SAS /SATA expander information self-adaption method and system
A self-adaptive system and self-adaptive technology, applied in the direction of input/output to record carrier, input/output process of data processing, instruments, etc., can solve the problems of different transmission path lengths, the signal quality cannot be guaranteed, etc. Data security, the effect of ensuring read and write performance
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[0047] Example 1. On a certain server, use a Broadcom Raid Expander card as a SAS / SATA expansion device, connect multiple storage hard disks in the downlink, and use the de-emphasis method to tune the SATA_Tx eye diagram. Generally, there are four control parameters in the expander chip , including Test pattern rates, Attenuation, Pre-cursor, Post-cursor, the functions of each parameter are as follows:
[0048] Test pattern rates: used to switch the transmission signal rate, generally 3Gb / s, 6Gb / s, 12Gb / s;
[0049] Attenuation: used to adjust the signal output amplitude;
[0050] Pre-cursor and Post-cursor: Both are de-emphasis taps, "post" refers to the de-emphasis after the data "0"->"1" or "1"->"0" jumps, "pre" It refers to the de-emphasis before the data "0"->"1" or "1"->"0" jumps;
[0051] Before the adjustment, the oscilloscope shows that the eye height of the left part of the eye diagram is small, and the eye height is generally low. When Y2 and Y3 of the eye diagram ...
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