It appears that there are 8Megabyte MRAM chips available at Digikey at about $50. Everspin is the brand we have been using. I think they invented the technology.
73,
Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*
MR25H40
4Mbit (512k x 8) is the largest they offer with SPI.
The larger ones are parallel with a larger form factor.
$17 to $27 Digi-Key depending on speed and temperature rating.
Jim McCullers
WA4CWI
It appears that there are 8Megabyte MRAM chips available at Digikey at about $50. Everspin is the brand we have been using. I think they invented the technology.
73,
Burns Fisher, WB1FJ
AMSAT(R) Engineering -- Flight Software
Thanks for checking deeper!
73,
Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*
On Thu, Nov 17, 2022 at 9:21 PM Jim McCullers [email protected] wrote:
MR25H40
4Mbit (512k x 8) is the largest they offer with SPI.
The larger ones are parallel with a larger form factor.
$17 to $27 Digi-Key depending on speed and temperature rating.
Jim McCullers
WA4CWI
It appears that there are 8Megabyte MRAM chips available at Digikey at about $50. Everspin is the brand we have been using. I think they invented the technology.
73,
Burns Fisher, WB1FJ
*AMSAT**(R) **Engineering -- Flight Software*
pacsat-dev mailing list -- [email protected] View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to [email protected] Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
I just noticed that there is another brand with a similar technology called FRAM made by Infineon (which has taken over the former maker, Cypress. In any case, they do have 8Mbx8 (i.e. 1 megabyte) parts. 73,
Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*
On Thu, Nov 17, 2022 at 9:22 PM Burns Fisher (AMSAT) [email protected] wrote:
Thanks for checking deeper!
73,
Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*
On Thu, Nov 17, 2022 at 9:21 PM Jim McCullers [email protected] wrote:
MR25H40
4Mbit (512k x 8) is the largest they offer with SPI.
The larger ones are parallel with a larger form factor.
$17 to $27 Digi-Key depending on speed and temperature rating.
Jim McCullers
WA4CWI
It appears that there are 8Megabyte MRAM chips available at Digikey at about $50. Everspin is the brand we have been using. I think they invented the technology.
73,
Burns Fisher, WB1FJ
*AMSAT**(R) **Engineering -- Flight Software*
pacsat-dev mailing list -- [email protected] View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to [email protected] Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
I forgot to include the link. Oddly, Mouser has them but Digikey does not even list them. Long lead time, but Mouser has a few hundred and are expecting even more in January.
https://www.mouser.com/ProductDetail/Infineon-Technologies/CY15B108QN-40SXI?...
73,
Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*
On Fri, Nov 25, 2022 at 4:21 PM Burns Fisher (AMSAT) [email protected] wrote:
I just noticed that there is another brand with a similar technology called FRAM made by Infineon (which has taken over the former maker, Cypress. In any case, they do have 8Mbx8 (i.e. 1 megabyte) parts. 73,
Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*
On Thu, Nov 17, 2022 at 9:22 PM Burns Fisher (AMSAT) [email protected] wrote:
Thanks for checking deeper!
73,
Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*
On Thu, Nov 17, 2022 at 9:21 PM Jim McCullers [email protected] wrote:
MR25H40
4Mbit (512k x 8) is the largest they offer with SPI.
The larger ones are parallel with a larger form factor.
$17 to $27 Digi-Key depending on speed and temperature rating.
Jim McCullers
WA4CWI
It appears that there are 8Megabyte MRAM chips available at Digikey at about $50. Everspin is the brand we have been using. I think they invented the technology.
73,
Burns Fisher, WB1FJ
*AMSAT**(R) **Engineering -- Flight Software*
pacsat-dev mailing list -- [email protected] View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to [email protected] Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
This reminds me to post my analysis of the potential storage requirements.
I modelled with an assumption that we might have 30 active users uploading about 3 meesags a day and that someone uploads a small image every day. The files expire after 10 days. I also modelled some telemetry and science data which expires more quickly but is higher volume.
I then did a second minimal scenario with smaller PACSAT File Headers and shorter retention times.
This indicates that we likely need 2MB of memory. More would be better. But these models are only as good as the input parameters. Feel free to play with the settings and see what you come up with.
https://github.com/AMSAT-NA/pacsat/blob/main/requirements/pacsat-memory-mode...
73 Chris
On Fri, Nov 25, 2022 at 9:40 PM Burns Fisher (AMSAT) [email protected] wrote:
I forgot to include the link. Oddly, Mouser has them but Digikey does not even list them. Long lead time, but Mouser has a few hundred and are expecting even more in January.
https://www.mouser.com/ProductDetail/Infineon-Technologies/CY15B108QN-40SXI?...
73,
Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*
On Fri, Nov 25, 2022 at 4:21 PM Burns Fisher (AMSAT) [email protected] wrote:
I just noticed that there is another brand with a similar technology called FRAM made by Infineon (which has taken over the former maker, Cypress. In any case, they do have 8Mbx8 (i.e. 1 megabyte) parts. 73,
Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*
On Thu, Nov 17, 2022 at 9:22 PM Burns Fisher (AMSAT) [email protected] wrote:
Thanks for checking deeper!
73,
Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*
On Thu, Nov 17, 2022 at 9:21 PM Jim McCullers [email protected] wrote:
MR25H40
4Mbit (512k x 8) is the largest they offer with SPI.
The larger ones are parallel with a larger form factor.
$17 to $27 Digi-Key depending on speed and temperature rating.
Jim McCullers
WA4CWI
It appears that there are 8Megabyte MRAM chips available at Digikey at about $50. Everspin is the brand we have been using. I think they invented the technology.
73,
Burns Fisher, WB1FJ
*AMSAT**(R) **Engineering -- Flight Software*
pacsat-dev mailing list -- [email protected] View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to [email protected] Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
pacsat-dev mailing list -- [email protected] View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to [email protected] Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
Nice model Chris. Thanks for this. Nice to have a model.
Bob
On Nov 26, 2022, at 10:00 AM, Chris Thompson <[email protected]mailto:[email protected]> wrote:
This reminds me to post my analysis of the potential storage requirements.
I modelled with an assumption that we might have 30 active users uploading about 3 meesags a day and that someone uploads a small image every day. The files expire after 10 days. I also modelled some telemetry and science data which expires more quickly but is higher volume.
I then did a second minimal scenario with smaller PACSAT File Headers and shorter retention times.
This indicates that we likely need 2MB of memory. More would be better. But these models are only as good as the input parameters. Feel free to play with the settings and see what you come up with.
https://github.com/AMSAT-NA/pacsat/blob/main/requirements/pacsat-memory-mode...https://url.emailprotection.link/?bcdu5ktwF5xEGB-vAlOUlSS4d-dNUBkAPY3sA9bqDTjaL_SIjVWNioAGnV_0HthV3pfmUMPEmEVt_pK6V_LAzCBZ-GYux0kI01pRgUlsuRYnTegChOXjveLuftMlhMfCC
73 Chris
On Fri, Nov 25, 2022 at 9:40 PM Burns Fisher (AMSAT) <[email protected]mailto:[email protected]> wrote: I forgot to include the link. Oddly, Mouser has them but Digikey does not even list them. Long lead time, but Mouser has a few hundred and are expecting even more in January.
https://www.mouser.com/ProductDetail/Infineon-Technologies/CY15B108QN-40SXI?...https://url.emailprotection.link/?bw8V9av86PY8m-sL5hze_wIHV4S5zbdBvh80QVjWxUoBDwDfnMU9ISK8Yypx9c7FIlRgUqP_8I6tXutuHzSvxAEHV1gl2FoJt8bsr6f57s5fTvoDUoDvHlf8mAa8npk0a4J7QEGD7ae9btHLEI3YZN568wegGCGXdbxAlSFQXq2DmCrHvvJqgkcy-dlpnLD0LbJAvrwnCYVLzS2RCBxkHDQ~~
73,
Burns Fisher, WB1FJ AMSAT(R) Engineering -- Flight Software
On Fri, Nov 25, 2022 at 4:21 PM Burns Fisher (AMSAT) <[email protected]mailto:[email protected]> wrote: I just noticed that there is another brand with a similar technology called FRAM made by Infineon (which has taken over the former maker, Cypress. In any case, they do have 8Mbx8 (i.e. 1 megabyte) parts. 73,
Burns Fisher, WB1FJ AMSAT(R) Engineering -- Flight Software
On Thu, Nov 17, 2022 at 9:22 PM Burns Fisher (AMSAT) <[email protected]mailto:[email protected]> wrote: Thanks for checking deeper!
73,
Burns Fisher, WB1FJ AMSAT(R) Engineering -- Flight Software
On Thu, Nov 17, 2022 at 9:21 PM Jim McCullers <[email protected]mailto:[email protected]> wrote: MR25H40
4Mbit (512k x 8) is the largest they offer with SPI. The larger ones are parallel with a larger form factor. $17 to $27 Digi-Key depending on speed and temperature rating.
Jim McCullers WA4CWI
It appears that there are 8Megabyte MRAM chips available at Digikey at about $50. Everspin is the brand we have been using. I think they invented the technology.
73,
Burns Fisher, WB1FJ AMSAT(R) Engineering -- Flight Software ----------------------------------------------- pacsat-dev mailing list -- [email protected]mailto:[email protected] View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected]https://url.emailprotection.link/?buUg7YY4HZLXKo6ZKNudC8bRTBdOsBlAV5C9rq-aqxOQfa9Eqh8kfGK8xAPNkaYeV4y3Z5HVIEvNBaAimp_ZfFMwcw8QT0XZxGj2iXsHa3mcBRxu810JiHLaLtHS4Ej_7 To unsubscribe send an email to [email protected]mailto:[email protected] Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.orghttps://url.emailprotection.link/?bO71JCUf8Kb7txAlIoAarNqcIdQhyb8VQQIN4j0Gik24jnwI-Byk6ZVn92BYiD7Bxz61XZBoNoJE1TKqdfKnwFw~~ ----------------------------------------------- pacsat-dev mailing list -- [email protected]mailto:[email protected] View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected]https://url.emailprotection.link/?buUg7YY4HZLXKo6ZKNudC8bRTBdOsBlAV5C9rq-aqxOQfa9Eqh8kfGK8xAPNkaYeV4y3Z5HVIEvNBaAimp_ZfFMwcw8QT0XZxGj2iXsHa3mcBRxu810JiHLaLtHS4Ej_7 To unsubscribe send an email to [email protected]mailto:[email protected] Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.orghttps://url.emailprotection.link/?bO71JCUf8Kb7txAlIoAarNqcIdQhyb8VQQIN4j0Gik24jnwI-Byk6ZVn92BYiD7Bxz61XZBoNoJE1TKqdfKnwFw~~
-- Chris E. Thompson [email protected]mailto:[email protected] [email protected]mailto:[email protected] ----------------------------------------------- pacsat-dev mailing list -- [email protected]mailto:[email protected] View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to [email protected]mailto:[email protected] Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
participants (4)
-
Bob Stricklin -
Burns Fisher (AMSAT) -
Chris Thompson -
Jim McCullers