CCS/TMS320F280049: CCS memory allocation view unit used for C2000

Wayne Huang

Genius 16355 points

Part Number: TMS320F280049

Tool/software: Code Composer Studio

Dear Champs,

I am asking this for our customer.

On CCS, the user uses the memory view like below.

Questions:

1. The unit is byte or word?

In the above figure, it shows 2814 out of 4096 "bytes" used.

We are confused.

Is the unit here in byte or in word?

(1 word = 2 bytes for C2000 devices)

From the corresponding .map file, it should be in word rather than in byte, correct?

2. Is the result of the memory allocation view directly from the .map file?

Wayne Huang

over 4 years ago

0 Ki over 4 years ago

TI__Guru**** 465151 points

Hi Wayne,

Wayne Huang said:

Is the unit here in byte or in word?

(1 word = 2 bytes for C2000 devices)

It is in bytes (which is the same as a word for C28x)

https://software-dl.ti.com/ccs/esd/documents/c2000_c28x-code-generation-tips-and-tricks.html#variable-types

Wayne Huang said:
2. Is the result of the memory allocation view directly from the .map file?

It is actually from an xml file that is generated by the linker (in the same location as the map file)

Thanks

0 Wayne Huang over 4 years ago in reply to Ki

TI__Genius 16355 points

Dear Ki

Do you mean 1 byte = 1 word = 16 bits in C2000?

It seems different from the descriptions on the datasheet.

For example,

See 6.3.3 Flash Memory Map of F28004x datasheet, it says,

On the F28004x devices, up to two flash banks (each 128KB [64KW]) are available.

Do you have any comment?

Wayne

0 Ki over 4 years ago in reply to Wayne Huang

TI__Guru**** 465151 points

Wayne Huang said:
Do you mean 1 byte = 1 word = 16 bits in C2000?

Yes. Please see: https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/878116

Wayne Huang said:

See 6.3.3 Flash Memory Map of F28004x datasheet, it says,

On the F28004x devices, up to two flash banks (each 128KB [64KW]) are available.

I can't comment on the datasheet. I will bring this thread to the attention of the device experts so they can comment

0 Wayne Huang over 4 years ago in reply to Ki

TI__Genius 16355 points

Dear Ki,

If so, can we modify the memory allocation view to show words instead of bytes to avoid confusion because most people think 1 byte = 8 bits as they read the datasheet for the memory allocation?

In fact, other part of the datasheet also shows it in this way.

Or maybe we can show a comment on the memory allocation view to clarify this.

What do you think?

Wayne Huang

0 JohnS over 4 years ago in reply to Wayne Huang

TI__Guru**** 162315 points

Wayne,

A byte and word are 16bits on C28x.

I asked for clarfication on what the datasheet is showing and the explanation is because when comparing to other devices where bytes are 8bit it is being shown this way for memory size comparison purposes.

Regards,

John

Code Composer Studio™︎

Code Composer Studio forum

CCS/TMS320F280049: CCS memory allocation view unit used for C2000