Serial-Ata Host Connectors; Mgt Clocking Circuitry - Xilinx ML405 User Manual

Chapter 1: ML405 Evaluation Platform

36. Serial-ATA Host Connectors

Serial-ATA (SATA) is the next generation of the ATA interface used for storage devices
such as hard disks. The board contains two SATA host connectors that can be connected to
a SATA device (such as a hard disk) using a standard SATA cable. The SATA connectors are
connected to MGTs on the FPGA
Table 1-17: SATA Connection Configuration
SATA can also be used as a convenient and low cost medium for connecting MGTs. The
SATA physical interface can carry MGT signals up to 1.5 Gb/s for general-purpose usage.
The board ships with a special Xilinx SATA crossover cable that is used as a loopback
connection between the two SATA host connectors for:
•
•
The SATA crossover cable can also be used to connect MGTs between two boards.
Note:
(that is, PC to hard disk). It is only intended for host-to-host loopback connections.

37. MGT Clocking Circuitry

Overview
Low jitter LVDS clock sources on the board provide high-quality reference clocks for the
MGTs. Different clock sources are provided to support each of the MGT interfaces on the
board.
Table 1-18: MGT CLock Sources
Notes:
1. All non-RoHS-compliant boards use a 125-MHz clock. See
30
SATA Connector
SATA Host 1 Connector (J39)
SATA Host 2 Connector (J40)
Loopback testing
Bit error rate testing (BERT)
The special SATA crossover cable cannot be used to connect a SATA host to a SATA device
Table 1-18 provides a summary of the MGT clock sources.
Clock Source
SFP/SMA MGT
SATA MGT
SGMII/Loopback MGT
www.xilinx.com
(Table 1-17).
FPGA Connection
MGT 113B
MGT 113A
Frequency MGT Clock Input
Variable MGT 102 Clock
75 or 150 MHz MGT 113 Clock
(1)
250 MHz MGT 105 Clock
FPGA Differential Pair Pin
Positive
F26
K1
AF21
Appendix A, "Board Revisions"
ML405 Evaluation Platform
UG210 (v1.5.1) March 10, 2008
R
Negative
G26
L1
AF20
for details.