M52259 EVB board external RAM

[JackD]

Hi,

I just bougt a M52259EVB board and do not know how to access the on board MRAM.

I loaded my own code to read the MRAM (CS0 configured as an 8-bit port), but it would lock me in "Access Error Excpetion".

I notice that there is a CPLD residing on the same bus but could not find its equations from the CD shipped with the board.

I configured the Mini-bus as:

MCF_FBCS0_CSAR=0x80000000; //CS0 base address 0x80000000
MCF_FBCS0_CSCR=0x003F3D40; //15WS, AA, 8 bit
MCF_FBCS0_CSMR=0x00070001; //CS0 512KB and validate

I do not know what I did wrong and please help.

Thanks a lot.

Message Edited by JackD on 2009-07-13 10:31 PM

[mjbcswitzerland]

Hi JackD

You can find some information about using the MRAM here:

http://www.utasker.com/forum/index.php?topic=504.0

http://www.utasker.com/forum/index.php?topic=596.0

Here is some code which was used to configure for the above tests:

    fnConfigureBus(0, 2);                                                // configure the FlexBus interface accordingly with 1:2 clocking and 2 wait states  // Configuration of FlexBus for MRAM use. This serves as reference in case of a requirement for a more general interface//static void fnConfigureBus(int iSpeed, int iWaitStates){    unsigned long ulMask = 0x0000ffff;    unsigned long ulMaskPower = 0x00010000;    unsigned long ulSize = SIZE_OF_NVRAM;    #if defined USB_BIGENDIAN    unsigned short usExtendedMode = USB_END;    #else    unsigned short usExtendedMode = 0;    #endif    POWER_UP(POWER_MINI_FLEXBUS);                                        // power up the mini-flex bus module    if (iSpeed != 0) {                                                   // FlexBus should be clocked from system clock rather than half clock        usExtendedMode |= MBMOD;    }                                                                         // configure the port lines for non-multiplexed FlexBus    PTEPAR = 0xff;                                                       // address A0..A7    PTFPAR = 0xff;                                                       // address A8..A15    PTGPAR = (0x0f | ((PRIMARY_FUNCTION_D << BIT_7_D_SHIFT) | (PRIMARY_FUNCTION_D << BIT_6_D_SHIFT) | (PRIMARY_FUNCTION_D << BIT_5_D_SHIFT))); // A16..A19, D0, D1, CS_B    PTHPAR = ((PRIMARY_FUNCTION_Q << (2 * 0)) | (PRIMARY_FUNCTION_Q << (2 * 1)) | (PRIMARY_FUNCTION_Q << (2 * 2)) | (PRIMARY_FUNCTION_Q << (2 * 3)) | (PRIMARY_FUNCTION_Q << (2 * 4)) | (PRIMARY_FUNCTION_Q << (2 * 5)) | (PRIMARY_FUNCTION_Q << (2 * 6)) | (PRIMARY_FUNCTION_Q << (2 * 7))); // data D2..D7, OE_B, RW_B                                                                         // configure the chip select    CSAR0 = (START_OF_FLASH + SIZE_OF_FLASH);                            // position immediately after internal FLASH in the memory map    while (ulSize > ulMaskPower) {        ulMask <<= 1;        ulSize -= ulMaskPower;        ulMaskPower <<= 1;    }    CSMR0 = ((ulMask & BAM_MASK) | FB_CS_VALID);    CSCR0 = (PORT_SIZE_8 | FB_AA | BSTW | BSTR | ((iWaitStates << WAIT_STATE_SHIFT) & WAIT_STATE_MASK));    CCM_CCE = usExtendedMode;                                            // set the extended setting - note that this register can only be written once after a reset!}

Regards

Mark

www.uTasker.com
- OS, TCP/IP stack, USB, device drivers and simulator for M521X, M521XX, M5221X, M5222X, M5223X, M5225X. One package does them all - "Embedding it better..."
 

[JackD · Accepted solution]

Thanks Mark.

I found the problem. I disabled CS1 and the on-board CPLD would corrupt the Mini-bus. After active CS1 it works fine.

[alex1954]

Can I connect FPGA to MCF52259 such as external RAM ?