64-bit Data Flash Access Problem [MPC8245]
Steve,
I tried to use fp assembly instructions (like lfd). But my assembler has problems and doesnt let me generate my binary. I'm sorry I couldnt properly get you... Should I make use of sw floating points..? That means, should I access 64-bit data only through 64-bit operations..?
Thanks and Regards
Nebu
--------- Original Message ---------
DATE: Wed, 24 Sep 2003 13:31:50
From: Steven Blakeslee <[email protected]>
Quoted 28 lines
Are you sure you are not using software floating points?
Subject: 64-bit Data Flash Access Problem [MPC8245]
Hi
I have a set of 8 1GB data flash chips (Samsung) on an MPC8245 Ref. Board. These are on a 64-bit bus-mode.-------DBUS_SIZ[0-1]:DBUS_SIZ[2] = 110b -------
All 8 chips are selected by a single chip select (RCS1). Trying a 32-bit read from the Data Address Location after giving the Command to Access the flash IDs, only 4 flashes on a common byte lane seem to be responding. 32-bit writes appear only on the DH[0-31] and not on DL[0-31].
I am not very clear as to:
(a) How do we perform writes to send out data out on all 64-bits of the bus..?
(b) How would we ideally access 64-bit data through 32- bit reads..?
(c) Or must we *have* 64- bit read/write instructions..?many thanks in advance for any response ..
Quoted 9 lines
Regards
NebuNeed a new email address that people can remember
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Need a new email address that people can remember
Check out the new EudoraMail at
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