how to use a FIFO block in simulink with some specifications?

I am trying to convert a synchronous data flow graph into a synchronous block diagram in simulink..! Specifications

-I have 2 blocks A and B with a FIFO in between them for buffer.

-FIFO register size 4

Process

-If there is free space of 2(register size) in FIFO, A will fire (or) produce 2 tokens at the head of FIFO.

-If there is 3 available tokens at the tail of FIFO, B will consume 3 tokens at the tail of FIFO.

Like this i want to form a producer consumer model in simulink with FIFO in the middle.

if my question is nt clear.. pls let me know Any ideas pls lets discuss!!

Thank you

[Azzi Abdelmalek]

duplicate question in http://www.mathworks.com/matlabcentral/answers/47652-fifo-block-in-simulink

[Rahul kumar]

so do i want to delete any one of the question..! sorry i dono the rules of the forum

[Azzi Abdelmalek]

if you want to update your question, just add a comment. but if there are no answers,I think there are maby many reasons,

1. we have 'n t the answer
2. the qustion is'nt clear
3. ...

[Oleg Komarov]

I deleted the duplicate question.