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luojifenxiyi
 Post subject: how to use a logic analyzer to determine the 8bit flash pin
PostPosted: February 14th, 2022, 14:07 
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Joined: February 14th, 2022, 13:29
Posts: 17
Location: finland
Ladies and gentlemen, I am a newbie.
I would like to ask, how to use a logic analyzer to determine the 8bit flash pin definition.
D0, D1, D2, D3, D4, D5, D6, D7
RE, R/B, CE, WE, ALE, CLE.
Is there any technical information, or video instructions,
thank you all.


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pepe
 Post subject: Re: how to use a logic analyzer to determine the 8bit flash
PostPosted: February 15th, 2022, 6:00 
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Joined: October 3rd, 2005, 0:40
Posts: 4756
Location: Hungary
you need to catch known commands like read ID and figure out the signals. Get yourself familiar with NAND flas docs and timing diagrams.
It's a good idea to analyze a known device first...

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fzabkar
 Post subject: Re: how to use a logic analyzer to determine the 8bit flash
PostPosted: February 15th, 2022, 15:19 
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Joined: September 8th, 2009, 18:21
Posts: 16997
Location: Australia
I have zero experience in this area, but I would think that static resistance measurements would be useful.

For example, D0 - 7 would probably have very similar resistances to ground and Vcc. R/B is an open drain signal, so I would think that its resistance would be very high.

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pepe
 Post subject: Re: how to use a logic analyzer to determine the 8bit flash
PostPosted: February 15th, 2022, 21:13 
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Joined: October 3rd, 2005, 0:40
Posts: 4756
Location: Hungary
I would expect the resistance of a 3state pin to be very high as well. Moreover, RB pins must have some pullup somewhere, which could make resistance lower. I would only expect some meaningful value in diode mode, but that also implies we would probably measure the ESD protection network...
The most informative check prior hooking up the LA is checking the suspected locations with an oscilloscope during power up of the device. Pads having no traffic are probably not interesting for us, at least not first
pepe

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arvika
 Post subject: Re: how to use a logic analyzer to determine the 8bit flash
PostPosted: February 16th, 2022, 5:14 
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Joined: October 24th, 2009, 15:22
Posts: 917
Location: Poland
1. Card you connected to LA has know pinout - very popular one. Find it.
2. Download and study datasheets from memory chips. You will find all information there. Look and compare signals based on know pinout.
3. Based on LA singals you paste on forum, probably you set wrong LA parameters to grab signals or have some shorts on wires.

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fzabkar
 Post subject: Re: how to use a logic analyzer to determine the 8bit flash
PostPosted: February 16th, 2022, 13:01 
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Joined: September 8th, 2009, 18:21
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Location: Australia
pepe wrote:
Moreover, RB pins must have some pullup somewhere, ...

Yeah, that was a brain fart. Oops.

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luojifenxiyi
 Post subject: Re: how to use a logic analyzer to determine the 8bit flash
PostPosted: February 16th, 2022, 17:40 
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Joined: February 14th, 2022, 13:29
Posts: 17
Location: finland
pepe wrote:
you need to catch known commands like read ID and figure out the signals. Get yourself familiar with NAND flas docs and timing diagrams.
It's a good idea to analyze a known device first...


Hi I have found a solution, I will find it this weekend,
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luojifenxiyi
 Post subject: Re: how to use a logic analyzer to determine the 8bit flash
PostPosted: February 16th, 2022, 17:42 
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Joined: February 14th, 2022, 13:29
Posts: 17
Location: finland
arvika wrote:
1. Card you connected to LA has know pinout - very popular one. Find it.
2. Download and study datasheets from memory chips. You will find all information there. Look and compare signals based on know pinout.
3. Based on LA singals you paste on forum, probably you set wrong LA parameters to grab signals or have some shorts on wires.


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luojifenxiyi
 Post subject: Re: how to use a logic analyzer to determine the 8bit flash
PostPosted: February 16th, 2022, 17:44 
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Joined: February 14th, 2022, 13:29
Posts: 17
Location: finland
fzabkar wrote:
I have zero experience in this area, but I would think that static resistance measurements would be useful.

For example, D0 - 7 would probably have very similar resistances to ground and Vcc. R/B is an open drain signal, so I would think that its resistance would be very high.


Hi I have found a solution, I will find it this weekend, thank you. If the problem is solved, I will teach you the method


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luojifenxiyi
 Post subject: Re: how to use a logic analyzer to determine the 8bit flash
PostPosted: February 17th, 2022, 16:53 
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Joined: February 14th, 2022, 13:29
Posts: 17
Location: finland
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2022-02-17_225023.jpg
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arvika wrote:
1. Card you connected to LA has know pinout - very popular one. Find it.
2. Download and study datasheets from memory chips. You will find all information there. Look and compare signals based on know pinout.
3. Based on LA singals you paste on forum, probably you set wrong LA parameters to grab signals or have some shorts on wires.
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luojifenxiyi
 Post subject: Re: how to use a logic analyzer to determine the 8bit flash
PostPosted: February 17th, 2022, 16:54 
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Joined: February 14th, 2022, 13:29
Posts: 17
Location: finland
Attachment:
File comment: I have completed, successfully analyzed
2022-02-17_225056.jpg
2022-02-17_225056.jpg [ 167.26 KiB | Viewed 9781 times ]
fzabkar wrote:
pepe wrote:
Moreover, RB pins must have some pullup somewhere, ...

Yeah, that was a brain fart. Oops.
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luojifenxiyi
 Post subject: Re: how to use a logic analyzer to determine the 8bit flash
PostPosted: February 17th, 2022, 16:56 
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Joined: February 14th, 2022, 13:29
Posts: 17
Location: finland
Attachment:
File comment: I have completed, successfully analyzed
2022-02-17_225056.jpg
2022-02-17_225056.jpg [ 167.26 KiB | Viewed 9781 times ]
fzabkar wrote:
pepe wrote:
Moreover, RB pins must have some pullup somewhere, ...

Yeah, that was a brain fart. Oops.

Attachment:
File comment: I have completed, successfully analyzed
2022-02-17_225023.jpg
2022-02-17_225023.jpg [ 91.3 KiB | Viewed 9781 times ]


I have completed, successfully analyzed
I have completed, successfully analyzed
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fzabkar
 Post subject: Re: how to use a logic analyzer to determine the 8bit flash
PostPosted: February 18th, 2022, 3:43 
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Joined: September 8th, 2009, 18:21
Posts: 16997
Location: Australia
Nice work!

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