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rahulsoni
Contributor II

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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Bulat
NXP TechSupport
NXP TechSupport

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

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rahulsoni
Contributor II

Hi, thank you. I am unable to find  A0 - A25. I am beginner in this field. Can you please help.635590723367673515.png

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Bulat
NXP TechSupport
NXP TechSupport

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.

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rahulsoni
Contributor II

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.

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Bulat
NXP TechSupport
NXP TechSupport

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.

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rahulsoni
Contributor II

Thank you.

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515 Views
Bulat
NXP TechSupport
NXP TechSupport

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

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