About Memeory Budget

Hello,
In CLDC 1.1:

The CLDC Specification assumes that:
■ At least 160 kilobytes of non-volatile1 memory
machine and CLDC libraries.
■ At least 32 kilobytes of volatile memory2
runtime (for example, the object heap.)

In MIDP 2.0:

256 kilobytes of non-volatile memory for the MIDP implementation, beyond what's required for CLDC.
8 kilobytes of non-volatile memory for application-created persistent data
128 kilobytes of volatile memory for the Java runtime (e.g., the Java heap)

Does this means that for a MID that implements cldc1.1+midp2.0 will at least have:

160k+256K non-volatile memory and
8 + 128 k volatile memory

right?

No.

MIDP 2.0 and CLDC 1.0/1.1 are complimentary, not additive, requirements. MIDP 2.0 requires CLDC 1.0 or 1.1, and so the MIDP 2.0 requirements are in lieu of those required for the CLDC.

"non-volatile memory for application-created persistent data"
refers to RMS storage size.

So:
Min non-volatile memory : 160k fou CLDC, 256k for MIDP, 8k for RMS
Min volatile memory: 128 k volatile memory

I still has not read JTWI so it's only mean for CLDC + MIDP.

Originally posted by Song Lixin:
So:
Min non-volatile memory : 160k fou CLDC, 256k for MIDP, 8k for RMS
Min volatile memory: 128 k volatile memory

I still has not read JTWI so it's only mean for CLDC + MIDP.

JTWI is just a specification to "standardize" how CLDC and MIDP and other Java ME technologies are implemented in the mobile industry.

(Basically, in other words, any JTWI-compliant device should have at least 256k of non-volatile memory and 128k of volatile, etc., since MIDP enhances CLDC's requirements...)

Hi Song,
The memory information are just for the implementers to follow while they are implementating a device. In the other words, those limits must be satisfied when someone claims that their implementation is CLDC1.1- or MIDP2.0-compliant.

But they are a must for an exam taker to know.

Thx a lot! All!
I have read all the spec and APIs and also Sathy's notes.

I will take the exam soon.