SDRAM interfacing Problem with lpc4357

tintuthomas — Fri, 30 Sep 2016 09:39:00 GMT

Hi all,

I am trying to interface SDRAM - AS4C8M16SA from Alliance, with LPC4357 (LQFP208 package). I'm not familiar with EMC or SDRAM. I got the RAM get initialized. But ,I cannot successfully write beyond 64 bytes into it. My connection details and initialization code are given below.

SDRAM Details

Alliance AS4C8M16SA
128M - 8M x 16 bit , 2M word x 16-bit x 4-bank
    CAS Latency: 2, or 3
     Burst Length: 1, 2, 4, 8, or full page
     Burst Type: Sequential or Interleaved
4096 refresh cycles/64ms

Connections

SDRAM LPC4357

DQ0 - DQ15 EMC_D0 - EMC_D15

A0 - A11 EMC_A1 - EMC_A12

BA0 EMC_A13

BA1 EMC_A14

RAS EMC_RAS

CAS EMC_CAS

CS EMC_DYCS0

WE EMC_WE

NC/RFU NC

LDQM EMC_DQMOUT0

UDQM EMC_DQMOUT1

CLK EMC_CLK0

CKE EMC_CKEOUT0

Note: EMC_A6, EMC_A7, EMC_A8 and EMC_A0 pins are connected to some pull-up circuits to select the ISP method. The connection picture is attached.

Code

void SDRAM_Init () {
   uint32_t pclk, temp;
   uint32_t tmpclk;
   TIM_TIMERCFG_Type TIM_ConfigStruct;

   /* Set up EMC pin */
   scu_pinmux(   1   ,   0   ,   MD_PLN_FAST   ,   2   );   //A5
   scu_pinmux(   1   ,   1   ,   MD_PLN_FAST   ,   2   );   //A6
   scu_pinmux(   1   ,   2   ,   MD_PLN_FAST   ,   2   );   //A7
   scu_pinmux(   1   ,   3   ,   MD_PLN_FAST   ,   3   );   //OE
   scu_pinmux(   1   ,   4   ,   MD_PLN_FAST   ,   3   );   //BLS0
   scu_pinmux(   1   ,   5   ,   MD_PLN_FAST   ,   3   );   //CS0
   scu_pinmux(   1   ,   6   ,   MD_PLN_FAST   ,   3   );   //WE
   scu_pinmux(   1   ,   7   ,   MD_PLN_FAST   ,   3   );//D0
   scu_pinmux(   1   ,   8   ,   MD_PLN_FAST   ,   3   );//D1
   scu_pinmux(   1   ,   9   ,   MD_PLN_FAST   ,   3   );//D2
   scu_pinmux(   1   ,   10   ,   MD_PLN_FAST   ,   3   );//D3
   scu_pinmux(   1   ,   11   ,   MD_PLN_FAST   ,   3   );//D4
   scu_pinmux(   1   ,   12   ,   MD_PLN_FAST   ,   3   );//D5
   scu_pinmux(   1   ,   13   ,   MD_PLN_FAST   ,   3   );//D6
   scu_pinmux(   1   ,   14   ,   MD_PLN_FAST   ,   3   );//D7
   scu_pinmux(   2   ,   0   ,   MD_PLN_FAST   ,   2   );//A13
   scu_pinmux(   2   ,   1   ,   MD_PLN_FAST   ,   2   );//A12
   scu_pinmux(   2   ,   2   ,   MD_PLN_FAST   ,   2   );//A11
   scu_pinmux(   2   ,   6   ,   MD_PLN_FAST   ,   2   );//A10
   scu_pinmux(   2   ,   7   ,   MD_PLN_FAST   ,   3   );//A9
   scu_pinmux(   2   ,   8   ,   MD_PLN_FAST   ,   3   );//A8
   scu_pinmux(   2   ,   9   ,   MD_PLN_FAST   ,   0   );//A0// changed as GPIO
   scu_pinmux(   2   ,   10   ,   MD_PLN_FAST   ,   3   );//A1
   scu_pinmux(   2   ,   11   ,   MD_PLN_FAST   ,   3   );//A2
   scu_pinmux(   2   ,   12   ,   MD_PLN_FAST   ,   3   );//A3
   scu_pinmux(   2   ,   13   ,   MD_PLN_FAST   ,   3   );//A4
   scu_pinmux(   5   ,   0   ,   MD_PLN_FAST   ,   2   );//D12
   scu_pinmux(   5   ,   1   ,   MD_PLN_FAST   ,   2   );//D13
   scu_pinmux(   5   ,   2   ,   MD_PLN_FAST   ,   2   );//D14
   scu_pinmux(   5   ,   3   ,   MD_PLN_FAST   ,   2   );//D15
   scu_pinmux(   5   ,   4   ,   MD_PLN_FAST   ,   2   );//D8
   scu_pinmux(   5   ,   5   ,   MD_PLN_FAST   ,   2   );//D9
   scu_pinmux(   5   ,   6   ,   MD_PLN_FAST   ,   2   );//D10
   scu_pinmux(   5   ,   7   ,   MD_PLN_FAST   ,   2   );//D11
   scu_pinmux(   6   ,   1   ,   MD_PLN_FAST   ,   1   );//DYCS1
   scu_pinmux(   6   ,   3   ,   MD_PLN_FAST   ,   3   );//CS1
   scu_pinmux(   6   ,   4   ,   MD_PLN_FAST   ,   3   );//CAS
   scu_pinmux(   6   ,   5   ,   MD_PLN_FAST   ,   3   );//RAS
   scu_pinmux(   6   ,   6   ,   MD_PLN_FAST   ,   1   );//BLS1
   scu_pinmux(   6   ,   7   ,   MD_PLN_FAST   ,   1   );//A15
   scu_pinmux(   6   ,   8   ,   MD_PLN_FAST   ,   1   );//A14
   scu_pinmux(   6   ,   9   ,   MD_PLN_FAST   ,   3   );//DYCS0
   scu_pinmux(   6   ,   10   ,   MD_PLN_FAST   ,   3   );//DQMOUT1
   scu_pinmux(   6   ,   11   ,   MD_PLN_FAST   ,   3   );//CKEOUT0
   scu_pinmux(   6   ,   12   ,   MD_PLN_FAST   ,   3   );//DQMOUT0
   scu_pinmux(   10   ,   4   ,   MD_PLN_FAST   ,   3   );//A23
   scu_pinmux(   13   ,   0   ,   MD_PLN_FAST   ,   2   );
   scu_pinmux(   13   ,   2   ,   MD_PLN_FAST   ,   2   );
   scu_pinmux(   13   ,   3   ,   MD_PLN_FAST   ,   2   );
   scu_pinmux(   13   ,   4   ,   MD_PLN_FAST   ,   2   );
   scu_pinmux(   13   ,   5   ,   MD_PLN_FAST   ,   2   );
   scu_pinmux(   13   ,   6   ,   MD_PLN_FAST   ,   2   );
   scu_pinmux(   13   ,   7   ,   MD_PLN_FAST   ,   2   );
   scu_pinmux(   13   ,   8   ,   MD_PLN_FAST   ,   2   );
   scu_pinmux(   13   ,   9   ,   MD_PLN_FAST   ,   2   );
   scu_pinmux(   13   ,   10   ,   MD_PLN_FAST   ,   2   );
   scu_pinmux(   13   ,   12   ,   MD_PLN_FAST   ,   2   );
   scu_pinmux(   13   ,   13   ,   MD_PLN_FAST   ,   2   );//
   scu_pinmux(   13   ,   11   ,   MD_PLN_FAST   ,   2   );//CS3
   scu_pinmux(   13   ,   14   ,   MD_PLN_FAST   ,   2   );//DYCS2
   scu_pinmux(   13   ,   15   ,   MD_PLN_FAST   ,   2   );//A17
   scu_pinmux(   13   ,   16   ,   MD_PLN_FAST   ,   2   );//A16
   scu_pinmux(   14   ,   0   ,   MD_PLN_FAST   ,   3   );//A18
   scu_pinmux(   14   ,   1   ,   MD_PLN_FAST   ,   3   );//A19
   scu_pinmux(   14   ,   2   ,   MD_PLN_FAST   ,   3   );//A20
   scu_pinmux(   14   ,   3   ,   MD_PLN_FAST   ,   3   );//A21
   scu_pinmux(   14   ,   4   ,   MD_PLN_FAST   ,   3   );//A22
   scu_pinmux(   14   ,   5   ,   MD_PLN_FAST   ,   3   );
   scu_pinmux(   14   ,   6   ,   MD_PLN_FAST   ,   3   );
   scu_pinmux(   14   ,   7   ,   MD_PLN_FAST   ,   3   );
   scu_pinmux(   14   ,   8   ,   MD_PLN_FAST   ,   3   );
   scu_pinmux(   14   ,   9   ,   MD_PLN_FAST   ,   3   );
   scu_pinmux(   14   ,   10   ,   MD_PLN_FAST   ,   3   );
   scu_pinmux(   14   ,   11   ,   MD_PLN_FAST   ,   3   );
   scu_pinmux(   14   ,   12   ,   MD_PLN_FAST   ,   3   );
   scu_pinmux(   14   ,   13   ,   MD_PLN_FAST   ,   3   );

   /* Select EMC clock-out */
   LPC_SCU->SFSCLK_0 = MD_PLN_FAST;
   LPC_SCU->SFSCLK_1 = MD_PLN_FAST;
   LPC_SCU->SFSCLK_2 = MD_PLN_FAST;
   LPC_SCU->SFSCLK_3 = MD_PLN_FAST;

TIM_ConfigStruct.PrescaleOption = TIM_PRESCALE_USVAL;
TIM_ConfigStruct.PrescaleValue = 1;

// Set configuration for Tim_config and Tim_MatchConfig
TIM_Init(LPC_TIMER0, TIM_TIMER_MODE,&TIM_ConfigStruct);

   LPC_EMC->CONTROL    = 0x00000001;
   LPC_EMC->CONFIG     = 0x00000000;
   LPC_EMC->DYNAMICCONFIG0    = 0<<19 | 1<<12 | 1<<10 | 1<<7; /* 128Mb, 8Mx16, 4 banks, row=12, column=9 */

pclk = CGU_GetPCLKFrequency(CGU_PERIPHERAL_M4CORE);

   _DBG("pclk = ");
   _DBD32(pclk);

   LPC_EMC->DYNAMICRASCAS0    = 0x00000303; /* 1 RAS, 3 CAS latency */
   LPC_EMC->DYNAMICREADCONFIG = 0x00000001; /* Command delayed strategy, using EMCCLKDELAY */

   LPC_EMC->DYNAMICRP         = NS2CLK(pclk, 20);
   LPC_EMC->DYNAMICRAS        = NS2CLK(pclk, 42);
   LPC_EMC->DYNAMICSREX       = NS2CLK(pclk, 63);
   LPC_EMC->DYNAMICAPR        = 0x00000005;
   LPC_EMC->DYNAMICDAL        = 0x00000005;
   LPC_EMC->DYNAMICWR         = 2;
   LPC_EMC->DYNAMICRC         = NS2CLK(pclk, 63);
   LPC_EMC->DYNAMICRFC        = NS2CLK(pclk, 63);
   LPC_EMC->DYNAMICXSR        = NS2CLK(pclk, 63);
   LPC_EMC->DYNAMICRRD        = NS2CLK(pclk, 14);
   LPC_EMC->DYNAMICMRD        = 0x00000002;

TIM_Waitus(100); /* wait 100ms */
LPC_EMC->DYNAMICCONTROL = 0x00000183; /* Issue NOP command */

   TIM_Waitus(200);                           /* wait 200ms */
   LPC_EMC->DYNAMICCONTROL    = 0x00000103; /* Issue PALL command */

LPC_EMC->DYNAMICREFRESH = EMC_SDRAM_REFRESH(pclk,70); /* ( n * 16 ) -> 32 clock cycles */

//for(i = 0; i < 0x80; i++); /* wait 128 AHB clock cycles */
TIM_Waitus(200); /* wait 200ms */

tmpclk = (uint32_t)15625*(uint32_t)pclk/1000000000/16;
LPC_EMC->DYNAMICREFRESH = tmpclk; /* ( n * 16 ) -> 736 clock cycles -> 15.330uS at 48MHz <= 15.625uS ( 64ms / 4096 row ) */

LPC_EMC->DYNAMICCONTROL = 0x00000083; /* Issue MODE command */

   //Timing for 48/60/72MHZ Bus
   temp = *((volatile uint32_t *) 0x28023000);//(SDRAM_ADDR_BASE | (0x23<<12)) );//(3<<4| 3)<<11)); /* 4 burst, 3 CAS latency */
   temp = temp;
   LPC_EMC->DYNAMICCONTROL    = 0x00000000; /* Issue NORMAL command */

//[re]enable buffers
LPC_EMC->DYNAMICCONFIG0 |= 1<<19;

}

after init, i used this code

#define FRAMEBUFFER_ADDR 0x28000000

len = 64;

memcpy((uint8_t *)FRAMEBUFFER_ADDR,Buffer720,len);

This will successfully copy 64 bytes. Length above 64 is not working.

Also, if the code is like this, I can copy upto 256 Bytes.

len = 64;

    for( i=0;i<4;i++)
   {
       memcpy((uint8_t *)FRAMEBUFFER_ADDR+(i*64),Buffer720+(i*64),len);

memcmp(FrameBuff,(uint8_t *)FRAMEBUFFER_ADDR+(i*64),len);

}

ie, if reading the values after each 64 bytes, it can copy upto 256 Bytes.

What is wrong in this? Can anyone help me to solve this?

Re: SDRAM interfacing Problem with lpc4357

ursaminor — Sun, 02 Oct 2016 08:36:09 GMT

You set DYNAMICRASCAS0=0x303, so the SDRAM mode word for a 16-bit bus is 0x33, not 0x23. (CAS=3, burst length=8).

You set DYNAMICCONFIG0=0x1480, which selects BRC addressing. In this case you must set the mode register by a dummy read from address 0x28000000+(0x33 << 10).

If you want high-performance mode (RBC addressing), set DYNAMICCONFIG0=0x0480, and use address 0x28000000+(0x33 << 12) for the mode register.

I assume you have hooked up the SDRAM bank selects to A13 and A14.

EDIT: just saw you have shown that in the connection list. However, is it true that you have connected A1...A12 to the SDRAM? This must be A0...A11!

Re: SDRAM interfacing Problem with lpc4357

tintuthomas — Mon, 03 Oct 2016 10:01:46 GMT

Hi ursaminor‌,

You set DYNAMICRASCAS0=0x303, so the SDRAM mode word for a 16-bit bus is 0x33, not 0x23. (CAS=3, burst length=8).

You set DYNAMICCONFIG0=0x1480, which selects BRC addressing. In this case you must set the mode register by a dummy read from address 0x28000000+(0x33 << 10).
If you want high-performance mode (RBC addressing), set DYNAMICCONFIG0=0x0480, and use address 0x28000000+(0x33 << 12) for the mode register.

I changed the code as u said. Still no change.

I assume you have hooked up the SDRAM bank selects to A13 and A14.

Yes BA0 to A13 and BA1 to A14.

EDIT: just saw you have shown that in the connection list. However, is it true that you have connected A1...A12 to the SDRAM? This must be A0...A11!

At first I connected A0 to A11. That was also not working . So after some reading , I found this post https://www.lpcware.com/content/forum/lpc43xx-interface-sdram.

In this on a comment bavarian says like this ,

"a 16-bit device normally starts with a connection of MCU_ADDR_1 to its A0 pin.
With a 16-bit device you don't use MCU_ADDR_0 at all, the byte addressing is done with LB and UB."

And I could see a connection picture in User manual UM10503 section 23.8.6 External static memory interface

Here it shows connection from MCU as A[a_b:1] . Is it applicable to Dynamic memories?

Anyway both connections are not working...

Re: SDRAM interfacing Problem with lpc4357

soledad — Wed, 09 Nov 2016 21:27:21 GMT

Hi,

Please check the AN11508, this application note describes how to properly interface SDRAM memory to the LPC1800 and LPC4300 External Memory Controller.

http://cache.nxp.com/documents/application_note/AN11508.pdf

I hope this helps!!

Have a great day,
Sol

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