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From: lakshmi3489 on 25 Feb 2010 06:51 1. If I look at the spartan 3a 3400 dsp evaluation board schematic there is as SPI EEPROM. Looking at the part number it is a part number for a FLASH by Microchip(M25P16-VMW6G). 2. Looking at this example xspi_stm_flash_example.c though he mentions the same part number M25P16. Then why the name SPI EEPROM?????? --------------------------------------- Posted through http://www.FPGARelated.com
From: RCIngham on 25 Feb 2010 09:00 > >1. If I look at the spartan 3a 3400 dsp evaluation board schematic there is >as SPI EEPROM. Looking at the part number it is a part number for a FLASH >by Microchip(M25P16-VMW6G). > >2. Looking at this example xspi_stm_flash_example.c though he mentions the >same part number M25P16. > Then why the name SPI EEPROM?????? > Why SPI? Because the part is accessed via an SPI interface? Why EEPROM? Because "Flash" indicates a sub-type of "Electrically Erasable Programmable Read-Only Memory" that can be erased either in total or large segments. It appears that not everyone is old enough to remember "non-Flash" EEPROMs. HTH! --------------------------------------- Posted through http://www.FPGARelated.com
From: james on 25 Feb 2010 09:38 On Thu, 25 Feb 2010 08:00:18 -0600, "RCIngham" <robert.ingham(a)n_o_s_p_a_m.gmail.com> wrote: |It appears that not everyone is old enough to remember "non-Flash" |EEPROMs. |=============== I remember the old days of 2708 EPROMS. Those were a great step up from the old TTL PROMS. What a radicle idea then to use UV light to erase and then reprogram. james
From: johnp on 25 Feb 2010 10:01 On Feb 25, 6:38 am, james <bu...(a)bud.u> wrote: > On Thu, 25 Feb 2010 08:00:18 -0600, "RCIngham" > > <robert.ingham(a)n_o_s_p_a_m.gmail.com> wrote: > > |It appears that not everyone is old enough to remember "non-Flash" > |EEPROMs. > |=============== > > I remember the old days of 2708 EPROMS. Those were a great step up > from the old TTL PROMS. What a radicle idea then to use UV light to > erase and then reprogram. > > james 2708? Those were to easy to program. Try the old 1702A... -48V programming. Ouch. As I recall, the Intel programmer had big power transistors. Touch to program, but a whooping 256 bytes of memory. John Providenza
From: austin on 25 Feb 2010 17:04
John, I just love the Dilbert cartoon where they try to out-do each other about the 'old days:' "I used to program in 1's and 0's!" "That's nothing, all we had were l's and O's ( small letter L and capital letter O)" "Heck, all I had were 0's...." Yes, I have some 1702's, along with the 4004 4 bit CPU, and some 2102 SRAM devices Intel handed out to customers to "introduce" them to the microcomputer. I just remember that if you put the 1702 in the socket rotated 180 degrees, it blew out all the bond wires. Someone came to the lab one day saying "did you know that the EPROM lights up when you program it?" Austin |