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SEMI G80-0200 © SE MI 2000 26 Driv e to Comp are Ed ge Error -200ps +200ps Compa re Error MIN Value- M IN is th e value all compa rators a re pr ogrammed t o when the first d rive edge is d etect ed. For a swe ep - Comp …

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SEMI G80-0200 © SEMI 200025
Drive to Compare Edge Error
Compare Error
MIN Value- MIN is the value
all comparators are
programmed to when the first
drive edge is detected.
For a sweep- Compare edges
should be programmed far in
advance of the reference signal
allowing enough room to detect
the earliest occurrence of a drive
edge.
TIMING RELATIONSHIPS, DEFINITIONS & EXAMPLE RESULTS
DEFINITIONS-
Reference- The programmed value of the drivers
Drive to Compare Error- The difference between the average of min & max for Drive and the
average of min & max for Compare error.
RELATIONSHIPS & EXAMPLE RESULTS-
Negative Error: Reference - Min Value = 1000ps - 900ps = 100ps
Positive Error: Reference - Max Value = 1000ps - 1200ps = -200ps
Drive to Compare Error: Reference - [(Min Value + Max Value)/2] = 1000ps - [(900ps + 1200ps )/2] = -50ps
For a sweep- Compare edges
should be programmed far
beyond the reference signal
allowing enough room to detect
the latest occurrence of a drive
edge.
MAX drive value- Detect the
latest occurrence of the drive
edge with the earliest compare
edge (last fail- Timing Linearity
test 10.3.1)
MIN drive value- Detect the
earliest occurrence of the drive
edge with the latest compare edge
(first pass- Timing Linearity Test
10.3.1)
50ps
In this example:
Drive edge error = ±50ps
Compare edge error = ±100ps
Drive to Compare error = - 50ps
This example will illustrate how
numerical error values are obtained.
MAX value- MAX is the value
all comparators are programmed
to when the last drive edge is
detected.
1200ps
(Max Value)
NOTE: All drive edges are
detected in parallel in pairs: pin 1
& 2, 3 & 4,...n-1 & n.
NOTE: All drive edges are detected in
parallel in pairs: pin 1 & 2, 3 & 4,...n-1
& n.
900ps
950ps
1000ps Reference
50ps
First Pass
Min value
Last Fail
Max value
When the edges on all pins are
detected the drive to compare
error relationship will appear as
indicated here with associate
d
error values indicated.
-100ps
-100ps +100ps
900ps
(Min value)
Sweep
Compare Edges
-100ps +100ps
1000ps Drive
Reference
1000ps
Last fail
Sweep
+100ps-100ps
First pass
50ps
-50ps +50psDrive Error
Drive
Reference
-50ps +50psDrive Edges
-50ps +50psDrive Edges
1000ps Drive
Reference
-50ps +50ps
Drive
Reference
+100ps
0
n
s
1200ps
0
n
s
900ps
1200ps
Compare Edges
Figure A2-2
Level 1 Drive Edge Error << Compare Edge Error
SEMI G80-0200 © SEMI 2000 26
Drive to Compare Edge Error
-200ps +200ps
Compare Error
MIN Value- MIN is the value all
comparators are programmed to when
the first drive edge is detected.
For a sweep- Compare edges
should be programmed far in
advance of the reference signal
allowing enough room to detect
the earliest occurrence of a drive
edge.
TIMING RELATIONSHIPS, DEFINITIONS & EXAMPLE RESULTS
DEFINITIONS-
Reference- The programmed value of the drivers
Drive to Compare Error- The difference between the average of min & max for Drive and the average of min & max for Compare error.
RELATIONSHIPS & EXAMPLE RESULTS-
Negative Error: Reference - Min Value = 1000ps - 750ps = 250ps
Positive Error: Reference - Max Value = 1000ps - 1350ps = -350ps
Drive to Compare Error: Reference - [(Min Value + Max Value)/2] = 1000ps - [(750ps + 1350ps )/2] = -50ps
For a sweep- Compare edges
should be programmed far beyond
the reference signal allowing
enough room to detect the latest
occurrence of a drive edge.
MAX drive value- Detect the
latest occurrence of the drive
edge with the earliest compare
edge (last fail)
MIN drive value- Detect the earliest
occurrence of the drive edge with the
latest compare edge (first pass- Timing
Linearity Test 10.3.1)
50ps
-100ps +100ps
Drive Error
Drive
Reference
Drive Edges
-100ps
1000ps Drive
Reference
+100ps
In this example:
Drive edge error = ± 100ps
Compare edge error = ± 200ps
Drive to Compare error = - 50ps
This example will illustrate how
numerical error values are obtained.
Max Value- MAX is the value all
comparators are programmed to
when the last drive edge is
detected.
1350ps
(Max value)
Sweep
Compare Edges
NOTE: All drive edges are
detected in parallel in pairs: pin 1
& 2, 3 & 4,...n-1 & n.
NOTE: All drive edges are
detected in parallel in pairs: pin 1
& 2, 3 & 4,...n-1 & n.
When the edges on all pins are
detected the drive to compare error
relationship will appear as
indicated here with associated error
values indicated.
-200ps +200ps
Last fail
750ps
950ps
1000ps Reference
-100ps +100ps
50ps
Drive
Reference
First Pass
Min Value
Last Fail
Max Value
-200
p
s
+200ps
900ps 1000ps 1100ps
1350ps
750ps
(Min value)
Sweep
Compare Edges
-200
p
s
+200ps
First pass
-100ps
Drive Edges
1000ps Drive
Reference
+100ps
0ns
750ps
1350ps
0ns
Figure A2-3
Level 1 Compare Edge Error >> Drive Edge Error
SEMI G80-0200 © SEMI 200027
Drive to Compare Edge Error
Compare Error
MIN Value- MIN is the value
all comparators are
programmed to when the first
drive edge is detected.
For a sweep- Compare edges
should be programmed far in
advance of the reference signal
allowing enough room to detect
the earliest occurrence of a drive
edge.
TIMING RELATIONSHIPS, DEFINITIONS & EXAMPLE RESULTS
DEFINITIONS-
Reference- The programmed value of the drivers
Drive to Compare Error- The difference between the average of min & max for Drive and the
average of min & max for Compare error.
RELATIONSHIPS & EXAMPLE RESULTS-
Negative Error: Reference - Min Value = 1000ps - 750ps = 250ps
Positive Error: Reference - Max Value = 1000ps - 1350ps = -350ps
Drive to Compare Error: Reference - [(Min Value + Max Value)/2] = 1000ps - [(750ps + 1350ps )/2] = -50ps
For a sweep- Compare edges
should be programmed fa
r
b
eyond the reference signal
allowing enough room to
detect the latest occurrence
of a drive edge.
MAX drive value- Detect the
latest occurrence of the drive
edge with the earliest compare
edge (last fail- Timing Linearity
Test 10.2.1)
MIN drive value- Detect the earliest
occurrence of the drive edge with the
latest compare edge (first pass- Timing
Linearity Test 10.3.1)
50ps
In this example:
Drive edge error = ±200ps
Compare edge error = ±100ps
Drive to Compare error = - 50ps
This example will illustrate how
numerical error values are obtained.
MAX Value- MAX is the value
all comparators are programmed
to when the last drive edge is
detected.
1350ps
(Max Value)
750ps
(Min value)
Sweep
Compare Edges
N
OTE: All drive edges are
detected in parallel in pairs:
pin 1 & 2, 3 & 4,...n-1 & n.
N
OTE: All drive edges are
detected in parallel in pairs: pin 1
& 2, 3 & 4,...n-1 & n.
850ps
1050ps
950ps
1000ps Reference
50ps
750ps
First Pass
Min value
Last Fail
Max value
When the edges on all pins are
detected the drive to compare
error relationship will appear as
indicated here with associated
error values indicated.
-100ps +100ps
-100
p
s
+100ps
-100ps +100ps
-200ps
Drive Edges
1000ps Drive
Reference
+200ps
-200ps
Drive Edges
1000ps Drive
Reference
+200ps
-200ps +200ps
1000ps
1350ps
800ps
-200ps
+200ps
Drive Error
Drive
Reference
Last fail
Sweep
+100ps-100ps
First pass
0
n
s
750ps
0ns
12000ps
Drive
Reference
Compare Edges
1350ps
Figure A2-4
Drive Edge Error >> Compare Edge Error