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SRAM ãããã䜿çšæžã¿ (ã©ããæ¬ é¥ããããæšæž¬ããŠãã ãã)
ãã©ã³ã¹ã®ãšãã解決çã¯ã16 ããã ã¡ã¢ãª ãããã䜿çšããããšã§ãã æçµçã«ã¯ Integrated Silicon Solutions Inc. ã®ããããæ¡çšããŸããã (ISSI IS61LV25616ALã16 x 256kã10 nsã3.3 V)ã ãã¡ããããMilandrã瀟ã¯ç¬èªã®ã¹ã¿ãã£ãã¯ã¡ã¢ãªããããæã£ãŠããŸã
å€éšãã¹ãšã¹ã¿ã³ãã¢ãã³ ã¢ãŒãK1986BE1QI (èªç©º) ãã€ã¯ãã³ã³ãããŒã©ã«ã¯ç¬èªã®ã¹ã¿ã³ãã¢ãã³ ã¢ãŒãããããã³ã¢ããªã»ããç¶æ
ã«ãããšãã«ãå€éšãã¹çµç±ã§ã€ãŒãµãããããã³ MCIO ã³ã³ãããŒã© (MIL_STD_1553) ã«çŽæ¥å€éšã¢ã¯ã»ã¹ã§ããããã«èšèšãããŠããŸãã 䜿çšãããŠããªãã ãã®ã¢ãŒãã¯ãã€ãŒãµãããã MCIO ãæããªãããã»ããµã FPGA ã«åœ¹ç«ã¡ãŸãã
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- ããŒã¿ãã¹ MCU(D0-D15) => SRAM(I/O0-I/O15)ã
- ã¢ãã¬ã¹ãã¹ MCU(A1ïœA18) => SRAM(A0ïœA17)ã
- MCU å¶åŸ¡(nWRãnRDãPortC2) => SRAM (WEãOEãCE)ã
- SRAM(UBãLB) ã¯ãæµæãä»ããŠã°ã©ã³ãã«æ¥ç¶ãŸãã¯ãã«ãããŸãã
CE ã©ã€ã³ã¯æµæãä»ããŠé»æºã«ãã«ã¢ãããããŠãããMCU ãã€ã ãã§ãã ãã³ (BE0 ïœ BE3) ã¯äœ¿çšãããŸããã ã¹ãã€ã©ãŒã®äžã«ãããŒããšå€éšãã¹ ã³ã³ãããŒã©ãŒãåæåããããã®ã³ãŒãã瀺ããŸãã
ããŒããšEBCã³ã³ãããŒã©ãŒïŒå€éšãã¹ã³ã³ãããŒã©ãŒïŒã®åæå
void SRAM_Init (void)
{
EBC_InitTypeDef EBC_InitStruct = { 0 };
EBC_MemRegionInitTypeDef EBC_MemRegionInitStruct = { 0 };
PORT_InitTypeDef initStruct = { 0 };
RST_CLK_PCLKcmd (RST_CLK_PCLK_EBC, ENABLE);
PORT_StructInit (&initStruct);
//--------------------------------------------//
// DATA PA0..PA15 (D0..D15) //
//--------------------------------------------//
initStruct.PORT_MODE = PORT_MODE_DIGITAL;
initStruct.PORT_PD_SHM = PORT_PD_SHM_ON;
initStruct.PORT_SPEED = PORT_SPEED_FAST;
initStruct.PORT_FUNC = PORT_FUNC_MAIN;
initStruct.PORT_Pin = PORT_Pin_All;
PORT_Init (MDR_PORTA, &initStruct);
//--------------------------------------------//
// Address PF3-PF15 (A0..A12), A0 - not used. //
//--------------------------------------------//
initStruct.PORT_FUNC = PORT_FUNC_ALTER;
initStruct.PORT_Pin = PORT_Pin_4 | PORT_Pin_5 |
PORT_Pin_6 | PORT_Pin_7 |
PORT_Pin_8 | PORT_Pin_9 |
PORT_Pin_10 | PORT_Pin_11 |
PORT_Pin_12 | PORT_Pin_13 |
PORT_Pin_14 | PORT_Pin_15;
PORT_Init (MDR_PORTF, &initStruct);
//--------------------------------------------//
// Address PD3..PD0 (A13..A16) //
//--------------------------------------------//
initStruct.PORT_FUNC = PORT_FUNC_OVERRID;
initStruct.PORT_Pin = PORT_Pin_0 | PORT_Pin_1 |
PORT_Pin_2 | PORT_Pin_3;
PORT_Init (MDR_PORTD, &initStruct);
//--------------------------------------------//
// Address PE3, PE4 (A17, A18) //
//--------------------------------------------//
initStruct.PORT_FUNC = PORT_FUNC_ALTER;
initStruct.PORT_Pin = PORT_Pin_3 | PORT_Pin_4;
PORT_Init (MDR_PORTE, &initStruct);
//--------------------------------------------//
// Control PC0,PC1 (nWE,nOE) //
//--------------------------------------------//
initStruct.PORT_FUNC = PORT_FUNC_MAIN;
initStruct.PORT_Pin = PORT_Pin_0 | PORT_Pin_1;
PORT_Init (MDR_PORTC, &initStruct);
//--------------------------------------------//
// Control PC2 (nCE) //
//--------------------------------------------//
initStruct.PORT_PD = PORT_PD_DRIVER;
initStruct.PORT_OE = PORT_OE_OUT;
initStruct.PORT_FUNC = PORT_FUNC_PORT;
initStruct.PORT_Pin = MDB_SRAM_CE;
PORT_Init (MDR_PORTC, &initStruct);
//--------------------------------------------//
// Initialize EBC controler //
//--------------------------------------------//
EBC_DeInit();
EBC_StructInit(&EBC_InitStruct);
EBC_InitStruct.EBC_Mode = EBC_MODE_RAM;
EBC_InitStruct.EBC_WaitState = EBC_WAIT_STATE_3HCLK;
EBC_InitStruct.EBC_DataAlignment = EBC_EBC_DATA_ALIGNMENT_16;
EBC_Init(&EBC_InitStruct);
EBC_MemRegionStructInit(&EBC_MemRegionInitStruct);
EBC_MemRegionInitStruct.WS_Active = 2;
EBC_MemRegionInitStruct.WS_Setup = EBC_WS_SETUP_CYCLE_1HCLK;
EBC_MemRegionInitStruct.WS_Hold = EBC_WS_HOLD_CYCLE_1HCLK;
EBC_MemRegionInitStruct.Enable_Tune = ENABLE;
EBC_MemRegionInit (&EBC_MemRegionInitStruct, EBC_MEM_REGION_60000000);
EBC_MemRegionCMD(EBC_MEM_REGION_60000000, ENABLE);
// Turn ON RAM (nCE)
PORT_ResetBits (MDR_PORTC, MDB_SRAM_CE);
}
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