Wilder Technologies SATA 2.5 Test Adapter Dokumentacja Pobierz pdf (Strona 23)

Agilent Technologies, Inc.

Agilent Technologies, Inc. 23 SATA PHY, TSG & OOB Test MOI v.1.1 Revision 1.4

Test TSG-03 - Differential Skew

Purpose: To verify that the Differential Skew 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 31 – Transmitted Signal Requirements

[2] Ibid, 7.2.2.2.10 – TX Differential Skew (Gen2i, Gen1x, Gen2x)

[3] Ibid, 7.4.15 – Intra-pair Skew

[4] SATA Interoperability Program Unified Test Document, 2.15.3 – Differential Skew

[5] Pre-Test MOI

Resource Requirements:

Same as for TSG-01.

See appendix A for details.

Last Template Modification: May 7, 2006 (Version 1.02)

Discussion:

Reference [1] specifies the Transmitted Signal conformance limits for SATA products. This specification

includes conformance limits for Differential Skew. Reference [2] provides the definition of this term for

the purposes of SATA testing. Reference [3] defines the measurement requirements for this test.

Skew is measured with HFTP and MFTP. This test is only run once at the maximum interface rate of the

product (1.5Gbps or 3.0Gbps).

The cables connecting the Wilder Technologies SATA Gen3 Receptacle Adapter SATA-TPA-R or ICT-

Lanto SATA Receptacle Gen 3 TF-1R31 or Crescent Heart Software TF-SATA-NE/ZP or TF-eSATA-

NE/ZP test adapter or equivalent to the scope must be deskewed, as discussed in Appendix A.

Uncompensated cable skew contributes directly to measured differential skew.

Test Setup:

1. The N5411B SATA compliance software will prompt for HFTP and MFTP when it needs those patterns.

When prompted follow the procedures in reference [5] to enable those BIST-TAS patterns. Or keep

products in BIST-L.

2. Plug the test fixture to products. The test fixture is connected to channels 1 and 3 of the scope by two 36”

SMA cables (Rosenberger or equivalent). OBSERVE the signal on the scope. If it is the correct pattern,

press OK in the N5411B prompt. If not, the products did not properly handle BIST Activate FIS; a non-

standard way to make it produce the desired pattern will be required.

Test Procedure:

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

revision 1.02 or later. This requires measuring the mean skew of TX+ rise mid-point to the TX- fall mid-

point and the mean skew of TX+ fall mid-point to TX- rise mid-point, and finally computing the

Differential Skew = average of the magnitude (absolute value) of the two mean skews. This removes the

effect of rise-fall imbalance from the skew measurement. Two differential skew values are provided, one

for HFTP and one for MFTP, and both must meet the Max Diff Skew requirements in reference [1], which

are repeated in the table below for convenience. Either “PASS” or “FAIL” is shown for the differential

skew test in the report generated at the completion of the testing.

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 86 87

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Wilder Technologies SATA 2.5 Test Adapter Dokumentacja Strona 23