Maxtor Atlas 10K V Product Manual page 116

The TRANSCEIVER MODE field specifies the current bus mode of the target as
defined in Table 5-79.
Code
00b
01b
10b
11b
The SENT PCOMP_EN bit contains the value of the PCOMP_EN bit sent by the
target for the current I_T nexus.
The RECEIVED PCOMP_EN bit contains the value of the PCOMP_EN bit
received by the target for the current I_T nexus.
5-58 Maxtor Atlas 10K V
Table 5-79
Transceiver Mode
Transceiver Mode
Unknown (device not capable of reporting bus mode)
Single-ended
Low-Voltage Differential
High-Voltage Differential