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GS882Z18B-66 Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers |
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GS882Z18B-66 Datasheet(HTML) 6 Page - List of Unclassifed Manufacturers |
6 / 34 page Rev: 1.15 6/2001 6/34 © 1998, Giga Semiconductor, Inc. Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com Preliminary. GS882Z18/36B-11/100/80/66 The Byte Write Enable inputs (BA, BB, BC, and BD) determine which bytes will be written. All or none may be activated. A Write Cycle with no Byte Write inputs active is a no-op cycle. The pipelined NBT SRAM provides double late write functionality, matching the write command versus data pipeline length (2 cycles) to the read command versus data pipeline length (2 cycles). At the first rising edge of clock, Enable, Write, Byte Write(s), and Address are registered. The Data In associated with that address is required at the third rising edge of clock. Flow Through Mode Read and Write Operations Operation of the RAM in Flow Through mode is very similar to operations in Pipeline mode. Activation of a Read Cycle and the use of the Burst Address Counter is identical. In Flow Through mode the device may begin driving out new data immediately after new address are clocked into the RAM, rather than holding new data until the following (second) clock edge. Therefore, in Flow Through mode the read pipeline is one cycle shorter than in Pipeline mode. Write operations are initiated in the same way as well, but differ in that the write pipeline is one cycle shorter, preserving the ability to turn the bus from reads to writes without inserting any dead cycles. While the pipelined NBT RAMs implement a double late write protocol, in Flow Through mode a single late write protocol mode is observed. Therefore, in Flow Through mode, address and control are registered on the first rising edge of clock and data in is required at the data input pins at the second rising edge of clock. |
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