TI-AM335X GPMC 7個(gè)config寄存器重點(diǎn)

1、每個(gè)Config寄存器有32位Config1：1-0 GPMCFCLKDIVIDER Divides the GPMC.FCLK clock/用于設(shè)置時(shí)鐘 使用默認(rèn)00 GPMC_CLK frequency = GPMC_FCLK frequency1h GPMC_CLK frequency = GPMC_FCLK frequency/22h GPMC_CLK frequency = GPMC_FCLK frequency/33h GPMC_CLK frequency = GPMC_FCLK frequency/44 TIMEPARAGRANULARITY Signals timing lat

2、encies scalar factor (Rd/WRCycleTime, AccessTime,PageBurstAccessTime, CSOnTime, CSRd/WrOffTime, ADVOnTime,/設(shè)置時(shí)間速度有關(guān)，沒懂，默認(rèn)0ADVRd/WrOffTime, OEOnTime, OEOffTime, WEOnTime, WEOffTime,Cycle2CycleDelay, BusTurnAround, TimeOutStartValue)0 ×1 latencies1 ×2 latencies9-8 MUXADDDATA Enables the Addr

3、ess and data multiplexed protocol (Reset value is CS0MUXDEVICE input pin sampled at IC reset for CS0 and 0 for CS1-5)/使用默認(rèn) 00 Non-multiplexed attached device1h AAD-multiplexed protocol device2h Address and data multiplexed attached device3h Reserved11-10 DEVICETYPE Selects the attached device type/默

4、認(rèn)0，我的是SRAM0 NOR Flash like, asynchronous and synchronous devices1h Reserved2h NAND Flash like devices, stream mode3h Reserved13-12 DEVICESIZE Selects the device size attached (Reset value is BOOTDEVICESIZE input/終于自己設(shè)置了，要操作的ram是16位的，當(dāng)然以后操作別的ram就改為其它的pin sampled at IC reset for CS0 and 01 for CS1-5)0

5、 8 bit1h 16 bit2h Reserved3h Reserved28 WRITEMULTIPLE Selects the write single or multiple access/28 30設(shè)置讀寫為單個(gè)或復(fù)用？有點(diǎn)不肯定，但這里都設(shè)置為00 Single access1 Multiple access (burst if synchronous, considered as single if asynchronous)30 READMULTIPLE Selects the read single or multiple access 0 single access1 mul

6、tiple access (burst if synchonous, page if asynchronous)config2-6:/按照芯片手冊(cè)757頁時(shí)序圖配置config7:5-0 BASEADDRESS 0-3Fh Chip-select base address./設(shè)置為0x10；A24設(shè)置為有效CSi base address where i = 0 to 3 (16 Mbytes minimum granularity). Bits 5-0 correspondsto A29, A28, A27, A26, A25, and A24.11-8 MASKADDRESS Chip-select mask address. Values not listed must be avoided as they create holes in the chip-select address space./默認(rèn)設(shè)置為00 Chip-select size of 256 Mbytes8h Chip-select size of 12