EtronTech
Burst Mode Operation
EM68932DVKB
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
Burst
Length
2
Start Address
A3 A2 A1 A0
X
X
X
0
X
X
X
1
X
X
0
0
X
X
0
1
X
X
1
0
X
X
1
1
X
0
0
0
X
0
0
1
X
0
1
0
X
0
1
1
X
1
0
0
X
1
0
1
X
1
1
0
X
1
1
1
Sequential
0,1
1,0
0, 1, 2, 3
1, 2, 3, 0
2, 3, 0, 1
3, 0, 1, 2
0, 1, 2, 3, 4, 5, 6, 7
1, 2, 3,4, 5, 6, 7, 0
2, 3, 4, 5, 6, 7, 0, 1
3, 4, 5, 6, 7, 0, 1, 2
4, 5, 6, 7, 0, 1, 2, 3
5, 6, 7, 0, 1, 2, 3, 4
6, 7, 0, 1, 2, 3, 4, 5
7, 0, 1, 2, 3, 4, 5, 6
Interleave
0,1
1,0
0, 1, 2, 3
1, 0, 3, 2
2, 3, 0, 1
3, 2, 1, 0
0, 1, 2, 3, 4, 5, 6, 7
1, 0, 3, 2, 5, 4, 7, 6
2, 3, 0, 1, 6, 7, 4, 5
3, 2, 1, 0, 7, 6, 5, 4
4, 5, 6, 7, 0, 1, 2, 3
5, 4, 7, 6, 1, 0, 3, 2
6, 7, 4, 5, 2, 3, 0, 1
7, 6, 5, 4, 3, 2, 1, 0
4
8
Etron Confidential
8
Rev. 1.0
Aug. 2009
ETRON [ ETRON TECHNOLOGY, INC. ]
