sPHENIX MAPS tracker discussion

[Ming Liu <ming AT bnl.gov>]

FYI,

Resend bounced email from Cameron about MVTX/sPHENIX GTM bit pattern.

 

Cameron – I added your BNL email to the mvtx mailing list.

 

Ming  

 

-- 

Ming Xiong Liu

P-25, MS H846                     TEL: 505-667-7125 

Physics Division                            631-344-7821(BNL)

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From: "Dean, Cameron" <cdean AT bnl.gov>
Date: Thursday, October 1, 2020 at 11:42 AM
To: "Mead, Joseph" <mead AT bnl.gov>
Cc: sPHENIX-MAPS-l <sphenix-maps-l-bounces AT lists.bnl.gov>
Subject: sPHENIX GTM bit pattern

 

Hi Joe,

The MVTX firmware team has been looking at the interface between the FELIX card and the GTM. We noticed that there is a mismatch between the bit pattern we found in the GTM documents and what is decoded in FELIX. Would it be possible to confirm what the 16-bit pattern sent for each GTM clock is?

I’ve attached some slides explaining this in a little more detail but, on our side, I see that the ‘End Data’ and ‘Mode Enable’ bits are in a different order.

Cheers,
Cameron

P.S.  The comparison of bits we see is:

	Bits from GTM	Bits set in FELIX
Mode bits / BCO	0-7	0-7
Beam Clock	8	8
LVL1 Accept	9	9
End Data	10-11	11-12
Mode Bit Enable	12	10
User Bits	13-15	13-15

 

Attachment: felix_gtm.pdf
Description: Adobe PDF document