How to choose for read FIFO SPI interface for AD6641?

Hi,

Here are some more specific answers:

1 How to choose for read FIFO SPI interface for AD6641? In which register of SPI and what values we need to write?

FIFO readback via SPI is always enabled with 0x107[1:0] = 0x00.

    write_reg(0x107, 0x00) // Set to SPI Readback

    write_reg(0x102, 0x04) // Fill Reset

    write_reg(0x102, 0x08) // Dump Reset

    n = int(floor(num_samples/64)) – 1

    write_reg(0x104, n) // Write the Number of samples.

    write_reg(0x102, 0x01) // Initiate FILL

    status = read_reg(0x10A)    // Read the status

    // Keep Reading the status until status[0] == 1 (full)

   write_reg(0x102 , 0x02) // Initiate dump

    int data_array[num_samples] // Initialize readback array

    for (int i=0 ; i < num_samples ; ++i) {

        low_byte = read_reg(0x10B)

        high_byte = read_reg(0x10C)

        data_array[i] = float(high_byte * 256 + low_byte)

    }

    write_reg(0x102, 0x00) // Clear the dump bit

2 How to choose the SPORT interface? In which register of SPI and what values we need to write?  Set  address 0x107 [1:0] =10 for SPORT

3  How to initialize a fill command through the SPI port without standby? In which register of SPI and what values we need to write?  To initiate a fill, set address 0x102[0] =1

4 How to use bits of the register 0x102?     See above in (1).

I would be interested to understand why you are not using the data capture card.  Was there a problem procuring this?

Regards,

David

Hi,

Here are some more specific answers:

1 How to choose for read FIFO SPI interface for AD6641? In which register of SPI and what values we need to write?

FIFO readback via SPI is always enabled with 0x107[1:0] = 0x00.

    write_reg(0x107, 0x00) // Set to SPI Readback

    write_reg(0x102, 0x04) // Fill Reset

    write_reg(0x102, 0x08) // Dump Reset

    n = int(floor(num_samples/64)) – 1

    write_reg(0x104, n) // Write the Number of samples.

    write_reg(0x102, 0x01) // Initiate FILL

    status = read_reg(0x10A)    // Read the status

    // Keep Reading the status until status[0] == 1 (full)

   write_reg(0x102 , 0x02) // Initiate dump

    int data_array[num_samples] // Initialize readback array

    for (int i=0 ; i < num_samples ; ++i) {

        low_byte = read_reg(0x10B)

        high_byte = read_reg(0x10C)

        data_array[i] = float(high_byte * 256 + low_byte)

    }

    write_reg(0x102, 0x00) // Clear the dump bit

2 How to choose the SPORT interface? In which register of SPI and what values we need to write?  Set  address 0x107 [1:0] =10 for SPORT

3  How to initialize a fill command through the SPI port without standby? In which register of SPI and what values we need to write?  To initiate a fill, set address 0x102[0] =1

4 How to use bits of the register 0x102?     See above in (1).

I would be interested to understand why you are not using the data capture card.  Was there a problem procuring this?

Regards,

David