TMS320F28388D: Is TXD1 and RXD1 necessary for FSI ?

Hi Longfei Zhang,

TXD1 and RXD1 are optional signals that are not required. Using the additional D1 data signals will increase the throughput of the FSI communications.

longfei zhang said:

If i just use TXCLK,TXD0,RXCLK and RXD0, can it work normally? is differential driver ic necessary for communication?

Differential ICs are not required for FSI to work. You can directly connect the FSI signals of the C2000 devices. Differential ICs will drastically increase the communication distance possible and increase noise immunity.

longfei zhang said:

if i don't use the differential driver ic as below,how much distance can it work normally?

It will largely depend on your operating environment and FSI clock speed being used. At the Max 50 MHz FSI clock, typically 5-6 inches (12-15 cm) of trace length is possible. We recommend using differential ICs in noisy system environments or for longer communication distances.

Best,

Kevin