Re: mpc8260 and flash

Le ven 04/10/2002 à 09:55, Gagneraud Christian a écrit :

Hi all,

Still now i use an mpc8260ads baord with Linux 2.4.4 from denx.de,
the 8260ADS board have 8Mbytes/32bits of flash organize as 4 chip 8bits
wise each. (on a flash SIMM: 4*(sharp 28f016) = 4*[2M*8bits] = 8MBytes
in 1 bank)

But now i have to make my own board.
I want to have 32MBytes/64bits of flash organize as 4 chip 16bits wise
each. ( 4*[Fujitsu MBM29LV650] = 4*[4M*16bits] = 32Mbytes, this chip is
supported by linux-mtd).


My first question is about Chip Selects and Write Enable lines:
- On ADS, the 4 flash chips CS signals are connected to MPC8260 CS0
(GPCM machine is use), and the 4 flash chips WE lines are conected to
the 4 bottom MPC8260 byte-WriteEnable signals.
- On my design i want to use 16 bits flash but they have only one WE
signal per device, is it possible to connect the 4 word-WriteEnable
lines to the MPC8260 byte-WriteEnable?

My second question (maybe related to the first) is about the MPC8260
Burst addresses lines (baddr[27..31])
- On ADS baddr[27..29] are connected to the A[2..0] of the flash chips.
Why are the MPC8260 baddr[27..29] connected to the flash ans why not the
MPC8260 A[27..29]

Forget this question, i found the information that i need:
=>[...]Thes pins are used in external master configuration[..]
So For my design, i don't care about baddr[], so i have to connect MPC
A[27..29] to flash A[2..0]

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