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Clock Generator Specification for AMD64 Processors
24707 Rev. 3.08 September 2003
Table 15. Skew Characteristics
Parameter
Description
Test Conditions
Skew
5
Window
Unit
T
SK_CPU_CPU
Processor to processor skew,
time independent
Processor to PCI skew, time
independent
Measured at crossing points
for CPUT rising edges.
1
Measured at crossing point
for CPUT rising edge and
1.5V for PCI clocks
Measured between rising at
1.5V
Measured between rising at
1.5V
250
ps
T
SK_CPU_PCI33
500
(2000)
3
ps
T
SK_PCI33_PCI33
PCI33 to PCI33 clock skew,
time independent
PCI33 to HT66 clock skew,
time independent
500
ps
T
SK_PCI33_HT66
500
ps
T
SK_CPU_HT66
Processor to HT66 clock
skew, time independent
Measured at crossing point
for CPUT rising edge and
1.5 V for HyperTransport
clocks
Measured between rising
edge at 1.5V
500
(2000)
3
ps
T
T
SK_HT66_HT66
HT66 to HT66 clock skew,
time independent
500
ps
Notes:
1
.
All skews in this skew budget are measured from the first referenced signal to the next (i.e.,
Tsk_CPU_PCI33 is the skew from the processor crossing point to any PCI33 rising edge @ 1.5V).
Therefore, this skew specifies the maximum
skew window
between these two signals to be 500 ps
whether the processor crossing leads or lags the PCI clock. This should
not
be interpreted to mean
that the PCI33 edge could either be 500 ps before the processor clock to 500 ps after the clock, thus
defining a 1000 ps window in which the PCI33 clock edge could fall.
Time variant and time invariant skews will add in real systems such that the worst-case skew
allowable is the sum of the two. All skew measurements should be taken at output pins of the clock
generator with SSC on.
If the Clock Vendor is only interested in supporting AMD64 processor-based systems (i.e., the clock
generator will
not
be used in K7 systems), the T
SK CPU-PCI33
and T
SK CPU-HT66
Time
Independent
skews
(as measured under nominal temperature and voltage) can be increased from 500 ps to 2000 ps. This
does NOT mean the total combined skew over temp/voltage is equal to 2000 ps + 500 ps=2500 ps.
The
Time
Variant
skew of the clock generator must still remain <200 ps. The
Time Variant
skew
allows for skew changes induced by temperature and/or voltage variations.
The
Time
Variant specifications are derived from the HyperTransport Electrical Specification. The
Tclk2Rclkssc parameter can be ignored when the skew measurements are taken at the output of the
clock generator.
5
.
AMD recommends using an averaging function on the oscilloscope while taking skew measurements.
This technique has been shown to be effective in reducing jitter accumulation within the skew
measurements.
2
.
3.
4
.
38
Electrical Specifications
Chapter 7
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