PowerQuad on LPC55S66

[zixunli]

Hi,

According to UM11126:

In the LPC55S6x, the PowerQuad uses SRAM Bank 4 (16kB at 0x2004 0000 to 3FFF
or 0x3004 0000 to 3FFF depending on the Secured or Non Secured Configuration) for
scratch pad.

However there is no SRAM4 on 144KB devices:

RAM Total	RAM-X (KB)	RAM0 (KB)	RAM1 (KB)	RAM2 (KB)	RAM3 (KB)	RAM4 (KB)	USB-RAM (KB)
144 KB devices	32	64	32	-	-	-	16

So does PowerQuad works on this part ?

[zixunli]

Hi,

Thanks for your reply.

Could you give me more detail:

• What's the performance difference if RAM4 is not used ?
• How to use other RAM area ? I haven't found any information in reference manual and in kSDK.

[xiangjun_rong]

Hi,

I see that the LPC55S66 has just 144K SRAM and does not have RAM4 memory.

I will ask the AE team if the PowerQuad can work without RAM4 module. Pls be patient.

BR

XiangJun Rong

[xiangjun_rong]

Hi,

This is the AE team reply:

"PQ can work with LPC55S66. The use of RAM4 is optional, if using RAM4, QR can reach best performance, with PQ can also use other RAM area.

"

It means that the PowerQuad of LPC55S66 can work without RAM4 module.

Hope it can help you

BR

XiangJun Rong