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Uneven 16-bit reads from IWRAM and EWRAM   Message List  
Reply | Forward Message #11630 of 15019 |
Hi all,

Has anyone here timed 16-bit reads from IWRAM and EWRAM on a real GBA?
Are reads from odd addresses just as fast as those from even addresses?
--
Cheers,
James.

/\ apex James Daniels
//\\ designs james.daniels@...
//__\\ http://www.apex-designs.net
Sat Jun 1, 2002 8:17 pm

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j_r_daniels
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Forward 		Message #11630 of 15019 |
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Hi all, Has anyone here timed 16-bit reads from IWRAM and EWRAM on a real GBA? Are reads from odd addresses just as fast as those from even addresses? -- ... 		James Daniels
j_r_daniels
Offline Send Email 		Jun 1, 2002
8:26 pm

... I interpret "even" to mean "4n" and "odd" as "4n + 2". Reads from "odd" addresses from IWRAM should not be any different than reads from "even" addresses...
yerricde
Offline Send Email 		Jun 2, 2002
12:15 am

Hi yerricde, ... I meant odd and even in the traditional sense - i.e. an even address is exactly divisible by 2 (2n) whereas an odd address is not (2n+1). ... ...
James Daniels
j_r_daniels
Offline Send Email 		Jun 2, 2002
1:04 am

... You should, as a read from an odd (4n + c where 1 <= c <= 3) address is merely a read from 4n followed by a rotation. However, note that unlike on x86,...
yerricde
Offline Send Email 		Jun 2, 2002
10:23 am

From: "James Daniels" <james.daniels@...> ... You can only perform 8-bit reads on odd addresses. 16-bit reads must be on 16-bit boundaries....
John Seghers
johnse98072
Offline Send Email 		Jun 2, 2002
10:23 am
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