Hi,

[rahulsoni]

Hi,

I am trying to interface T4240 freescale processor with S29GL01GS11TFIV1 NOR flash. Can you tell me which Latch i should use. Also provide the connections for interfacing.

Thank You.

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[rahulsoni]

Hi, thank you. I am unable to find  A0 - A25. I am beginner in this field. Can you please help.

[Bulat]

Left column lists signals of the NOR flash, including A0 - A25. Take a look at U2 device in your schematics, you will easily find these signals.

[rahulsoni]

Thank you Bulat Karymov, but i wanted to know how to connect AD[0:26] to D Latch when i have only 16 input pins in the latch. I mean either i must have 26 pins in D Latch or  some pins of processor must be " No Connect". If i have to connect latched AD5 to AD25, then still i need 21 pins in my latch, which is not available.

[Bulat]

In your figure the latch is 16-bit one. Since you need to latch 21 address signals, you need to add one latch device more. You can probably arrange three 8-bit latch devices. Without extending address latch, you will not be able to address 128MByte Flash memory.

[rahulsoni]

Thank you.

[Bulat · Accepted solution]

You can use any Latch that supports 1.8V power supply. FPGA or PLD can also be used.

Basic connections between the NOR flash and T4240 are as following:

Flash   -  Processor

--------------------------------

data

DQ0  -  IFC_AD15 

DQ1  -  IFC_AD14 

DQ2  -  IFC_AD13

... 

DQ15  -  IFC_AD0 

address

A0  -  IFC_A30 

A1  -  IFC_A29

...

A4  -  IFC_A26

A5  -  latched IFC_AD25 

A6  -  latched IFC_AD24 

A7  -  latched IFC_AD23 

...

A25  -  latched IFC_AD5

control

CE  -  IFC_CS0

OE  -  IFC_OE

WE  -  IFC_WE0