Re: [802.3_100GCU] EEE question of 802.3bj D3.0

["Hugh Barrass (hbarrass)" <hbarrass@xxxxxxxxx>]

Chih-Ching Yu,

 

I can see your point. I wanted to simplify the definition to include only 2 signals (for QUIET and ALERT) – however, the scrambled data does not allow a fast detection circuit to react quickly to an alert, therefore there is justification for 3 distinct signals. I amended my comment to preserve the 3 signals (square wave & 2 x scrambled pattern), but I think that the text should be made more clear so that this confusion is removed.

 

Thanks for your help improving this draft.

 

Hugh.

 

From: CC Yu (游志青) [mailto:cc.yu@xxxxxxxxxxxx]
Sent: Wednesday, December 18, 2013 9:13 PM
To: Hugh Barrass (hbarrass); STDS-802-3-100GCU@xxxxxxxxxxxxxxxxx
Subject: RE: [802.3_100GCU] EEE question of 802.3bj D3.0

 

Hi Hugh,

 

Thanks for your kindly help.

 

In your reply, the ALERT pattern will be generated only as the defined in 83.5.11.1.  And the old ALERT signal(0xFF00) will be replaced.

But if we want to shorten the EEE wake up time, the signal(0xFF00) seems better than the defined in 83.5.11.1.

 

Best Regards,
--------------------------------------------------------------------------------------------
Chih-Ching Yu 游志青
Architecture Development Div. 架構開發處
Data Center Networking BU. 數據中心網路事業部

MediaTek Inc.
TEL:+886-3-5670766 Ext:26682
E-mail:CC.Yu@xxxxxxxxxxxx

 

From: Hugh Barrass (hbarrass) [mailto:hbarrass@xxxxxxxxx]
Sent: Monday, December 16, 2013 10:39 AM
To: CC Yu (游志青); STDS-802-3-100GCU@xxxxxxxxxxxxxxxxx
Cc: Hugh Barrass (hbarrass)
Subject: RE: [802.3_100GCU] EEE question of 802.3bj D3.0

 

Chih-Ching Yu,

 

I apologize for the delay in responding.

 

I believe that you have highlighted a mistake in the draft specification. As this is currently under Sponsor Ballot review, I will submit a comment to fix the mistake. In particular:

 

Annex 83A.3.2a contradicts Clause 83.5.11.1 – I think that Annex 83.3.2a,^, 2^nd paragraph should change:

 

 

If the EEE capability includes XLAUI/CAUI shutdown (see 78.5.2) then when aui_tx_mode (see 83.5.11) is ALERT, the transmit direction sublayer sends a repeating pattern, as defined in 83.5.11.1 which is transmitted across the XLAUI/CAUI. When aui_tx_mode is QUIET, the transmit direction XLAUI/CAUI transmitter sends a repeating pattern, as defined in 83.5.11.1, and then is disabled as specified in 83A.3.3.1.1. Similarly when the received aui_tx_mode is set to ALERT, the receive direction sublayer sends a repeating pattern, as defined in 83.5.11.1  which is transmitted across the XLAUI/CAUI. When the received aui_tx_mode is QUIET, the receive direction XLAUI/CAUI transmitter sends a repeating pattern, as defined in 83.5.11.1, and then is disabled as specified in 83A.3.3.1.1.

 

 

Similarly, Clauses 84 and 85 need to be changed to remove some confusion. Change Clause 84.2 and Clause 85.2, second paragraph to:

 

 

The tx_mode parameter takes on one of up to six values: DATA, SLEEP, QUIET, FW, ALERT or BYPASS. When tx_mode = QUIET, transmission is disabled. Note: if Clause 74 FEC or a physical instance of XLAUI/CAUI is in use, only the values DATA, QUIET and ALERT may be passed through to the PMD (see 74.5.1.7, 83.5.11).

 

 

Also change Clause 84.7.2 and Clause 85.7.2 to:

 

 

If the optional Energy Efficient Ethernet (EEE) capability with the deep sleep mode option is supported (see Clause 78) then when tx_mode  is ALERT, the transmitter equalizer taps shall be set to the preset state specified in 72.6.10.2.3.1. When tx_mode is QUIET, the transmitter shall be disabled as specified in 84.7.6. For all other states of tx_mode, the driver coefficients are restored to their states resolved during training.

 

 

I hope that resolves your difficulty. I will submit comments against the draft to make those changes.

 

With regards,

 

Hugh.

 

 

From: CC Yu (游志青) [mailto:cc.yu@xxxxxxxxxxxx]
Sent: Wednesday, December 04, 2013 8:48 PM
To: STDS-802-3-100GCU@xxxxxxxxxxxxxxxxx
Subject: [802.3_100GCU] EEE question of 802.3bj D3.0

 

Colleagues,

 

I have EEE questions of 802.3bj D3.0 as following.

 

As the following figure(new plotted),

Question1:Does alert/quiet signal follow Figure 83-7/83-8(in 802.3bj D3.0) in XLAUI(point A,B)?

   Does ALERT pattern replace repeating 16-bit pattern with Figure 83-7 method?

 

Question2:Does alert/quiet signal follow Figure 83-7/83-8(in 802.3bj D3.0) in 40GBASE-CR4(point E,F)?

I found following two descriptions(a)(b) in 802.3bj D3.0.

(a)PMD 85.7.2

–        If the optional Energy Efficient Ethernet (EEE) capability with the deep sleep mode option is supported (see Clause 78) then when tx_mode is set to ALERT, the adjacent PMA sends a repeating 16-bit pattern, hexadecimal 0xFF00, to the PMD, which the PMD transmits.

(b)PMA 83.5.11.3

–        When the value of tx_mode is ALERT, the PMA inserts the PMA alert signal defined in 83.5.11.1.

      The description(a) seems that ALERT pattern is repeating 16bit pattern.

But description(b) seems that ALERT pattern is generated from Figure 83-7.

I am confused about these two descriptions.

 

Thanks for your kindly help.

 

 

 

Best Regards,
--------------------------------------------------------------------------------------------
Chih-Ching Yu 游志青
Architecture Development Div. 架構開發處
Data Center Networking BU. 數據中心網路事業部

MediaTek Inc.
TEL:+886-3-5670766 Ext:26682
E-mail:CC.Yu@xxxxxxxxxxxx