Intel 6300ESB ICH, Design Manual

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January 2007 193
Intel
®
855GME Chipset and Intel
®
6300ESB ICH Embedded Platform Design Guide
Intel
®
6300ESB Design Guidelines
9.1.1.6 SATALED# Implementation
The 6300ESB provides a signal (SATALED#) to indicate SATA device activity. In order for this
signal to work in conjunction with Parallel ATA hard drives, Intel recommends implementing the
glue logic shown in
Figure 94 .
This signal is open-drain and requires an weak external pull-up to Vcc3.3. When low, SATALED#
indicates SATA device activity and should activate the hard drive LED. When tri-stated, the signal
will not activate the LED.
Note: Ensure that all connectors and cables comply with the SATA Gold Specification, Revision 1.0, dated
August 29, 2001 or later.
Figure 93. SATA BIAS Connections
Table 73. SATA BIAS Routing Summary
Trace Impedance SATARBIASP/SATARBIASN Routing Requirements Maximum Trace Length
55
Ω
± 10% 5 mil width, 5 mil spacing 500 mils
Figure 94. SATALED# Circuitry Example
From Primary and
Secondary IDE Connectors
SATALED#
Hard Drive LED
Vcc3_3
Vcc3_3
Vcc3_3
Glue Logic