SM320C6455-EP

FIXED-POINT DIGITAL SIGNAL PROCESSOR

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SPRS462B – SEPTEMBER 2007 – REVISED JANUARY 2008

7.7.3.9 PLLDIV Ratio Change Status Register

Whenever a different ratio is written to the PLLDIVn registers, the PLLCTRL flags the change in the PLLDIV ratio change status registers (DCHANGE). During the GO operation, the PLL controller will only change the divide ratio of the SYSCLKs with the bit set in DCHANGE. Note that changed clocks will be automatically aligned to other clocks. The PLLDIV divider ratio change status register is shown in Figure 7-19and described in Table 7-27.

31

 

 

 

 

 

 

16

 

 

 

Reserved

 

 

 

 

 

 

 

R-0

 

 

 

 

15

 

 

5

4

3

2

0

 

 

 

Reserved

SYS5

SYS4

Reserved

 

 

 

 

R-0

R-0

R-0

R-0

 

LEGEND: R/W = Read/Write; R = Read only; -n= value after reset

 

 

 

 

 

Figure 7-19. PLLDIV Divider Ratio Change Status Register (DCHANGE) [Hex Address: 029A 0144]

 

Table 7-27. PLLDIV Divider Ratio Change Status Register (DCHANGE) Field Descriptions

 

Bit

Field

Value

Description

 

 

 

 

31:5

Reserved

0

Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.

4

SYS5

 

Identifies when the SYSCLK5 divide ratio has been modified.

 

 

 

 

 

0

SYSCLK5 ratio has not been modified. When GOSET is set, SYSCLK5 will not be affected.

 

 

 

1

SYSCLK5 ratio has been modified. When GOSET is set, SYSCLK5 will change to the new ratio.

3

SYS4

 

Identifies when the SYSCLK4 divide ratio has been modified.

 

 

 

 

 

0

SYSCLK4 ratio has not been modified. When GOSET is set, SYSCLK4 will not be affected.

 

 

 

1

SYSCLK4 ratio has been modified. When GOSET is set, SYSCLK4 will change to the new ratio.

2:0

Reserved

0

Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.

148

C64x+ Peripheral Information and Electrical Specifications

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Texas Instruments SM320C6455-EP manual Plldiv Ratio Change Status Register, SYS5 SYS4