Wilder Technologies SATA 2.5 Test Adapter Dokumentacja Pobierz pdf (Strona 52)

Agilent Technologies, Inc.

Agilent Technologies, Inc. 52 SATA PHY, TSG & OOB Test MOI v.1.1 Revision 1.4

Test OOB-05 – COMWAKE Transmit Gap Length

Purpose: To verify that the COMWAKE Transmit Gap Length of the Product Under Test’s (PUT’s) transmitter is

within the conformance limits.

References:

[1] Serial ATA Revision 3.0, 7.2.1, Table 34 – OOB Specifications

[2] Ibid, 7.2.2.6.6

[3] Ibid, 7.4.25

[4] SATA Interoperability Program Unified Test Document, 2.18.5 – COMWAKE Transmit Gap Length

Resource Requirements:

Same as for OOB-02.

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

Discussion:

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

includes conformance limits for the COMWAKE Transmit Gap Length. Reference [2] provides the definition of

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

Test Setup:

The OOB Tests are designed to be run concurrently for simplicity. Since the initiation of a COMRESET

from a products or pattern generator will force a hard reset in a products, the following OOB tests can all be

performed using an Agilent 81134A 3.35Gbps Programmable Pulse/Pattern Generator to generate the

nominal OOB COMRESET and COMWAKE bursts, as well as to stress the min in-spec, max in-spec, min

out-of-spec and max out-of-spec timing conditions for inter-burst gaps. The Agilent oscilloscope, which is

running the N5411B SATA test software, will control both the pattern generator stimulus as well as the

oscilloscope acquisition and processing parameters, providing fully automated control and repeatability of

the OOB test sequence in successive fashion. A COMRESET is issued from the generator prior to running

each test to ensure products reset, but in some cases, it may still be necessary to remove power from the

products under test temporarily to allow the products to exit from a BIST controlled mode and return to

normal operation.

Test Procedure:

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

revision 1.02 or later. Either “PASS” or “FAIL” is shown for the products COMWAKE Transmit Gap

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

Observable Results:

The COMWAKE Transmit Gap Length value shall be between the minimum and maximum values of

OOB

multiplied by 160. Numerically, the COMWAKE gap lengths should be between 103.5 ns and 109.9

ns, which is 160 times the Min and Max UI

OOB

specification limits of 646.67ps and 686.67ps, respectively.

Note that this measurement is made as the longest burst length between the +100mV threshold crossing and

-100mV threshold crossing within each COMRESET/COMINIT/COMWAKE burst.

Possible Problems:

If this measurement is only made at the +100mV or -100mV threshold, some bits in the OOB burst will not

be measured correctly and may result in a measurement failure.

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