[Mp4-tech] [Question] About H.264's Macroblock Memory implementation

[Carter]

HI. 
I'm working on the paper about "A Hardware Accelerator for Context-Based Adaptive
Binary Arithmetic Decoding in H.264/AVC1" 
0-7803-8834-8 
and i will implementation H/W about CABAC decode in H.264. 
I have some Question in the paper about H.264's Macroblock Memory implementation 
In paper section "B. Memory System" 
Could you please help me ? 
Q1. At the paper in "B memory System" section 
Why the CABAC decoder start fistly to decode the twenty-fifth macroblock(A25)? 
Is this right? i think that the CABAC decoder start fistly to decode the first macroblock(A1)? 
Q2. At the same section " B memory system" section 
In the paper written that Motion compensation subsystem and intra prediction subsystem can read macroblocks A1,A2, and A23 from M1,M2, M23 respectively, of the macroblock memory after CABAC decoder finished reading and writing memory. Why A1,A2 and A23 ?  how? 
Q3. What information save to Macroblock memory (M1~M24)? 
Q4. Why seperate two part about READ/WRITE? 
please help me. 
regard 
Carter 
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