TMS320DM647 datasheet(67/166 Pages) TI

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6.4.5

PLL1 Controller Register Description(s)

6.5 PLL2 and PLL2 Controller

PLLV2

C162

C161

EMIFilter

+1.8V

560pF 0.1 F

DM647/DM648

PLL2

CLKIN2

PLLM

x20

PLLOUT

PLLREF

DDR2MemoryController

SYSCLK1(FromPLL Controller1)

TMS320DM647/TMS320DM648

Digital Media Processor

SPRS372 – MAY 2007

A summary of the PLL1 controller registers is shown in Table 6-9.

Table 6-9. PLL1 and Reset Controller Registers Memory Map

HEX ADDRESS RANGE

DESCRIPTION

0x020E 0000

PID

Peripheral Identification and Revision Information Register

0x020E 00E4

RSTYPE

Reset Type Register

0x020E 0100

PLLCTL

PLL Controller 1 Operations Control Register

0x020E 0110

PLLM

PLL Controller 1 Multiplier Control Register

0x020E 0114

PREDIV

PLL Pre-Divider Control Register

0x020E 011C

PLLDIV2

PLL Controller 1 Control-Divider 2 Register (SYSCLK2)

0x020E 0138

PLLCMD

PLL Controller 1 Command Register

0x020E 013C

PLLSTAT

PLL Controller 1 Status Register (Shows PLLC1 Status)

0x020E 0140

ALNCTL

PLL Controller Clock Align Control Register

0x020E 0144

DCHANGE

PLLDIV Ratio Change Status Register

0x020E 0150

SYSTAT

PLL Controller 1 System Clock Status 1 Register (Indicates SYSCLK on/off

Status)

0x020E 0160

PLLDIV4

PLL Controller 1 Control-Divider 4 Register (SYSCLK4)

The secondary PLL controller generates interface clocks for the DDR2 memory controller.

As shown in Figure 6-7, the PLL2 controller features a PLL multiplier controller. The PLL multiplier is fixed

to a x20 multiplier rate. PLL2 power is supplied externally via the PLL2 power supply (PLLV2). An external

PLL filter circuit must be added to PLLV2 as shown in Figure 6-7. The 1.8-V supply for the EMI filter must

be from the same 1.8-V power plane supplying the I/O power-supply pin, DVDD18. TI requires EMI filter

manufacturer Murata, part number NFM18CC222R1C3.

Figure 6-7. PLL Controller

All PLL external components (C161, C162, and the EMI Filter) should be placed as close to the C64x+

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