Specifications

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test is FAIL.
b) Verify that the H-PM interface running at reduced speed resumes at the reduced speed.
If the interface speed before and after a power management sequence is the 1.5 Gb/s, the result is PASS. If
the H-PM interface did not enter a low power state when requested or resumed at a different speed, then the
result is FAIL. There is no N/A result for this test step.
If all 10 results are PASS, then the test result is PASS. If there is a single FAIL result, then the result for this
test is FAIL.
2.18.10. PM-10 : Speed matching upon resume (PM-Dev interface)
2.18.10.1. Expected Behavior
See section 8.4.3.2 of Serial ATA Revision 2.6.
The quoted statement below refers to the situation in which a port has received COMWAKE after entering partial or
slumber state:
“Calibration and speed negotiation is bypassed since it has already been performed at power-on and system
performance depends on quick resume latency. The device, therefore, shall transmit ALIGN
P primitives at the speed
determined at power-on.”
Measurement Requirements
a) Verify that the PM-Dev interface running at default speed resumes at the default speed.
Check that the port multiplier supports interface power management using the steps in PM-05.
Attach an HDD supporting HIPM to a device port on the PM. Initialize the selected device port interface and
verify that the interface is active.
Record the current interface speed. Determination of the current interface speed is MOI specific. For
example, it may be obtained by reading the value in the SPD field of the device port SStatus register, or it
may be observed directly through a hardware interface monitoring device.
Issue PMREQ_P and confirm that the PM-DEV interface enters partial state. (Note: PMREQ_P can be
issued on the H-PM interface and be propagated by the PM to the PM-DEV interface, as described in PM-05,
or PMREQ_P can be issued directly by the PM if the test method has access to the device port registers of
the PM.)
Issue COMWAKE and wait for the PM-Dev interface to become active.
Record the current interface speed.
Repeat this test 10 times.
Issue PMREQ_S and confirm that the PM-DEV interface enters partial state. (Note: PMREQ_S can be
issued on the H-PM interface and be propagated by the PM to the PM-DEV interface, as described in PM-05,
or PMREQ_S can be issued directly by the PM if the test methodology permits access to the PM PSCRs.)
Issue COMWAKE and wait for the PM-Dev interface to become active.
Record the current interface speed.
Repeat this test 10 times.