Re: [ethmac] necessity of preamble during reception

["Karthik D " <karthikd@myw.ltindia.com>]

** Proprietary **
** High Priority **

"RX_DV (Receive Data Valid) is driven by the PHY to indicate that the PHY is presenting recovered and decoded nibbles on the RXD bundle and that the data on RXD is synchronous to RX_CLK. RX_DV shall transition synchronously with respect to the RX_CLK. RX_DV shall remain asserted continuously from the first recovered nibble of the frame through the final recovered nibble and shall be negated prior to the first RX_CLK that follows the final nibble. In order for a received frame to be correctly interpreted
by the Reconciliation sublayer and the MAC sublayer, RX_DV must encompass the frame, starting no later than the Start Frame Delimiter (SFD) and excluding any End-of-Frame delimiter"

This tells that we need to look for valid SFD rather than Preamble to receive the frame.

Hope i am correct...

Karthik D. 

>>> mkrishna@tataelxsi.co.in 12/06/02 05:45PM >>>
hi all,

I have simple doubt.During reception of a frame is it required that all
the preamble(i.e 6 octets) has to be received or is it suffucicient that
a valid SFD is received before the frame can be processed.

Thanks in advance
Mohan

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