What would you like to see in The Next Chip?

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yangff
Posts: 11
Joined: Thu Jun 22, 2017 2:11 pm

Re: What would you like to see in The Next Chip?

Postby yangff » Mon May 07, 2018 9:04 am

What about improve the functional pin mapping? Many boot strapping pins and other pins that used by on board flash makes it hard for pin arrangement. More confusing, SDIO even overlapped with bootstrapping pins and have different pull-up/down requirements for a 3.3v flash... Also, the exists of these pins makes it hard for using them in many general usages. If I connect it to SD card, it's fine to use internal pull-up after boot. But if I'm trying to use them to some other proposes, it's likely to cause booting problems...

And, if some of these pins are floating (I'm not sure if it's floating, but this issue happens on my nodemcu), it makes ESP32 hard to boot when plug-in to usb cable. And if you somehow touch or just connect a jump wire it become normal.

I think may be one EN pin or at most two pins to be used as boot pin is enough. Sending a special sequence after reset to determine all boot modes (serial-usb chip can take care of this) and move all other selection to efuse instead of exposing them to normal GPIOs to prevent boot strapping pin issues.

Also, if you don't like to use a larger package. In some packages like esp32-pico, considering connect flash pins internally in packages, leave them in the package and provide some extra IOs on the package instead of those hard to use SDIO pins so we can have more IOs in the same package size.
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daiyinger
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Joined: Tue Oct 31, 2017 2:02 pm

Re: What would you like to see in The Next Chip?

Postby daiyinger » Tue May 08, 2018 1:28 am

more interface，like CAN
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wwwenrico
Posts: 22
Joined: Thu Apr 26, 2018 9:29 am
Location: Italy

What I would like to see in the next IoT chip

Postby wwwenrico » Wed May 23, 2018 9:48 pm

Hi,

I would like to give my little contribution to the "What I would like to see in the next IoT chip" discussion.

This is my backgorund:
I've been designing boards with GSM/GPRS/3G modules and software drivers for 22 years.
I started to work in 1998 on the old Siemens M20 and I'm now working on the Gemalto EHS5 3G modem.
I've been working also for 2 years now on the ESP32 platform.


What I would like to see in the next IoT chip is:

1. Two cores with physically separated address spaces.

2. The first core will host the WiFi stack and an AT command interpreter able to work also in transparent mode in order to maximize the data throughput.

3. The second core will host the user's application program WITHOUT any kind of RTOS.

4. The 2 cores will be connected only by an internal USB interface at 12 MHz (Virtual COM)
or by a synchronous communication full duplex interface with DMA support.

5. All the common peripherals like ADC, SPI, I2S, UART, CSI et cetera will be mapped in the address space of the second core.

6. The first core will have a 5-stage pipeline with physically separated instruction and data buses (like ARM9 and ARM11).

7. The first and the second core will be licensed by ARM.

8. Windows native development tools.

Thanks,
Enrico Migliore
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wwwenrico
Posts: 22
Joined: Thu Apr 26, 2018 9:29 am
Location: Italy

Re: What I would like to see in the next IoT chip

Postby wwwenrico » Thu May 24, 2018 3:58 pm

Hi,

I'll also would like to see:


9. Wettable flanks QFN package like Texas Instruments and NXP for easy automatice AOI inspection:

https://e2e.ti.com/blogs_/b/behind_the_ ... plications

https://e2e.ti.com/blogs_/b/behind_the_ ... ble-flanks

http://cache.freescale.com/files/traini ... -F0026.pdf


Unfortunately it's a patented package: https://patents.google.com/patent/US20120292755



10. A dedicated RESET pin


Thanks,
Enrico Migliore
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Vader_Mester
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Re: What would you like to see in The Next Chip?

Postby Vader_Mester » Mon May 28, 2018 7:00 am

What strikes me in the ESP32 is the amount of computing power it has, but the lack of RAM.
I see that people are struggling with RAM amount on the chip, so 1MB RAM would be sufficient in the next chip, with a little bit bigger IRAM space, for insturction usage.

This would enable the user to store mure functions in IRAM, and use the RAM more extensively.

Code: Select all

task_t coffeeTask()
{
	while(atWork){
		if(!xStreamBufferIsEmpty(mug)){
			coffeeDrink(mug);
		} else {
			xTaskCreate(sBrew, "brew", 9000, &mug, 1, NULL);
			xSemaphoreTake(sCoffeeRdy, portMAX_DELAY);
		}
	}
	vTaskDelete(NULL);
}
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ESP_Sprite
Posts: 9757
Joined: Thu Nov 26, 2015 4:08 am

Re: What would you like to see in The Next Chip?

Postby ESP_Sprite » Mon May 28, 2018 10:28 am

yangff: Yes, we know the bootstrap mapping in the ESP32 is... suboptimal. We have learned from that, and the next chip should have the bootstraps on less conflicting pins. The idea to have internal pads to connect flash is a good one and it has ocurred to us before - expect this to turn up in the next chip as well.

wwwenrico: Don't count on that. We quite like the choice of a multitasking, multicore environment, and while separating cores makes sense for some things (e.g. security), it's not something we'll do just randomly. Especially internal USB makes no sense from a chip design perspective. What might help convince us is you stating what the reason is you architecturally need this specific setup and why an XTensa-based SMP setup cannot work in that scenario.

Vader_Mester: No promises on more RAM, although we're certainly looking at our options. (Issue is that RAM is relatively expensive; iirc, 3/4th of the silicon of the ESP32 is taken up by it.) FWIW, the next chip will allow the RAM to be partitioned more precisely, as in: of the RAM that is in the chip, the large majority of it can be configured as either IRAM or DRAM.

(Note: As usual, 'it will be in the next chip' is under the condition that our plans don't change last-minute.)
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Vader_Mester
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Re: What would you like to see in The Next Chip?

Postby Vader_Mester » Mon May 28, 2018 12:43 pm

ESP_Sprite wrote: Vader_Mester: No promises on more RAM, although we're certainly looking at our options. (Issue is that RAM is relatively expensive; iirc, 3/4th of the silicon of the ESP32 is taken up by it.) FWIW, the next chip will allow the RAM to be partitioned more precisely, as in: of the RAM that is in the chip, the large majority of it can be configured as either IRAM or DRAM.
I thought that it's the case.
Probably more pins might help solving the issue to be able to use external RAM on a parallel bus. Some STM32 models has this option, and used extensively.
The PSRAM is not the best option, since it uses up the precious SPI bus for flash reads.

Code: Select all

task_t coffeeTask()
{
	while(atWork){
		if(!xStreamBufferIsEmpty(mug)){
			coffeeDrink(mug);
		} else {
			xTaskCreate(sBrew, "brew", 9000, &mug, 1, NULL);
			xSemaphoreTake(sCoffeeRdy, portMAX_DELAY);
		}
	}
	vTaskDelete(NULL);
}
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mikemoy
Posts: 627
Joined: Fri Jan 12, 2018 9:10 pm

Re: What would you like to see in The Next Chip?

Postby mikemoy » Mon May 28, 2018 4:07 pm

The PSRAM is not the best option, since it uses up the precious SPI bus for flash reads.
Maybe, dedicated pads for PSRAM.
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ESP_Sprite
Posts: 9757
Joined: Thu Nov 26, 2015 4:08 am

Re: What would you like to see in The Next Chip?

Postby ESP_Sprite » Tue May 29, 2018 1:06 am

FWIW, the next chip in all probability is going to have a larger package (and thus more I/O) than the current ESP32.
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meneldor
Posts: 75
Joined: Mon Dec 25, 2017 7:28 am

Re: What would you like to see in The Next Chip?

Postby meneldor » Tue May 29, 2018 5:27 am

What i want for the next chip is to send to some of us (the community) the first chips for beta testing/reviews :D :roll:
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