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[802.3AZ] Question Regarding Clause 24 .2.4.2 and 24.2.4.4

Hi,
I have one question regarding Transmit and Receive state machine for Clause 24.
As per Figure 24-8 - Transmit State Diagram , once device enters in TX_SLEEP from IDLE , it should transmit SLEEP code groups (tx_bits[4:0]= 5'b0000).
As per Figure 24-11a - Receive State Diagram , receiver can enter in RX_SLEEP from IDENTIFY_JK if it receives (/I/P) .

As Transmitter enters in TX_SLEEP directly from IDLE and will start sending SLEEP code groups, while receiver is expecting (/I/J) as receiver can  go to RX_SLEEP from IDENTIFY_JK or BAD_SSD state only i.e. before receiver transit it's state to RX_SLEEP , it must  have received /I/J/ pattern, but as Transmitter in TX_SLEEP state is sending SLEEP code groups, receiver will never receive /I/J/ so in this case receiver can only enter in RX_SLEEP through BAD_SSD state, as condition from transition to RX_SLEEP from BAD_SSD is rx_bits[9:0] = /P/P.

So my question is - what is the correct flow of normal state transition for receiver -
IDLE -> CARRIER_DETECT -> IDENTIFY_JK -> RX_SLEEP  or
IDLE -> CARRIER_DETECT -> BAD_SSD -> RX_SLEEP ?

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Regards,

Nishith Shukla
Sr ASIC Verification Engineer - ASIC Division
eInfochips Inc
www.einfochips.com


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