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M68AR128ML55ZB6T Datasheet(PDF) 8 Page - STMicroelectronics |
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M68AR128ML55ZB6T Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 18 page M68AR128M 8/18 OPERATION The M68AR128M has a Chip Enable power down feature which invokes an automatic standby mode whenever either Chip Enable is de-asserted (E = High) or LB and UB are de-asserted (LB and UB = High). An Output Enable (G) signal provides a high speed tri-state control, allowing fast read/ write cycles to be achieved with the common I/O data bus. Operational modes are determined by device control inputs W, E, LB and UB as summa- rized in the Operating Modes table (see Table 6). Table 6. Operating Modes Note: 1. X = VIH or VIL. Read Mode The M68AR128M is in the Read mode whenever Write Enable (W) is High with Output Enable (G) Low, and Chip Enables (E) is asserted. This pro- vides access to data from eight or sixteen, de- pending on the status of the signal UB and LB, of the 2,097,152 locations in the static memory array, specified by the 17 address inputs. Valid data will be available at the eight or sixteen output pins within tAVQV after the last stable address, provid- ing G is Low and E is Low. If Chip Enable or Output Enable access times are not met, data access will be measured from the limiting parameter (tELQV, tGLQV or tBLQV) rather than the address. Data out may be indeterminate at tELQX, tBLQX and tGLQX, but data lines will always be valid at tAVQV. Figure 7. Address Controlled, Read Mode AC Waveforms Note: E = Low, G = Low, W = High, UB = Low and/or LB = Low. Operation E W G LB UB DQ0-DQ7 DQ8-DQ15 Power Deselected VIH X X X X Hi-Z Hi-Z Standby (ISB) Deselected X X X VIH VIH Hi-Z Hi-Z Standby (ISB) Lower Byte Read VIL VIH VIL VIL VIH Data Output Hi-Z Active (ICC) Lower Byte Write VIL VIL X VIL VIH Data Input Hi-Z Active (ICC) Output Disabled VIL VIH VIH X X Hi-Z Hi-Z Active (ICC) Upper Byte Read VIL VIH VIL VIH VIL Hi-Z Data Output Active (ICC) Upper Byte Write VIL VIL X VIH VIL Hi-Z Data Input Active (ICC) Word Read VIL VIH VIL VIL VIL Data Output Data Output Active (ICC) Word Write VIL VIL X VIL VIL Data Input Data Input Active (ICC) AI03923 tAVAV tAVQV tAXQX A0-A16 DQ0-DQ7 and/or DQ8-DQ15 VALID DATA VALID |
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