Lpc2000

--- In lpc2000@yahoogroups.com, "Manisha" <manisha@...> wrote:
>
> Hi all,
> 
> i am confused with the words and byte relation in EP_RAM size. they are
> saying EP_RAM is word aligned. and FIFO maximum size is in bytes, so, we
> will have to align the allocation.
> 
> however, they ary making it as EP_RAMsize=(Maxpacketsize + 3) / 4 +
1, in
> this are they taking 1 word=4 bytes? but as i know 1 word, in most
cases we
> define as 2 bytes and DWORD 4 bytes.
> 
> Thanks for going through the problem.
> 
> if anyone has any idea please help me.
> 
> Regards
> Manisha.
> 
> 

DWORD is kind of an Intel thing.  I don't see it described in the GNU
manuals (other than under FRV) so if it applies to ARM at all, it is
compiler vendor specific.

The ARM word is 32 bits - it is not 2-16 bit entities treated as a 32
bit entity as it was in the early Intel chips.  Two signed or unsigned
16 bit integers can be packed in a 32 bit word as can four signed or
unsigned bytes.

Richard