Specifications

SATA-IO Confidential 67
2.17.5. OOB-05 : COMWAKE Transmit Gap Length
2.17.5.1. Device/Host Expected Behavior
See section 7.2.2.7.5 of Serial ATA Revision 2.6.
• See section 7.4.21 of Serial ATA Revision 2.6.
Measurement Requirements
• This test is only run once at the maximum interface rate of the product
• Note that the requirement within the specification is called out in UI. For the interests of the Interoperability
Program, the measured value (T) will be compared against the minimum and maximum values of a multiple of
UI
OOB
in nanoseconds, where 103.5 ≤ T ≤ 109.9. The values above are obtained from the following formulas:
(1.5Gb/s or 3Gb/s).
o Min (160) = 646.67ps (Min UIoob) x 160 = 103.5ns
o Max (160) = 686.67ps (Max UIoob) x 160 = 109.9ns
• Gap Length measured to be between minimum and maximum values of UI
OOB
multiplied by 160 (in
nanoseconds)
Pass/Fail Criteria
2.17.6. OOB-06 : COMWAKE Gap Detection Windows
2.17.6.1. Device/Host Expected Behavior
See section 7.2.2.7.6 of Serial ATA Revision 2.6.
See section 7.4.21 of Serial ATA Revision 2.6.
Measurement Requirements
This test is only run once at the maximum interface rate of the product (1.5Gb/s or 3Gb/s).
Note that the specification stipulates a Detection Window with value of T, where T is 35 ≤ T < 175 in nanoseconds.
For the interests of the Interoperability Program, the measurements will only be taken to verify this requirement at the
lower and upper limits.
To execute this test, a COMWAKE is issued to the product at the following limits:
• 155UI
OOB
(at this limit, the product is expected to respond with COMWAKE)
• 165UI
OOB
(at this limit, the product is expected to respond with COMWAKE)
• 45UI
OOB
(at this limit, the product is expected to NOT respond with COMWAKE)
• 266UI
OOB
(at this limit, the product is expected to NOT respond with COMWAKE)
NOTE : There is no timing requirement for how soon following a host COMWAKE which the device must respond with
a device COMWAKE, and vice versa. For test efficiency purposes, a tester is only required to wait for verification of
device COMWAKE up to 100ms following de-qualification of host COMWAKE, and vice versa.
Suggested test methodology requires sending the following test sequence continuously from a suitable generator:
6 x (COMINIT/COMRESET burst + 480UI
OOB
gap) +
1 x (45,000UI
OOB
gap) +
6 x (COMWAKE burst + 160UI
OOB
gap) +
1 x (130,000UI
OOB
gap)
1) Using a suitable instrument (e.g. real-time scope or equivalent) to observe a minimum continuous 2ms
window, verify that the PUT consistently responds to each OOB sequence by entering speed negotiation
accordingly. Figure 2 below shows an example screen capture of typical PUT behavior for nominal
COMINIT/COMRESET and COMWAKE gaps: