Systems, methods, and apparatus for pixel fetch request interface

1. A memory access unit for accessing data for a module, said memory access unit comprising:

an input port for receiving request for blocks of pixels from a motion prediction processing unit; and

an output port for providing access requests for lists of addresses in a memory over a link to a memory controller.

2. The memory access unit of claim 1 , further comprising:

logic for generating the lists of addresses from the requests for blocks of pixels, wherein the lists of addresses correspond to addresses in a memory that store pixels in the blocks of pixels.

3. The memory access unit of claim 1 , wherein the memory access unit receives data stored at the addresses in the memory from the lists of addresses in the memory over a bus shared with one or more clients.

4. The memory access unit of claim 1 , wherein the addresses are non-contiguous.

5. The memory access unit of claim 1 , wherein the memory access unit receives data stored at the addresses in the memory from the lists of addresses in the memory over said link.

6. A memory controller for accessing a memory, said memory controller comprising:

a port for receiving access requests for lists of addresses in a memory over a link from a client;

another port for receiving requests for accessing the memory over a shared bus from one or more other clients; and

a queue for queuing the access requests for lists of addresses, wherein the queue orders the addresses in a different order than the addresses are requested.

7. The memory controller of claim 6 , further comprising:

an arbiter for arbitrating between the requests for lists of addresses from the client and the requests for accessing the memory from the one or more other clients.

8. The memory controller of claim 6 , wherein the memory controller transmits data stored at the addresses in the memory from the lists of addresses in the memory over the another port.

9. The memory controller of claim 6 , wherein the memory controller transmits data stored at the addresses in the memory from the lists of addresses in the memory over the said port.

10. A system for processing video data, said system comprising:

a memory access unit for receiving requests for blocks of pixels and generating requests to access lists of addresses in a memory;

a memory controller for receiving the requests to access the lists of addresses in the memory;

a link connecting the memory access unit and the memory controller for providing the requests to access the lists of addresses in the memory;

one or more clients for performing one or more functions; and

a bus for providing access requests from the one or more clients, wherein the bus provides access requests from the addresses in a different order than the requests for addresses in the list were generated.

11. The system of claim 10 , wherein the bus provides data stored at the addresses in the memory from the lists of addresses in the memory to the memory access unit.

12. The system of claim 10 , wherein the link provides the data stored at the addresses in the memory from the lists of addresses in the memory to the memory access unit.

13. The system of claim 10 , further comprising:

a motion prediction processor for producing predicted pixels from the blocks of pixels.

14. The system of claim 10 , wherein the memory access unit further comprises:

logic for generating the lists of addresses from the requests for blocks of pixels, wherein the lists of addresses correspond to addresses in a memory that store pixels in the blocks of pixels.

15. The system of claim 14 , wherein the logic orders the lists so that addresses referring to a same row of a memory bank are ordered in an order to be a common transaction.

16. The system of claim 10 , wherein the memory access unit further comprises:

a queue for queuing the requests for the lists of addresses.

17. The system of claim 10 , wherein the memory controller further comprises:

an arbiter for arbitrating the requests to access the lists of addresses in the memory that are received over the bus, and the requests to access the lists of addresses in the memory over the link.

18. The system of claim 10 , further comprising:

a link coupling the memory access unit and the memory controller for providing the requests to access the lists of addresses in the memory.

19. The system of claim 10 , further comprising:

one or more clients for performing one or more functions; and

a bus for providing requests for the blocks of pixels from the one or more clients.