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Hardware
3.2
DDR SDRAM
Each MSC711x device has a dedicated 16-bit (DDR synchronous dynamic random access memory
(SDRAM) device for external memory storage. These devices provide 16 Mbyte of external memory to
each device. The memory devices connect to the dedicated DDR SDRAM interface on each MSC711x
device. Example 1 shows the basic initialization code for the Micron DDR SRAM memory as connected
on the SPT711xPFCE. These devices are Micron part number MT46V8M16P-6T. For information on
these devices, refer to the Micron web site at http:// www.micron.com .
Example 1. Micron DDR Initialization Code
typedef struct
{
unsigned int UP;
unsigned int START;
unsigned int BYTES;
unsigned int WIDTH32;
unsigned int CS0CFG;
unsigned int TCFG1;
unsigned int TCFG2;
unsigned int SMCFG;
unsigned int SICFG;
unsigned int SCFG;
}
t_DDR_PARAMETERS;
t_DDR_PARAMETERS DDR_PARAMETERS;
#define
#define
#define
#define
#define
#define
#define
#define
#define
#define
DDR_DEFAULT_UP 0
DDR_DEFAULT_START 0x20000000
DDR_DEFAULT_BYTES 0x01000000
DDR_DEFAULT_32BIT 0
DDR_DEFAULT_CS0CFG 0x80000001
DDR_DEFAULT_TCFG1 0x38345331
DDR_DEFAULT_TCFG2 0x00000400
DDR_DEFAULT_SMCFG 0x10000062
DDR_DEFAULT_SICFG 0x0490007F
DDR_DEFAULT_SCFG 0x42000000
// Initialize Global Variables
DDR_PARAMETERS.UP = DDR_DEFAULT_UP;
DDR_PARAMETERS.START = DDR_DEFAULT_START;
DDR_PARAMETERS.BYTES = DDR_DEFAULT_BYTES;
DDR_PARAMETERS.WIDTH32 = DDR_DEFAULT_32BIT;
DDR_PARAMETERS.CS0CFG = DDR_DEFAULT_CS0CFG;
DDR_PARAMETERS.TCFG1 = DDR_DEFAULT_TCFG1;
DDR_PARAMETERS.TCFG2 = DDR_DEFAULT_TCFG2;
DDR_PARAMETERS.SMCFG = DDR_DEFAULT_SMCFG;
DDR_PARAMETERS.SICFG = DDR_DEFAULT_SICFG;
DDR_PARAMETERS.SCFG = DDR_DEFAULT_SCFG;
#if (DDR_DEFAULT_UP)
// Default is up, so insert the code to bring it up.
DDR_UP(&DDR_PARAMETERS);
#endif
MSC711x Packet Telephony Farm Card (SPT711xPFCE), Rev. 1
Freescale Semiconductor
11
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