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| mithro | morning everyone | 01:28 |
|---|---|---|
| mithro | I assume all the people in the UK have gone to sleep? | 01:28 |
| Bertl_oO | probably most of them :) | 01:57 |
| mithro | Bertl_oO: so - the mapping on the Axiom side makes a difference to the mapping I choose on the TOFE side - hence why I was developing the schematics together | 01:58 |
| mithro | Bertl_oO: ideally, I'd like TOFE<-HiLink->TOFE and TOFE<-HiLink->Axiom, TOFE<-HiLink->(Axiom expansion board), all to work using the same design | 02:00 |
| Bertl_oO | well, I think the mapping on the axiom side doesn't really affect this, as long as the TOFE-Axiom adapter is sound | 02:01 |
| Bertl_oO | as I said before, I think it makes sense to have a 3 DP dual slot plugin on the axiom side, but don't let me stop you from designing your own single slot plugin | 02:03 |
| mithro | Bertl_oO: From what I can see, you need 2xDP per axiom "slot", so I think we need 4 DP for the dual slot plugin? | 02:04 |
| Bertl_oO | we don't have enough LVDS pairs for 2x DP per axiom slot | 02:04 |
| Bertl_oO | 1xDP = 4LVDS pairs | 02:05 |
| Bertl_oO | 1xslot = 6LVDS pairs | 02:05 |
| Bertl_oO | 2xslot = 12LVDS pairs = 3xDP | 02:05 |
| mithro | Bertl_oO: oh, in this the DP is for a cheap high speed compatible connector, not actually DP :) | 02:06 |
| Bertl_oO | yes, but still, we can't go to high speed on the GPIOs | 02:06 |
| Bertl_oO | so no point in having a separate connector (or lanes) for that | 02:06 |
| Bertl_oO | further there is no space for four DP connectors on the dual plugin module | 02:07 |
| Bertl_oO | 3 miniDP will barely fit I guess | 02:07 |
| mithro | 1 x DP gives you 4 x High speed LVDS pairs + 1 x Low speed LVDS pair (AUX) and 3 x IO pins (HPD, Config1, Config2) | 02:08 |
| Bertl_oO | I also don't see a problem with the 4xDP TOFE side here, as long as the DP high speed pairs connect to LVDS pairs | 02:08 |
| mithro | Bertl_oO: The Axiom connector has 6 LVDS pairs + 8 x IO pins + SDA/SCL, right? | 02:09 |
| Bertl_oO | we have 16 GPIO and two I2C, the 16 GPIO should be able to fill up 3x5 IOs on DP | 02:09 |
| Bertl_oO | so we can do 4xLVDS and 5 GPIO for each of the 3x mini DP | 02:10 |
| mithro | Bertl_oO: btw is there any issue mounting connectors on both sides of the axiom board? | 02:11 |
| Bertl_oO | it complicates things with routing and layout (might not work with OSHpark) and it might also be problematic with future case designs ... i.e. I'd rather avoid it | 02:13 |
| mithro | Bertl_oO: Hrm... You have 44 pins in total (for 2 interfaces), and I should have 45 pins available on the TOFE unless I've miscounted somehow | 02:15 |
| Bertl_oO | should be fine then :) | 02:17 |
| mithro | Bertl_oO: so, I think I've miscounted somewhere.... | 02:17 |
| Bertl_oO | I also think you should have more | 02:17 |
| Bertl_oO | off to bed now ... have a good one | 02:37 |
| mithro | Bertl_oO: sleep well! | 02:37 |
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| tumbleweed | 1024x769 doesn't work with chromebooks. Not suprised :P | 11:24 |
| tumbleweed | 768 even | 11:24 |
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| CarlFK | tumbleweed: chromebook!!! | 16:41 |
| CarlFK | hook up, wait for chromebook to settle, hit reset button on Atlys | 16:41 |
| CarlFK | or "video_mode 8" (or whatever 1024x768 is.. even if it is already set, there is some side effect that makes Jay's chromebook work with 720p | 16:42 |
| tumbleweed | CarlFK: hrm, then I have to remember whose chromebook it was | 16:44 |
| tumbleweed | I'll try | 16:44 |
| CarlFK | Jay is a PS1 member. this is what I found on his 1 machine. it was before pyconza and there have been at least 1 firmware update that may have addressed it. I have not meet up with Jay to test. | 16:45 |
| tumbleweed | my laptop certainly doesn't cause that problem any more | 16:47 |
| tumbleweed | CarlFK: no, it sees 640x480, even though the chromebook says it's sending 1024x768 | 16:52 |
| tumbleweed | if I switch to mode 0, it works :( | 16:52 |
| CarlFK | huh. | 16:54 |
| CarlFK | heh... that's slighty better. | 16:55 |
| CarlFK | last time I checked Jays, input1: 860x3 | 16:56 |
| CarlFK | (or some such numbers that were just whack_ | 16:56 |
| tumbleweed | so, apparently all HDMI are required to support 640x480@60, which is why when the chromebook is given a mode it won't support, it went back to it | 17:05 |
| tumbleweed | (I just had an HDMI engineer come over and talk to me) | 17:05 |
| tumbleweed | he also suggests outputting a CEA-861 block https://en.wikipedia.org/wiki/Extended_Display_Identification_Data#EDID_1.3_data_format | 17:05 |
| tpb | Title: Extended Display Identification Data - Wikipedia, the free encyclopedia (at en.wikipedia.org) | 17:05 |
| CarlFK | tumbleweed: show him the source!!! /me prays | 17:08 |
| tumbleweed | he said "ah, that's only 128 bytes, you should send the CEA-861 block too" | 17:08 |
| tumbleweed | matthew sweet, btw | 17:08 |
| CarlFK | matthew sweet .. name rings a bell | 17:10 |
| CarlFK | xorg dev? | 17:10 |
| tumbleweed | yeah, rings a bell to me too, but I couldn't say what. lugradio, perhaps? | 17:10 |
| tumbleweed | he said if we want to know more, we must buy a spec :P | 17:10 |
| CarlFK | lol | 17:11 |
| CarlFK | I hear the firmware is easy to hack on | 17:11 |
| CarlFK | posting those two bits to a github issue | 17:25 |
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| seaLne | mithro: do you happen to know if the eeprom on the vmod-vga is just for identification and therefore replaced by the tofe one? | 17:31 |
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| CarlFK | rohitksingh: ^^^ | 18:04 |
| CarlFK | rohitksingh: (11:28:38 AM) seaLne: mithro: do you happen to know if the eeprom on the vmod-vga is just for identification and therefore replaced by the tofe one? | 18:04 |
| CarlFK | rohitksingh: hi! | 18:04 |
| rohitksingh | CarkFK: hi! | 18:16 |
| rohitksingh | seaLne / CarlFK : yeah, that EEPROM is just for identification of correct expansion board plugged into the main board...so that the mainboard can properly configure it automatically | 18:18 |
| rohitksingh | seaLne: but I don't understand what you mean by "replaced by TOFE one"? | 18:19 |
| CarlFK | rohitksingh: the VGA in/out are not connected to each other, right? each is connected to the fpga, and it can read/write each independently ? | 18:20 |
| CarlFK | (this is all different from seaLne question) | 18:20 |
| rohitksingh | CalFK: no...VGA_out is directly connected to VGA_in...so that it can act as a passthru...for example VGA output from a Laptop can go to the vmod-vga and from there you can still take a wire and connect it to a projector or something else | 18:22 |
| rohitksingh | while simultaneously capturing VGA data... | 18:23 |
| rohitksingh | I hope I could make it clearer | 18:23 |
| CarlFK | rohitksingh: thats fine, I get it. same as the Twinpact | 18:24 |
| rohitksingh | CarlFK: I guess...I don't have much knowledge on Twinpact other than just seeing it when you had shown it during sprints! :) | 18:25 |
| rohitksingh | but I guess it must be doing pass-through | 18:26 |
| CarlFK | it is | 18:26 |
| CarlFK | can the fpga supply edid to the laptop vga? | 18:27 |
| rohitksingh | CarlFK: yes...vmod-vga has provisions for that... DDC (I2C) lines of VGA in & out have been connected to FPGA to enable edid control | 18:36 |
| CarlFK | good. | 18:47 |
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