AnsweredHot!KSZ9897RTXI - LED's not blinking in Single-LED Mode

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zatim
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2018/07/23 01:40:02 (permalink)
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KSZ9897RTXI - LED's not blinking in Single-LED Mode

Hi!
I have a problem with KSZ9897RTXI - LED's not blinking in Single-LED Mode. Single LED,s connected beetween LEDx_1 (cathode) and LEDx_0 (anode) pins with 47 Ohm resistor (current less then 5 mA).
 
Mode is switching to Single-LED Mode - LEDx_1 becomes low for all speed, but LEDx_0 don't toggle when activity. In Tri-Color Dual-LED Mode everything works correctly (on 1000M speed only).
 
Who faced such a problem? What am I doing wrong?
 
Thanks
zt
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tshelton
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Re: KSZ9897RTXI - LED's not blinking in Single-LED Mode 2018/08/30 07:11:59 (permalink) ☼ Best Answerby zatim 2018/09/24 23:43:00
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I am observing the same behavior with the KSX9896C.
 
Has anyone found a solution for this?
 
Thanks,
 
Todd
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zatim
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Re: KSZ9897RTXI - LED's not blinking in Single-LED Mode 2018/09/24 23:47:54 (permalink)
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In my opinion, this is a hardware problem. We can only wait for Microchip engineers to notice this problem and correct in the next revision of the chip.
 
zt
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qhb
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Re: KSZ9897RTXI - LED's not blinking in Single-LED Mode 2018/09/24 23:50:10 (permalink)
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Did you lodge a Support Ticket?
http://www.microchip.com/support
 

Worst forum problems are now fixed, but the damn firewall is still there.
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tshelton
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Re: KSZ9897RTXI - LED's not blinking in Single-LED Mode 2018/09/27 07:15:57 (permalink) ☄ Helpfulby Jim Nickerson 2018/09/27 07:30:15
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I submitted a ticket and finally received a response.
 
A new errata was released for the KSX9896C about a month ago.
 
http://ww1.microchip.com/downloads/en/DeviceDoc/80000757C.pdf.
 
Module 14: LEDx_0 in Single-LED Mode does not indicate link activity DESCRIPTION The PHY Port LEDx_0 does not go low in the presence of link activity when in Single-LED Mode. END USER IMPLICATIONS Link activity cannot be determined in Single-LED Mode. However, LEDx_1 will indicate if the link is up or down. The lack of status lends to uncertainty that traffic is passing through the port. Work around No work around exists for Single-LED Mode. Both PHY port LEDs work properly in Tri-Color Dual-LED Mode, which is the default LED mode. PLAN This erratum will not be corrected in a future revision.
 
Sounds like it now a known issue, and they don't plan to fix it, so I am assuming he same is the case for the KSZ9897RTXI.
 
 
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