T1024 NOR Flash Connection

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T1024 NOR Flash Connection

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bltuna
Contributor II

Hi,

In T1024 reference manual, there is an example of x16 external latch based NOR Flash connection. It's mentioned in the example that a shift value of 5 is used in that example. However, I think the value shouldn't be 5 for both, should be 5 for x8 flash and 6 for x16 flash. If that so, the shift value should be 7 for a 25 bit x16 NOR Flash, right?

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alexander_yakov
NXP TechSupport
NXP TechSupport

From the T1024 side, each address value always addresses one byte regardless of port size, so address value output to address lines is not changed depending on port size. The only least significant bit becomes not used for connection. For 8 bit mode all address lines are used, for 16 bit mode each address addresses 2 bytes, so least significant address line becomes unused. This is shown as unused A26 at the above figure. If this address line is left unconnected, than you do not need to change anything in address shifting.


Have a great day,
Alexander

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alexander_yakov
NXP TechSupport
NXP TechSupport

From the T1024 side, each address value always addresses one byte regardless of port size, so address value output to address lines is not changed depending on port size. The only least significant bit becomes not used for connection. For 8 bit mode all address lines are used, for 16 bit mode each address addresses 2 bytes, so least significant address line becomes unused. This is shown as unused A26 at the above figure. If this address line is left unconnected, than you do not need to change anything in address shifting.


Have a great day,
Alexander

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Note: If this post answers your question, please click the Correct Answer button. Thank you!
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