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Am postat bine? FTDI Chip

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4 replies to this topic

#1
diaconuliviu

diaconuliviu

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Este vorba despre FT232RL.

Are un eeprom in care sint mentinute diverse date: descriere, serial, VID, PID
si doua zone mai interesante:
FTDI CHIP-ID, un id scris din fabrica, readonly si o zona variabila, USER AREA..

Ei, am tot cautat prin datasheet si alte documente dar n-am gasit ceva concret despre de unde si pina ude se regaseste fiecare zona.

Din auzite, 080-09f ar fi acea zona de FTDI Chip-ID,

Ca partea de eeprom ar fi de 96 bytes din cei 128, dar atit.

Ce zona de memorie ocupa fiecare, nu
daca stie cineva...multumesc.

#2
dexterash

dexterash

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Cred ca nu ai cautat destul:
http://www.ftdichip...._Area_Usage.pdf
http://www.ftdichip....NC1L(FT_000078)

Edited by dexterash, 28 August 2014 - 13:59.


#3
diaconuliviu

diaconuliviu

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AN_121 = primul link, nu scrie nimic de cei 32 bytes lipsa..scrie cite ceva de User area dar nimic despre amplasare, adrese, etc..
Il citisem


In a doua nimic macar despre user area, despre FTDI ChipID nimic

#4
tehnics

tehnics

    acolo unde vara-i zi la miezul noptii

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Scrie asa:
1. First block
Size – 128 bytes.
The start address of the user area within this 1st block is as follows: Start Address = 0x14 (for FT232B and FT245B)
0x16 (for FT2232D)
0x1A (for FT2232H and FT4232H)
2. Second block
Size – this depends on the length of the Manufacturer, ManufacturerId, Description and SerialNumber strings programmed into the EEPROM. More memory space is available if the length of the information strings is shortened. The Maximum length of the Manufacturer, ManufacturerId, Description and SerialNumber strings is 48 words. If all the 48 words are used, then no user area space is available. The following formula can be used to calculate the available free space of the 2nd block:
Formula:
User Area Size = (48 – (Manufacturer string + Description string + ManufacturerId string + SerialNumber string)) * 2
The start address of the user area within this 2nd block is as follows:
Start Address = the address following the last byte of SerialNumber string.


#5
diaconuliviu

diaconuliviu

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Aia se refera la FT232Bx, cele cu eeprom extern, additional..daca pui 93C46 sau 93C56..ai user area mai mare sau mai mica...


Eu scriu in primul post de FT232Rx, cel cu memorie inclusa, care are 128 bytes si EEPROM util 2x48 =96 bytes.

OK, unde e sscrisa partea de VID-PID-Denumire, etc, unde e CHIP_ID?


Si ce e diferenta 128-96=32 bytes?

Asta nu se explica nicaieri sau nu gasesc eu...

Am citit alea doua documente...chiar si Datasheetul 232R

Edited by diaconuliviu, 28 August 2014 - 14:28.


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