TMS570LS0914: Is it support 64 bit pointer address

Daniel Fang

Genius 11600 points

Part Number: TMS570LS0914

Run (*(volatile uint64 *)(0X08002432)) = （uint64）0x12345678; it will go to dabort,

Run (*(volatile uint32 *)(0X08002432)) = （uint64）0x12345678; It's running well.

Is it support 64 bits? How to solve it? My customer use many 64 bit pointer in their code.Thanks.

over 6 years ago

0 dzhou over 6 years ago

TI__Genius 9065 points

Daniel,

The 570LS09 architecture doesn't support 64-bit.

best regards,

David Zhou

0 Sunil Oak over 6 years ago in reply to dzhou

TI__Mastermind 49120 points

Daniel,

A 64-bit data write is supported, but the address being written must be aligned to a 64-bit boundary.

0 Daniel Fang over 6 years ago in reply to Sunil Oak

TI__Genius 11600 points

Sorry for I am confused. Which one's answer is right?

Could you kindly give a 64-bit operation example?

0 Sunil Oak over 6 years ago in reply to Daniel Fang

TI__Mastermind 49120 points

Daniel,

You can certainly do 64-bit data read/write operations. These are supported using the LDRD and STMD (load/store double) assembly instructions on the Cortex R4/5 processors.

One important requirement for all memory accesses is that the address of the access be aligned to the size of the access. Unaligned accesses cause an "alignment fault" and the CPU's response is a data abort (for data fetches). So a 64-bit access is only allowed to/from addresses that are aligned to a 64-bit boundary. In your example, the 64-bit write is allowed to addresses 0x08002430, 0x08002438, ...

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TMS570LS0914: Is it support 64 bit pointer address