XRS10L140 Datasheet | Exar

features such as staggered HDD spin-up, power management control, hot plug capability and support for legacy software. The XRS10L140 acts as a retimer, maintaining independent signaling domains between the drives themselves and the external interconnect. The high-speed serial input features selectable equalization adjustment and the high-speed serial output features selectable pre-emphasis to pensate for ISI (Inter-Symbol Interference) and increase maximum cable distances. XRS10L140 meets tight jitter budgets in SATA applications. Exar's serial I/O technology enables reliable data transmission over 1 meter or more of FR-4 and 15 meters or more of unequalized copper cable. Host and drive port speeds can be mixed and matched, based upon inherent data rate negotiation present in the SATA II specifications. The MDIO bus allows simple configuration of the device. To summarize, the XRT10L24 port multiplier device allows the system designer to increase the number of serial ATA connections in an enclosure that does not have a sufficient number of serial ATA connections for all of the drives in the enclosure. OVERVIEW OF PORT MULTIPLIER LOGIC XRS10L140 port multiplier is a multiplexer where one active host connection is multiplexed to multiple device connections. The XRS10L140 is an extensible design that can support up to 4 device connections and utilizes the full bandwidth of the host connection. XRS10L140 uses four bits, known as the PM Port field in all Serial ATA frame types, to route frames between the selected host and the appropriate device. PM ports 0 through 3 are valid device ports within the 4-output XRS10L140, while PM port 15 is designated for munication between the host and the XRS10L140 itself. For host-to-device transactions, the PM Port field is designated by the host in order to specify which device the frame is intended for. For device-to-host transactions, the XRS10L140 fills in the PM Port field with the port address of the device that is transmitting...