FMPLL configuration for MPC5644A

[chandrasekarkri]

pls help anyone how to configure fmpll in mpc5644a by Fref =40 MHZ for Fsys=120MHZ

i configured but it not working in EVT board ..my configuration is

void FMPLL_config()

{

ECSM.MUDCR.R = 0x40000000; /* 1 SRAM waitstate for fsys above 98MHz */

FMPLL.ESYNCR2.R = 0x00000002;

FMPLL.ESYNCR1.R = 0xF0020024;

while (FMPLL.SYNSR.B.LOCK != 1) {}; /* Wait for FMPLL to LOCK */

FMPLL.ESYNCR2.R = 0x00000001; /* Fsys =120Mhz */

SIU.ECCR.R = 0x00001003; /* CLKOUT to /4 because of 66MHz limit */

}

[chandrasekarkri]

Hi David Tosenovjan,

Thanks..i solved it..

[chandrasekarkri]

Hi David Tosenovjan,

Thanks for your reply..i looked my board is XPC564AKIT324S uses 40MHz crystal.still it is not working..if there any jumper settings in that board for working Fmpll?

Thanks & Regards,

chandrasekar k

[davidtosenovjan]

Check jumpers J16 whether there aren't removed.

[chandrasekarkri]

Hi Martin Kovar,

I tested your code in  XPC564A 324BGA MINIMODULE BOARD(MPC5644A), but board is not responding..do you have any suggestions for this..

any jumper settings in this board or anything..

Regards,

Chandrasekar K

[davidtosenovjan]

Please, pay attention to following example code, function FMPLL_init:

https://community.freescale.com/docs/DOC-101455

Code selects used board at the beginning of main function by following macros:

#define XPC564AKIT176S 0

#define XPC564AKIT208S 1

#define XPC564AKIT324S 2

/* Choose one of 3 options above according to your configuration */

#define USED_BOARD XPC564AKIT324S

Possible issues are:

- XPC564AKIT176S and XPC564AKIT208S use 8MHz crystal

- XPC564AKIT324S uses 40MHz crystal

- 1 SRAM waitstate for fsys above 98MHz

- CLKOUT frequency must be 66MHz at most

[martin_kovar]

Hi,

try this configuration:

/* Set sysclk = 120MHz running from PLL with 40 MHz crystal reference. */

void initSysclk (void) {

      FMPLL.ESYNCR1.B.CLKCFG = 0X7;       /* Change clk to PLL normal mode from crystal */

      FMPLL.SYNCR.R = 0x22880000;                  /* Fsys =60Mhz */

      while (FMPLL.SYNSR.B.LOCK != 1) {}; /* Wait for FMPLL to LOCK  */

      FMPLL.SYNCR.R = 0x22800000;                  /* Fsys =120Mhz */

}

Regards,

Martin