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GS8182D19BD-400I 数据表(PDF) 5 Page - GSI Technology |
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GS8182D19BD-400I 数据表(HTML) 5 Page - GSI Technology |
5 / 27 page GS8182D19/37BD-435/400/375/333/300 Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. Rev: 1.03a 11/2011 5/27 © 2008, GSI Technology Background Separate I/O SRAMs, from a system architecture point of view, are attractive in applications where alternating reads and writes are needed. Therefore, the SigmaQuad-II+ SRAM interface and truth table are optimized for alternating reads and writes. Separate I/O SRAMs are unpopular in applications where multiple reads or multiple writes are needed because burst read or write transfers from Separate I/O SRAMs can cut the RAM’s bandwidth in half. SigmaQuad-II+ B4 SRAM DDR Read The status of the Address Input, W, and R pins are sampled by the rising edges of K. W and R high causes chip disable. A low on the Read Enable-bar pin, R, begins a read cycle. R is always ignored if the previous command loaded was a read command. . Clocking in a high on the Read Enable-bar pin, R, begins a read port deselect cycle. SigmaQuad-II+ B4 SRAM DDR Write The status of the Address Input, W, and R pins are sampled by the rising edges of K. W and R high causes chip disable. A low on the Write Enable-bar pin, W, and a high on the Read Enable-bar pin, R, begins a write cycle. W is always ignored if the previous command was a write command. Data is clocked in by the next rising edge of K, the rising edge of K after that, the next rising edge of K, and finally by the next rising edge of K. and by the rising edge of the K that follows. |
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类似说明 - GS8182D19BD-400I |
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