SST39VF3201无法读写

只看该作者 · 2013-3-26 17:50

设备ID也读不出来，无法编程，读的时候总是返回0x3A6E!有谁碰到过这种情况？
原理图，时序配置都检查过了，没发现问题？

只看该作者 · 2013-3-26 17:52

原理图如下！

G:\11.bmp

只看该作者 · 2013-3-26 17:55

G:\11.bmp

只看该作者 · 2013-3-26 17:55

原理图怎么传？

只看该作者 · 2013-3-26 17:56

附件？

只看该作者 · 2013-3-26 17:57

下面是读ID程序
DWORD Check_SST_39VF320X(void)
{
WORD Vendor_ID;
WORD Device_ID;
DWORD  ReturnStatus;

//  Issue Software ID Entry command to SST39VF320X
*(WORD *) (BaseAddrs + 0x5555 * AddrsShift) = 0x00AA;  // 1st write data 0x00AA to device addr 5555H
*(WORD *) (BaseAddrs + 0x2AAA * AddrsShift) = 0x0055;  // 2nd write data 0x0055 to device addr 2AAAH
*(WORD *) (BaseAddrs + 0x5555 * AddrsShift) = 0x0090;  // 3rd write data 0x0090 to device addr 5555H
Delay_150_Nano_Seconds();                            // delay Tida (max. 150ns) for SST39VF320X

Vendor_ID  = *(WORD *) (BaseAddrs + 0);             // read vendor ID
Device_ID  = *(WORD *) (BaseAddrs + 1 * AddrsShift); // read device ID

ReturnStatus = Vendor_ID * 65536 + Device_ID;

// Issue Software ID Exit command to put SST39VF320X into normal read mode.
*(WORD *) (BaseAddrs + 0x5555 * AddrsShift) = 0x00AA;  // 1st write data 0x00AA to device addr 5555H
*(WORD *) (BaseAddrs + 0x2AAA * AddrsShift) = 0x0055;  // 2nd write data 0x0055 to device addr 2AAAH
*(WORD *) (BaseAddrs + 0x5555 * AddrsShift) = 0x00F0;  // 3rd write data 0x00F0 to device addr 5555H
Delay_150_Nano_Seconds();                            // then delay Tida (max. 150ns) for SST39VF320X

return ReturnStatus;
}