Wilder Technologies SATA 2.5 Test Adapter Especificaciones descargar pdf (Pagina 16)

Agilent Technologies, Inc.

Agilent Technologies, Inc. 16 SATA PHY, TSG & OOB Test MOI v.1.1 Revision 1.4

Test PHY-04 - Spread-Spectrum Modulation Deviation

Purpose: To verify that the Spread-Spectrum Modulation Deviation of the Products Under Test’s (PUT’s)

transmitter is within the conformance limits.

References:

[1] Serial ATA Revision 3.0, 7.2.1, Table 29 – General Specifications

[2] Ibid, 7.2.2.1.6 and 7.3.3 – Spread-Spectrum Modulation Deviation

[3] Ibid, 7.4.14 – SSC Profile

[4] SATA Interoperability Program Unified Test Document, 2.13.4 – Spread-Spectrum Modulation

Deviation

[5] Pre-Test MOI

Resource Requirements:

Same requirements as for PHY-01

Last Template Modification: March 25, 2009 (Version 1.02)

Discussion:

Reference [1] specifies the general PHY conformance limits for SATA products. This specification

includes conformance limits for the Spread-Spectrum Modulation Deviation. Reference [2] provides the

definition of this term for the purposes of SATA testing. Reference [3] defines the measurement

requirements for this test.

In this test, the Spread-Spectrum Modulation Deviation is measured, based on at least 10 complete SSC

cycles.

This test is only run once at the maximum interace rate of the product (1.5Gb/s, 3.0Gb/s or 6.0Gb/s)

Test Setup:

Same setup as for PHY-01.

Test Procedure:

This parameter is covered by Agilent Technologies, Inc. N5411B automated SATA compliance software,

revision 1.02 or later. The Max Unit Interval is measured over the entire trend and converted to ppm

deviation. The Min Unit Interval is measured over the entire trend and converted to ppm. Both Max and

Min UI must be within the limits of the specification to pass this test. Either “PASS” or “FAIL” is shown

for the SSC modulation deviation test in the report generated at the completion of the testing.

The measurement for SSC modulation deviation records the mean of max unit interval values after the

1.98MHz filter is applied. The value reported as the result must be the single total range value relative to

nominal of the SSC modulation deviation, using the equations below, where “Min” is the mean of 10

recorded values of the minimum peaks and “Max: is the mean of 10 recorded values of the maximum

peaks. The ppm deviation is computed from the following operations and compared against spec value for

pass/fail:

Calculate max deviation = (Measured Max – Nominal)/Nominal * 1e6 ppm

Calculate min deviation = (Measured Min – Nominal)/Nominal * 1e6 ppm

Nominal is defined as 666.6667ps for Gen 1 MAX data rate products, 333.3333ps for Gen 2 MAX data rate

products and 166.6667ps for Gen3 MAX data rate products.

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