Table of Contents
Advertisement
Table 24:
Ready LED Out conditions
Normal command activity
Format in progress, each cylinder change
The Ready LED Out signal is designed to pull down the cathode of an LED. The anode is attached to the
proper +3.3 volt supply through an appropriate current limiting resistor. The LED and the current limiting resis-
tor are external to the drive. See Table 25 for the output characteristics of the LED drive signals.
Table 25:
LED drive signal
State
LED off, high
LED on, low
9.5.2
Differential signals
The drive SAS differential signals comply with the intra-enclosure (internal connector) requirements of the SAS
standard.
Table 26 defines the general interface characteristics.
Table 26:
General interface characteristics
Characteristic
Bit rate (nominal)
Unit interval (UI)(nominal)
Impedance (nominal, differential )
Transmitter transients, maximum
Receiver transients, maximum
9.5.2.1
Eye masks
9.5.2.1.1
Eye masks overview
The eye masks are graphical representations of the voltage and time limits on the signal at the compliance
point. The time values between X1 and (1 - X1) cover all but 10
of the total jitter population has a range of ± 7 standard deviations.
Savvio 10K.2 SAS Product Manual, Rev. B
Test condition
≤
≤
0 V
VOH
3.6 V
I
= 15 mA
OL
LED status
Toggles on/off
Output voltage
-100 µA < I
< 100 µA
OH
≤
≤
0
V
0.225 V
OL
Units
1.5 Gbps
Mbaud
1,500
ps
666.6
ohm
100
± 1.2
V
± 1.2
V
-12
of the jitter population. The random content
3.0 Gbps
3,000
333.3
100
± 1.2
± 1.2
61
Advertisement
Table of Contents
