BUS Configuration

The BUS can be configured using predefined functions (for example, _WBYTE or _WDWORD) that write to the target memory. Use these functions in pre-download scripts. Some devices require a BUS configuration prior to accessing attached devices. Typically, this is true for external Flash ROM devices. For example:

_WDWORD(0xFFE00000, 0x20003CE3);   // BCFG0: Flash Bus Configuration
_WDWORD(0xE002C014, 0x0E6001E4);   // PINSEL2: CS0, OE, WE, BLS0..3

Functions can use the Configuration Wizard syntax to create a menu-driven configuration file:

/***********************************************************************/
/*  FLASH.INI: Flash Initialization File                               */
/***********************************************************************/

//*** Use Configuration Wizard in Context Menu ***

FUNC void Setup (void) {

// External Memory Controller (EMC)
//   Bank Configuration 0 (BCFG0)
//     IDCY: Idle Cycles (0-15)
//     WST1: Wait States 1 (0-31)
//     WST2: Wait States 2 (0-31)
//     RBLE: Read Byte Lane Enable
//     WP: Write Protect
//     BM: Burst ROM
//     MW: Memory Width  0=8-bit  1=16-bit
//                       2=32-bit 3=Reserved
//
  _WDWORD(0xFFE00000, 0x20003CE3);   // BCFG0: Flash Bus Configuration

  _WDWORD(0xE002C014, 0x0E6001E4);   // PINSEL2: CS0, OE, WE, BLS0..3
                                     //          D0..31, A2..23, JTAG
}

Setup();                             // Setup for Flash