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GS8150V18AGB-333 Datasheet(PDF) 4 Page - GSI Technology |
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GS8150V18AGB-333 Datasheet(HTML) 4 Page - GSI Technology |
4 / 25 page GS8150V18/36AB-357/333/300/250 Product Preview Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. Rev: 1.04 4/2005 4/25 © 2003, GSI Technology GS8150V18/36 BGA Pin Description Symbol Type Description A I Address Inputs DQA DQB DQC DQD I/O Data Input and Output pins BA, BB, BC, BD I Byte Write Enable for DQA, DQB, DQC, DQD I/Os; active low NC — No Connect CK I Clock Input Signal; active high CK I Clock Input Signal; active low SW I Write Enable; active low G I Output Enable; active low ZZ I Sleep mode control; active high M1 I Read Operation Protocol Select—Selects Register-Register read operations; must be tied low in this device M2 I Read Operation Protocol Select—Selects Register-Register read operations; must be tied high in this device ZQ I FLXDrive-II™ Output Impedance Control SS I Synchronous Select Input TMS I Scan Test Mode Select TDI I Scan Test Data In TDO O Scan Test Data Out TCK I Scan Test Clock VREF I Input Reference Voltage VDD I Core power supply VSS I I/O and Core Ground VDDQ I Output driver power supply Read Operations Pipelined Read A read cycle begins when the RAM captures logic 0 on SS and logic 1 on SW at the rising edge of K (and the falling edge of K). Address inputs captured on that clock edge are propigated into the RAM, which delivers data to the input of the output registers. The second rising edge of K fires the output registers and releases read data to the output drivers. If G is held active low, the drivers drive the data onto the output pins. Read data is sustained on the output pins as long as G is held low or until the next rising edge of K, at which point the outputs may update to new data or deselect, depending on what control command was registered at the second rising edge of K. Dual Cycle Deselect Chip deselect (SS = logic 1) is pipelined to the same degree as read data. Therefore, a deselect command entered on the rising edge of K is acted upon in response to the next rising edge of K. |
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