Hi,

I am using FT4222H-SPI-Slave to send data to an SPI-Master. As you know FT4222H-SPI-Slave appends a dummy byte (0x00) at the first byte automatically.

The master word size is 32-bit, so first I send 3 dummy bytes (0x000000), and then I send the actual data (I want the master to receive first a whole dummy word and then receive the actual data).

So I use FT4222_SPISlave_Write() twice and then notify the master to receive the data, as follows:
1. Call FT4222_SPISlave_Write() to buffer the 3 dummy bytes
2. Call FT4222_SPISlave_Write() again to buffer the actual data (two words: 0xAAAAAAAA, 0xBBBBBBBB)
3. Notify the master to receive the data

Results:
1. If the master receives the 3 words from FT4222H-SPI-Slave in one transaction, then it receives { 0x00000000, 0x00000000, 0x00000000 }
2. But if I modified the master code to receive each word in a separate transaction, then it receives { 0x00000000, 0x00AAAAAA, 0xAABBBBBB }

Question-1: Why FT4222H-SPI-Slave doesn't send the data correctly in the one transaction manner?
Question-2: Why FT4222H-SPI-Slave appends a dummy byte in the second word (0x00AAAAAA) in the multiple transactions manner?

Kindly, find attached the analyzer screenshots.