[sdiy] Mismatch in word length with I2S (16/24 bits), it won't work ?

[Linium]

Hello,

I was reading the specs of the DIR1703, and discovered that this puppy will 
produce I2S digital out only in 24bit word.

I intended at first to use the DAC TDA1543 but the specs say it accepts 16bits 
I2S input.

Well, i am not very aware of the I2S format, but really i think it won't work.
The I2S word is composed of 2 start bits for nothing, then the signal is a LSB 
then a MSB. 

I am afraid that if a 24bits signal is received, the last byte will be 
ignored, and it is the most meaningfull...

Does some have an idea about this ? 

Well, i have a DAC PCM56U offered by TI as a replacement, but i will be happy 
to know if I2S is notoriously available as 16 and 24 word length.

Linium