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M69AW024B Datasheet(PDF) 6 Page - STMicroelectronics |
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M69AW024B Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 29 page M69AW024B 6/29 SIGNAL DESCRIPTIONS See Figure 2., Logic Diagram, and Table 1., Signal Names, for a brief overview of the sig- nals connected to this device. Address Inputs (A0-A19). The Address Inputs select the cells in the memory array to access dur- ing Read and Write operations. Data Inputs/Outputs (DQ8-DQ15). The Upper Byte Data Inputs/Outputs carry the data to or from the upper part of the selected address during a Write or Read operation, when Upper Byte Enable (UB) is driven Low. Data Inputs/Outputs (DQ0-DQ7). The Lower Byte Data Inputs/Outputs carry the data to or from the lower part of the selected address during a Write or Read operation, when Lower Byte Enable (LB) is driven Low. Chip Enable (E1). When asserted (Low), the Chip Enable, E1, activates the memory state ma- chine, address buffers and decoders, allowing Read and Write operations to be performed. When de-asserted (High), all other pins are ignored, and the device is put, automatically, in low-power Standby mode. Chip Enable (E2). The Chip Enable, E2, puts the device in Deep Power-down mode when it is driven Low. This is the lowest power mode. Output Enable (G). The Output Enable, G, pro- vides a high speed tri-state control, allowing fast read/write cycles to be achieved with the common I/O data bus. Write Enable (W). The Write Enable, W, controls the Bus Write operation of the memory. Upper Byte Enable (UB). The Upper Byte En- able, UB, gates the data on the Upper Byte Data Inputs/Outputs (DQ8-DQ15) to or from the upper part of the selected address during a Write or Read operation. Lower Byte Enable (LB). The Lower Byte En- able, LB, gates the data on the Lower Byte Data Inputs/Outputs (DQ0-DQ7) to or from the lower part of the selected address during a Write or Read operation. VCC Supply Voltage. The VCC Supply Voltage supplies the power for all operations (Read or Write) and for driving the refresh logic, even when the device is not being accessed. VSS Ground. The VSS Ground is the reference for all voltage measurements. |
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