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Re: [EFM] 22.2.4.1.12 Unidirectional enable



Title:
Thanks Ben.
 
But just for clarity, what does ignoring bit 0.5 mean? does it mean assume it is zero even if it is one?
 
Thanks,
Shahram
-----Original Message-----
From: Benjamin Brown [mailto:benjbrown@comcast.net]
Sent: Thursday, March 25, 2004 9:48 PM
To: Shahram Davari
Cc: STDS-802-3-EFM@listserv.ieee.org
Subject: Re: [EFM] 22.2.4.1.12 Unidirectional enable


Shahram,

Thanks for your thoughts on this text. This text has been wordsmithed for
the last 18 months and 8 drafts. The suggestions you make are not bad ones,
but I don't think you've pointed out anything technically wrong with the text.

Further, from a procedural standpoint, this portion of the text was not changed
in the most recent draft and therefore is considered to be outside the scope of
new comments. While you are free to submit this comment if you wish, assuming
you are a member of the sponsor ballot group, expect that it will likely be rejected
due to the reasons described above.

Regards,
Ben Brown
(Clause 22 editor)

Shahram Davari wrote:
Hi,
 
1) The first paragraph of this section has some understandability issue:
 
"If a PHY reports via bit 1.7 that it lacks the ability to encode and transmit data from the media independent interface regardless of whether the PHY has determined that a valid link has been established, the PHY shall return a value of zero in bit 0.5, and any attempt to write a one to bit 0.5 shall be ignored."
 
My suggestion is to change it to:
 
"If a PHY reports via bit 1.7 that it lacks the ability to encode and transmit data from the media independent interface when the PHY has not determined that a valid link has been established, the PHY shall return a value of zero in bit 0.5, and any attempt to write a one to bit 0.5 shall be ignored."
 
2) The second paragraph says:
 
"If bit 0.5 is set to a logic zero, bit 0.12 to logic one or bit 0.8 to logic zero, encoding and transmitting data from the media independent interface shall be dependent on whether the PHY has determined that a valid link has been established. When bit 0.12 is one or bit 0.8 is zero, bit 0.5 shall be ignored."
 
There are two questions here:
 
a) What does ignore mean? does it mean whatever 0.5 value is, it would be considered to be zero?
b) The second sentence of this quote contradicts the first sentence. Because both of them are talking about a condition in which 0.12 is set to 1 or 0.8 is zero, but the latter sentence says 0.5 should be ignored while the former sentence says
if 0.5 is zero, it means no unidirectional support.
 
Suggestion is to delete the first sentence.
 
Yours,
Shahram

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