EM68932DVKB datasheet(8/40 Pages) ETRON

8 / 40 page

EtronTech

EM68932DVKB

Etron Confidential

Rev. 1.0

Aug. 2009

Burst Mode Operation

Burst Mode operation is used to provide a constant flow of data to memory locations (write cycle) or from

memory locations (read cycle). There are two parameters that define how the Burst Mode operates.

These parameters include Burst Type and Burst Length and are programmed by addresses A0~A3 during

the Mode Register Set command. Burst Type is used to define the sequence in which the burst data will

be delivered from or stored to the DDR SDRAM. Two types of burst sequences are supported, Sequential

and Interleaved. See the table below. The Burst Length controls the number of bits that will be output after

a read command, or the number of bits to be input after a write command. The Burst Length can be

programmed to have a value of 2, 4, or 8.

Table 5.Burst Definition

Start Address

Burst

Length

Sequential

Interleave

0,1

1,0

0, 1, 2, 3

1, 2, 3, 0

1, 0, 3, 2

2, 3, 0, 1

3, 0, 1, 2

3, 2, 1, 0

0, 1, 2, 3, 4, 5, 6, 7

1, 2, 3,4, 5, 6, 7, 0

1, 0, 3, 2, 5, 4, 7, 6

2, 3, 4, 5, 6, 7, 0, 1

2, 3, 0, 1, 6, 7, 4, 5

3, 4, 5, 6, 7, 0, 1, 2

3, 2, 1, 0, 7, 6, 5, 4

4, 5, 6, 7, 0, 1, 2, 3

5, 6, 7, 0, 1, 2, 3, 4

5, 4, 7, 6, 1, 0, 3, 2

6, 7, 0, 1, 2, 3, 4, 5

6, 7, 4, 5, 2, 3, 0, 1

7, 0, 1, 2, 3, 4, 5, 6

7, 6, 5, 4, 3, 2, 1, 0

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