USB2.0Mass Storage controller + 8051 Low Power?

I have been trying to find a device with a MPU core and a USB 2.0 interface. 
Prefer if the MPU is 8051 but it doesn't matter. Must be low power with 
suspend currents under 30uA. I have seen the Cypress units and they are 
almost perfect but the wake-up time is ~5ms. My current design is up and 
running in around 120us after wake up. It is a data logger so it wakes up as 
fast as every 10ms and spends around 50us collecting data,

Currently I provide the NAND flash translation layer in the firmware on the 
device. I am pursuing this solution so that I may have the USB mass storage 
capability making data upload easier.

Elan.

Elan Magavi wrote:

> I have been trying to find a device with a MPU core and a USB 2.0 interface. 
> Prefer if the MPU is 8051 but it doesn't matter. Must be low power with 
> suspend currents under 30uA. I have seen the Cypress units and they are 
> almost perfect but the wake-up time is ~5ms. My current design is up and 
> running in around 120us after wake up. It is a data logger so it wakes up as 
> fast as every 10ms and spends around 50us collecting data,
> 
> Currently I provide the NAND flash translation layer in the firmware on the 
> device. I am pursuing this solution so that I may have the USB mass storage 
> capability making data upload easier.

I guess USB devices simply don't target fast wakeup, so you may need two 
cores in this, for the lowest power. 10ms/50us sounds like a RTC firing 
an on 0nChip Osc into action (C8051F410, MSP430 etc), and then the USB 
is the users access side, not used during data store ?

-jg

"Jim Granville" <no.spam@designtools.maps.co.nz> wrote in message 
news:45786660$1@clear.net.nz...
> Elan Magavi wrote:
>
>> I have been trying to find a device with a MPU core and a USB 2.0 
>> interface. Prefer if the MPU is 8051 but it doesn't matter. Must be low 
>> power with suspend currents under 30uA. I have seen the Cypress units and 
>> they are almost perfect but the wake-up time is ~5ms. My current design 
>> is up and running in around 120us after wake up. It is a data logger so 
>> it wakes up as fast as every 10ms and spends around 50us collecting data,
>>
>> Currently I provide the NAND flash translation layer in the firmware on 
>> the device. I am pursuing this solution so that I may have the USB mass 
>> storage capability making data upload easier.
>
> I guess USB devices simply don't target fast wakeup, so you may need two 
> cores in this, for the lowest power. 10ms/50us sounds like a RTC firing an 
> on 0nChip Osc into action (C8051F410, MSP430 etc), and then the USB is the 
> users access side, not used during data store ?
>
> -jg
>


You may be right. This was the conclusion I was coming to! The cores would 
share the FLASH and the nonUSB core would have to step through the FAT to 
store.. Sure hate to do that 'cause I have a size limitation. 

Elan Magavi wrote:

> I have been trying to find a device with a MPU core and a USB 2.0 interface. 

If you mean a USB 2.0 High Speed in a MPU, I have yet to see one.

For that matter, I have not seen a High Speed stand alone chip either.

Good Luck

donald


> Prefer if the MPU is 8051 but it doesn't matter. Must be low power with 
> suspend currents under 30uA. I have seen the Cypress units and they are 
> almost perfect but the wake-up time is ~5ms. My current design is up and 
> running in around 120us after wake up. It is a data logger so it wakes up as 
> fast as every 10ms and spends around 50us collecting data,
> 
> Currently I provide the NAND flash translation layer in the firmware on the 
> device. I am pursuing this solution so that I may have the USB mass storage 
> capability making data upload easier.
> 
> Elan.
> 
> 
> 

>
>> Prefer if the MPU is 8051 but it doesn't matter. Must be low power with 
>> suspend currents under 30uA. I have seen the Cypress units and they are 
>> almost perfect but the wake-up time is ~5ms. My current design is up and 
>> running in around 120us after wake up. It is a data logger so it wakes up 
>> as fast as every 10ms and spends around 50us collecting data,
>>
>> Currently I provide the NAND flash translation layer in the firmware on 
>> the device. I am pursuing this solution so that I may have the USB mass 
>> storage capability making data upload easier.
>>
>> Elan.
>>
>>


"Donald" <Donald@dontdoithere.com> wrote in message 
news:JZOdnRwMoecdcuXYnZ2dnUVZ_vudnZ2d@comcast.com...
> Elan Magavi wrote:
>
>> I have been trying to find a device with a MPU core and a USB 2.0 
>> interface.
>
> If you mean a USB 2.0 High Speed in a MPU, I have yet to see one.
>
> For that matter, I have not seen a High Speed stand alone chip either.
>
> Good Luck
>
> donald
>


See the Cypress FX2LP chips.
Also very cool are the MoBL-USB chips on the same page.

http://www.cypress.com/portal/server.pt?space=CommunityPage&control=SetCommunity&CommunityID=209&PageID=215&gid=9&fid=285&category=All&showall=false

They all have 8051 cores.

ST Micro also has a device, as does Dallas.