> A BoW PHY slice either transmits or receives 16 bits of data between die. The BoW is a source-synchronous PHY and each transmitting PHY slice transmits a complementary clock signal CLK+ and CLK- with the data. A BoW PHY optionally has two additional wires designated FEC (for Forward Error Correction) and AUX, for other optional functions such as Data Bus Inversion (DBI).
Summary, in the spec’s own words:
> A BoW PHY slice either transmits or receives 16 bits of data between die. The BoW is a source-synchronous PHY and each transmitting PHY slice transmits a complementary clock signal CLK+ and CLK- with the data. A BoW PHY optionally has two additional wires designated FEC (for Forward Error Correction) and AUX, for other optional functions such as Data Bus Inversion (DBI).