LPC55S69: unused SRAMX space

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LPC55S69: unused SRAMX space

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EugeneHiihtaja
Senior Contributor I

Hi !

SRAM X on CM33 code bus, ( 0x1400 0000 0x1400 7FFF ) 32 KB.

SRAMX_0 (0x1400 0000 to 0x1400 0FFF)   // 4KB

SRAMX_1 (0x1400 4000 to 0x1400 4FFF)   // 4KB  -> are used for Casper (total 8 KB).

SRAMX_2 (0x1400 6000 to 0x1400 65FF)  -> If CPU retention used in power-down mode,  is used (total 1.5 KB) by default in power API and this is user configurable within SRAMX_2 and SRAMX_3.

SRAMX_3  - not used

So we have 4*8KB blocks  but each block is only used partially by some peripherals.

Do I understand right and remain space can be used for common purposes ?

Peripherals is occupied exact and clearly specified part and remain part is safe for use ?

Regards,

Eugene

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2 Replies

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Sabina_Bruce
NXP Employee
NXP Employee

Hi Eugene,

Just to clarify, when you say that these are only partially used. Do you mean that  the SRAMX_0 and SRAMX_1 are used for casper and the SRAMX_2 and SRAMX_3 may be used for other purposes. 

If so, then yes you are correct you can use the remaining space for general purposes without a problem.

Best Regards,

Sabina

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EugeneHiihtaja
Senior Contributor I

Hi Sabina !

Yes, if they occupied by regular peripherals, remain parts are really not used.

I need confirmation for be sure.

Regards,

Eugene

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