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IS43R16320A Datasheet(PDF) 4 Page - Integrated Silicon Solution, Inc |
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IS43R16320A Datasheet(HTML) 4 Page - Integrated Silicon Solution, Inc |
4 / 18 page 4 Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 03/22/06 ISSI® IS43R16320A Notes: 1. For a burst length of two, A1-A i selects the two-data-element block; A0 selects the first access within the block. 2. For a burst length of four, A2-A i selects the four-data-element block; A0-A1 selects the first access within the block. 3. For a burst length of eight, A3-A i selects the eight-data- element block; A0-A2 selects the first access within the block. 4. Whenever a boundary of the block is reached within a given sequence above, the following access wraps within the block. Burst Type Accesses within a given burst may be programmed to be either sequential or interleaved; this is referred to as the burst type and is selected via bit A3. The ordering of accesses within a burst is determined by the burst length, the burst type and the start- ing column address, as shown in Burst Definition. Read Latency The Read latency, or CAS latency, is the delay, in clock cycles, between the registration of a Read command and the availability of the first burst of output data. The latency can be programmed 2 or 2.5 clocks for DDR333. If a Read command is registered at clock edge n, and the latency is m clocks, the data is available nominally coincident with clock edge n + m. Reserved states should not be used as unknown operation or incompatibility with future versions may result. Burst Definition Burst Length Starting Column Address Order of Accesses Within a Burst A2 A1 A0 Type = Sequential Type = Interleaved 2 0 0-1 0-1 11-0 1-0 4 0 0 0-1-2-3 0-1-2-3 0 1 1-2-3-0 1-0-3-2 1 0 2-3-0-1 2-3-0-1 1 1 3-0-1-2 3-2-1-0 8 0 0 0 0-1-2-3-4-5-6-7 0-1-2-3-4-5-6-7 0 0 1 1-2-3-4-5-6-7-0 1-0-3-2-5-4-7-6 0 1 0 2-3-4-5-6-7-0-1 2-3-0-1-6-7-4-5 0 1 1 3-4-5-6-7-0-1-2 3-2-1-0-7-6-5-4 1 0 0 4-5-6-7-0-1-2-3 4-5-6-7-0-1-2-3 1 0 1 5-6-7-0-1-2-3-4 5-4-7-6-1-0-3-2 1 1 0 6-7-0-1-2-3-4-5 6-7-4-5-2-3-0-1 1 1 1 7-0-1-2-3-4-5-6 7-6-5-4-3-2-1-0 |
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