DS64BR401,pdf datasheet (Quad

The DS64BR401 is a quad lane bi-directional signal conditioning
transceiver suitable for 6.0/3.0/1.5 Gbps SATA/SAS
and other high-speed bus applications with data rates up to
6.4 Gbps. The device performs both receive equalization and
transmit de-emphasis on each of its 8 channels to compensate
for channel loss, allowing maximum flexibility of physical
placement within a system. The receiver's continuous time
linear equalizer (CTLE) provides a boost of up to +33 dB at 3
GHz and is capable of opening an input eye that is completely
closed due to inter-symbol interference (ISI) induced by the
interconnect medium. The transmitter features a programmable
output de-emphasis driver and allows amplitude
voltage levels to be selected from 600 mVp-p to 1200 mVp-p
to suit multiple application scenarios. This Low Power Differential
Signaling (LPDS) output driver is a power efficient
implementation that maintains compatibility with AC coupled
CML receiver. The programmable settings can be applied via
pin settings or SMBus interface.