06 April 2018, 10:21 | #3041 | |
Registered User
Join Date: Feb 2018
Location: Nürnberg
Posts: 97
|
Quote:
Dave made an interesting video regarding just that. The decoupling is mostly dependent on frequency. He also shows that in one of his test setups, the second added capacitor makes the bandwidth even worse. |
|
06 April 2018, 11:52 | #3042 | |
Banned
Join Date: Sep 2016
Location: UK
Posts: 2,917
|
Terrible Fire Accelerators
Quote:
Seen. Taught at uni even. In theory I shouldn’t have an issue but I need to measure what’s happening. Plus I always use X7R multilayer caps which do this pretty much for free. I think I’m just low on caps. Last edited by plasmab; 06 April 2018 at 12:13. |
|
06 April 2018, 14:31 | #3043 |
Registered User
Join Date: Jan 2017
Location: Eastbourne
Posts: 88
|
@Plasmab just wondering with this @ different lower frequencies under 50Mhz does the behaviour change.
|
06 April 2018, 14:35 | #3044 | |
Retro maniac
Join Date: Feb 2017
Location: near Munich / Germany
Posts: 486
|
Quote:
reWatched last stream and noticed that You have done Your research with FPU istalled..i'm suspecting the FPU can cause some errors, maybe You should try to remove it and look how TF534 works without it? Another question, why on all retro accelerators the frequency generated from the crystal oscillator is divided to 2? Does it improoves stability in some way? |
|
06 April 2018, 14:56 | #3045 | |
Banned
Join Date: Sep 2016
Location: UK
Posts: 2,917
|
Quote:
I have the issue with or without the FPU. I have the issue anytime the cpu is running at any frequency above 12mhz. The ram cpld will not flash but will run. The 040 needs a doubled Pclk frequency from the Bclk.... but it’s usually so you can time on half clock steps in the logic. |
|
07 April 2018, 11:58 | #3046 |
Retro maniac
Join Date: Feb 2017
Location: near Munich / Germany
Posts: 486
|
|
07 April 2018, 17:33 | #3047 | |
Banned
Join Date: Sep 2016
Location: UK
Posts: 2,917
|
Quote:
It could be many things. I have not been putting JTAG terminator pull ups on. Going to try that. It’s not the clock itself. It’s when the cpu is running at 12mhz or above.. if it’s in a double bus error state it programs without issue. I suspect the bus buffer is causing the issue somehow but I am struggling to imagine why. |
|
07 April 2018, 21:00 | #3048 |
Registered User
Join Date: Jan 2017
Location: Eastbourne
Posts: 88
|
Hi Just wonder is it not something strange making the other triggers not to be left floating...
|
08 April 2018, 01:26 | #3049 |
Banned
Join Date: Sep 2016
Location: UK
Posts: 2,917
|
|
08 April 2018, 02:11 | #3050 |
Registered User
Join Date: Jan 2017
Location: Eastbourne
Posts: 88
|
Hi Plasmab, with the above^ was just wondering on the the buffer ic that some thing might be affecting the latching or clock, but I might be way off here so please forgive me.
Last edited by keith; 08 April 2018 at 03:12. |
08 April 2018, 10:42 | #3051 | |
Banned
Join Date: Sep 2016
Location: UK
Posts: 2,917
|
Quote:
Well yes. It’s the only major change between this board and the last revision so the buffer IC is going to be the obvious cause. It doesn’t latch anything though. It’s just a buffer. |
|
08 April 2018, 12:08 | #3052 |
Registered User
Join Date: Feb 2018
Location: Nürnberg
Posts: 97
|
Maybe the rise/fall time of the buffer ic is the culprit? To fast a edge, to slow a edge for the rest of the circuitry?
|
08 April 2018, 17:10 | #3053 |
Banned
Join Date: Sep 2016
Location: UK
Posts: 2,917
|
|
08 April 2018, 19:21 | #3054 |
Banned
Join Date: Sep 2016
Location: UK
Posts: 2,917
|
Ok i think i'm fighting about 3-4 issues at the same time.
1. DiagROM has an autoconfig bug in it with ZIII cards in the ZII space. 2. I have a jtag crosstalk issue.. not a problem now i know but it means i cannot reflash while the cpu is running. 3. I have a bus overlap issue occurring between fast ram and the buffer. Basically can all be sorted in firmware i think. |
09 April 2018, 03:32 | #3055 | |
Registered User
Join Date: Apr 2012
Location: Canada
Age: 44
Posts: 910
|
Quote:
I have however just built 4 TF530s running at different speeds and using ISSI ram to experiment with. RC1 fixed the ISSI ram support, however I am noticing that these boards start to crash on Frontier after 15 mins running, which is odd because they don't crash on anything else so far. I am going to try to go back to 10k resistor networks to see what happens. |
|
09 April 2018, 09:00 | #3056 | |
Banned
Join Date: Sep 2016
Location: UK
Posts: 2,917
|
Terrible Fire Accelerators
Quote:
A crash after ten mins might be CPU temp. Or at least that’s worth keeping an eye on. EDIT.. another random thought if you have a reproducible crash is to try a pull-up on DTACK ... 2.2K should be perfect. Last edited by plasmab; 09 April 2018 at 12:09. |
|
09 April 2018, 22:19 | #3057 | |
Retro maniac
Join Date: Feb 2017
Location: near Munich / Germany
Posts: 486
|
Quote:
We have almost summer here: 23° today with lot of sun..ideal weather for retrobright, lol Have prepared black one on the trip to Italy: Last edited by 8 Bit Dreams; 10 April 2018 at 00:39. |
|
10 April 2018, 14:58 | #3058 | |
Registered User
Join Date: Apr 2017
Location: Springfield, MO
Posts: 264
|
Quote:
Alen, I’ve seen the same behavior regardless of RAM. I’ve glued heat sinks to a few of them to see if it was indeed heat related. Sometimes the demo can loop as many as 6 times before locking up. I can’t otherwise crash these repeatably. Does the release you’re using begin with a hopping bunny cracktro? Perhaps I need to find another version. I haven’t tried 10k resistors. |
|
10 April 2018, 17:17 | #3059 | ||
Registered User
Join Date: Apr 2012
Location: Canada
Age: 44
Posts: 910
|
Quote:
Quote:
|
||
12 April 2018, 11:43 | #3060 |
Banned
Join Date: Sep 2016
Location: UK
Posts: 2,917
|
I’ve made some progress last night. Have family staying so haven’t streamed.
I got a spi rom chip, soldered it down and flashed it with a pi.... I have started compiling up flashrom for the tf53x series. |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
Thread Tools | |
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Listening to Amiga music with too much treble makes it sound terrible! | Foebane | Amiga scene | 4 | 08 October 2016 06:30 |
Terrible usb drive performance? | lovinggames | support.FS-UAE | 5 | 11 March 2015 09:06 |
Broken MASPlayer - Terrible hissing. | SS454 | support.Hardware | 8 | 17 November 2013 01:41 |
Accelerators | pmc | MarketPlace | 9 | 04 November 2009 20:23 |
Problem with a terrible, simply effect! | Camionsauro | Coders. General | 13 | 19 April 2009 08:53 |
|
|