Agilent Technologies, Inc.
Agilent Technologies, Inc. 50 SATA PHY, TSG & OOB Test MOI v.1.1 Revision 1.4
Test OOB-04 – COMINIT/RESET Transmit Gap Length
Purpose: To verify that the COMINIT/RESET 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, 7.2.2.6.5
[3] Ibid, 7.4.25
[4] SATA Interoperability Program Unified Test Document, 2.17.4 – COMINIT/RESET 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 COMINIT/RESET 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 COMINIT/RESET Transmit
Gap Length test in the report generated at the completion of the testing.
Observable Results:
The COMINIT/RESET Transmit Gap Length value shall be between the minimum and maximum values of
UI
OOB
multiplied by 480. Numerically, the COMINIT and COMRESET gap lengths should be between
310.4 ns and 329.6 ns, which is 480 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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