pga370 ETC-unknow, pga370 Datasheet - Page 51

• Manufacturer Part Number: pga370
• Description: Mpu Pentium Iii 64-bit 0.18um 700mhz 370-pin Fcpga
• Manufacturer: ETC-unknow

3.3.6
Datasheet
Table 25. 100 MHz AGTL+ / AGTL Signal Group Overshoot/Undershoot Tolerance at
Determining if a System Meets the Overshoot/Undershoot
Specifications
The overshoot/undershoot specifications listed in the following tables specify the allowable
overshoot/undershoot for a single overshoot/undershoot event. However most systems will have
multiple overshoot and/or undershoot events that each have their own set of parameters (duration,
AF and magnitude). While each overshoot on its own may meet the overshoot specification, when
you add the total impact of all overshoot events, the system may fail. A guideline to ensure a
system passes the overshoot and undershoot specifications is shown below. It is important to meet
these guidelines; otherwise, contact your Intel field representative.
The following notes apply to
NOTES:
Processor Pins
NOTES:
1. Overshoot/Undershoot Magnitude = 2.18 V is an Absolute value and should never be exceeded
2. Overshoot is measured relative to V
3. Undershoot is measured relative to V
4. Overshoot/Undershoot Pulse Duration is measured relative to 1.635 V.
5. Ringbacks below V
6. Leser Undershoot does not allocate longer or larger Overshoot
7. OEM's are encouraged to follow Intel provided layout guidelines. Consult the layout guidelines
8. All values specified by design characterization
1. BCLK period is 10 ns.
2. Measurements taken at the processor socket pins on the solder-side of the motherboard.
1. Insure no signal (CMOS or AGTL+/AGTL) ever exceed the 1.635 V
2. If only one overshoot/undershoot event magnitude occurs, ensure it meets the over/undershoot
3. If multiple overshoots and/or multiple undershoots occur, measure the worst case pulse
provided in the specific platform design guide.
Undershoot
Overshoot/
Magnitude
OR
specifications in the following tables
OR
duration for each magnitude and compare the results against the AF = 1 specifications. If all of
these worst case overshoot or undershoot events meet the specifications (measured time <
specifications) in the table (where AF=1), then the system passes.
2.18 V
2.13 V
2.08 V
2.03 V
1.98 V
1.93 V
1.88 V
Pentium
1,2
Maximum Pulse Duration at Tj = 80 °C
AF = 0.01
TT
20
20
20
20
20
20
20
can not be subtracted from Overshoots/Undershoots
®
III Processor for the PGA370 Socket at 500 MHz to 1.13 GHz
Table 25
AF = 0.1
2.53
4.93
16.6
(ns)
9.1
20
20
20
through
SS
TT
.
Table
AF = 1
0.25
0.49
0.91
1.67
3.0
5.5
10
27.
Maximum Pulse Duration at Tj = 85 °C
AF = 0.01
18.6
20
20
20
20
20
20
AF = 0.1
1.86
(ns)
11.4
3.2
6.1
20
20
20
AF = 1
0.18
0.32
0.6
1.1
6.6
20
2
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