使用C232HM MPSSE读取M95128 EEPROM返回全0xFF问题求助

我使用搭载C232H MPSSE控制器的C232HM线缆读取M95128-DRMF4TG/K EEPROM，编写了如下C#代码：

private void ReadSPI(byte[] byteArray, int adress) //adress is 0x0100, bytearray has 998 Elements for 998 bytes to read
{
    byte msbAdress = (byte)(adress >> 8);
    byte lsbAdress = (byte)adress;
    // First send the adress needed to the EEPROM
    byte[] eepromSendData = new byte[] //Sending the EEPROM the command, that it shall return the data from the specific adress
    {
        0x10, 0x02, 0x00,
        0x03, msbAdress, lsbAdress
    };
    ftStatus = ftdiDevice.Write(eepromSendData, eepromSendData.Length, ref bytesWritten);

    
    byte msbLength = ((byte)(byteArray.Length >> 8));
    byte lsbLength = (byte)byteArray.Length;
    
    byte[] readCommand = new byte[] // readCommand for the C232H controller
    {
        0x20, lsbLength, msbLength
    };
    ftStatus = ftdiDevice.Write(readCommand, readCommand.Length, ref bytesWritten);
    ftStatus = ftdiDevice.Read(byteArray, (uint)byteArray.Length, ref bytesRead);

    if (ftStatus != FTDI.FT_STATUS.FT_OK || bytesRead != byteArray.Length)
    {
        MessageBox.Show("Error reading SPI");
        return;
    }
    bytesWritten = 0;
    bytesRead = 0;
}

但EEPROM返回的所有字节均为0xFF。经检测，eepromSendData已正确发送至EEPROM，CS引脚已激活，时钟可测，但SOMI引脚始终处于2.4V（Vcc为3.3V），推测EEPROM未发送数据。仅调用ftdiDevice.Read会导致程序冻结，必须写入readCommand以激活时钟。读取EEPROM不同区域结果一致。

附M95128 EEPROM中文数据手册（原英文手册已翻译）

内容的提问来源于stack exchange，提问作者Heimdall