IS43DR32800A-37CBLI-TR ISSI, IS43DR32800A-37CBLI-TR Datasheet - Page 31

• Manufacturer Part Number: IS43DR32800A-37CBLI-TR
• Description: DRAM 256M (8Mx32) 266MHz DDR2 1.8v
• Manufacturer: ISSI

Specifications of IS43DR32800A-37CBLI-TR

• Product Category: DRAM
• Rohs: yes
• Factory Pack Quantity: 1500

IS43DR32800A, IS43/46DR32801A
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). The parameters that define how the burst mode will operate are burst sequence and burst
length. DDR2 SDRAM supports 4 bit burst and 8 bit burst modes only. For 8 bit burst mode, full interleave address
ordering is supported, however, sequential address ordering is nibble based for ease of implementation. The burst
type, either sequential or interleaved, is programmable and defined by MR[A3], which is similar to the DDR SDRAM
operation. Seamless burst read or write operations are supported. Unlike DDR devices, interruption of a burst read or
write cycle during BL = 4 mode operation is prohibited. However in case of BL = 8 mode, interruption of a burst read or
write operation is limited to two cases, reads interrupted by a read, or writes interrupted by a write. Therefore the Burst
Stop command is not supported on DDR2 SDRAM devices.
Burst Length and Sequence
Integrated Silicon Solution, Inc. — www.issi.com
Rev. 00E
09/08/2010
Burst Length Starting Address (A1, A0)
Burst Length Starting Address (A2, A1, A0) Sequential Addressing (decimal)
4
8
0 0
0 1
1 0
1 1
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
Sequential Addressing (decimal)
0, 1, 2, 3, 4, 5, 6, 7
1, 2, 3, 0, 5, 6, 7, 4
2, 3, 0, 1, 6, 7, 4, 5
3, 0, 1, 2, 7, 4, 5, 6
4, 5, 6, 7, 0, 1, 2, 3
5, 6, 7, 4, 1, 2, 3, 0
6, 7, 4, 5, 2, 3, 0, 1
7, 4, 5, 6, 3, 0, 1, 2
0, 1, 2, 3
1, 2, 3, 0
2, 3, 0, 1
3, 0, 1, 2
Interleave Addressing (decimal)
Interleave Addressing (decimal)
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
0, 1, 2, 3
1, 0, 3, 2
2, 3, 0, 1
3, 2, 1, 0
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