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IS61QDPB24M18A1 Datasheet(PDF) 4 Page - Integrated Silicon Solution, Inc |
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IS61QDPB24M18A1 Datasheet(HTML) 4 Page - Integrated Silicon Solution, Inc |
4 / 31 page IS61QDPB24M18A/A1/A2 IS61QDPB22M36A/A1/A2 Integrated Silicon Solution, Inc.- www.issi.com Rev. C 08/21/2014 4 SRAM Features description Block Diagram Data Register Address Register Control Logic D (Data-In) 36 (18) 20 (21) Address 4 (2) R# W# BWx# Clock Generator Doff# K K# 2M x 36 (4M x 18) Memory Array Write Driver Select Output Control Output Register 19 (20) 72 (36) 72 (36) 72 (36) 72 (36) 72 (36) 72(36) 36 (18) Q (Data-out) QVLD CQ, CQ# (Echo Clocks) 2 36 (18) QVLD CQ, CQ# (Echo Clocks) 2 Note: Numerical values in parentheses refer to the x18 device configuration. Read Operations The SRAM operates continuously in a burst-of-two mode. Read cycles are started by registering R# in active low state at the rising edge of the K clock. R# can be activated every other cycle because two full cycles are required to complete the burst of two in DDR mode. A set of free-running echo clocks, CQ and CQ#, are produced internally with timings identical to the data-outs. The echo clocks can be used as data capture clocks by the receiver device. The data corresponding to the first address is clocked two and half cycles later by the rising edge of the K# clock. The data corresponding to the second burst is clocked three cycles later by the following rising edge of the K clock. A NOP operation (R# is high) does not terminate the previous read. Write Operations Write operations can also be initiated at every rising edge of the K clock with first data whenever W# is low. The write address is provided half cycle with second data later, registered by the rising edge of K#, so the write always occurs in bursts of two. The write data is provided in a n ‘early write’ mode; that is, the data-in corresponding to the first address of the burst, is presented half cycle before the rising edge of the following K clock. The data-in corresponding to the second write burst address follows next, registered by the rising edge of K#. |
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