Difference between revisions of "Mcontr"

Latest revision as of 09:49, 18 September 2008

Description

FPGA module that controls reads and writes between FPGA and DDR SDRAM (boards 10353 & 10359).

Fig.1 Mcontr functional scheme

Bank interleaving

• Taken from Theora's code.
• Banks addresses (SDA[14:13]) and order used in a single memory access: 00&10, 11&01, 10&00, 01&11.
• Both banks are opened in the beginning of the sequence.
• Write/read sequence is divided by 2 and all column addresses are the same.
• Row address of the second bank in a sequence is the first bank's + 1.

Fig.2 Bank interleaving example

Programmable SDRAM sequence

Programmable:

• sequence length
• tile length in column(x4 banks)
• tile width in rows
• address shift in a column for a new tile
• address shift in a row for a new tile
• maximum number of tiles in a column
• maximum number of tiles in a row

TODO

• bank interleaving
• run-time programmable SDRAM sequencing