

DIV = 0

PLL Divide Factor D = 1

DIV = 1

PLL Divide Factor D = 2 if K is odd

PLL Divide Factor D = 4 if K is even

10−3

COUNT

8-bit counter for PLL lock timer. When the MODE bit is set to 1, the COUNT field starts decrementing by 1

at the rate of CLKIN/16. When COUNT decrements to 0, the STAT bit is set to 1 and the PLL enabled clock

is sourced to the USB module.

TMS320VC5509APGE Datasheet(PDF) 52 Page - Texas Instruments

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