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 properly.
Results
The Reference text in Buffer720 is
"Software that is described herein is for illustrative purposes only which provides customers with programming information regarding the products."
1. when copying 64 bytes
expected :
"Software that is described herein is for illustrative purposes o"
actual :
"Software that is described herein is for illustrative purposes o"
2. when copying 128 bytes
expected :
"Software that is described herein is for illustrative purposes only which provides customers with programming information regard"
actual :
"ed herei describ described hereirposes oative puative purposes omers wites custoes customers witn regardf ormatioformation regard "
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?
