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M59DR032E-ZB Datasheet(PDF) 8 Page - STMicroelectronics |
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M59DR032E-ZB Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 43 page M59DR032EA, M59DR032EB 8/43 SIGNAL DESCRIPTIONS See Figure 2, Logic Diagram, and Table 1, Signal Names, for a brief overview of the signals connect- ed to this device. Address Inputs (A0-A20). The Address Inputs select the cells in the memory array to access dur- ing Bus Read operations. During Bus Write opera- tions they control the commands sent to the Command Interface of the internal state machine. During a write operation the address inputs are latched on the falling edge of Chip Enable E or Write Enable W, whichever occurs last. Data Input/Output (DQ0-DQ15). The Data I/O output the data stored at the selected address dur- ing a Bus Read operation or input a command or the data to be programmed during a Write Bus op- eration. Both input data and commands are latched on the rising edge of Write Enable W. The data output is the Memory Array, the Common Flash Interface, the Electronic Signature Manufacturer or Device codes, the Block Protection status, the Configura- tion Register status or the Status Register Data depending on the address. The data bus is high impedance when the chip is deselected, Output Enable G is at VIH, or RP is at VIL. Chip Enable (E). The Chip Enable input acti- vates the memory control logic, input buffers, de- coders and sense amplifiers. When Chip Enable is at VIH the device is deselected and the power con- sumption is reduced to the standby level. Output Enable (G). The Output Enable gates the outputs through the data buffers during a read op- eration. When Output Enable is at VIH the outputs are high impedance. Write Enable (W). The Write Enable controls the Bus Write operation of the memory’s Command Interface. Write Protect (WP). Write Protect is an input that gives an additional hardware protection for each block. When Write Protect is at VIL, the locked-down blocks cannot be locked or unlocked. When Write Protect is at VIH, the Lock-Down is disabled and the locked-down blocks can be locked or unlocked. (refer to Table 10, Lock Sta- tus). Reset/Power-Down Input (RP). The Reset/Pow- er-Down input provides hardware reset of the memory, and/or Power-Down functions, depend- ing on the Configuration Register status. A Reset or Power-Down of the memory is achieved by pull- ing RP to VIL for at least tPLPH. The Reset/Power-Down function is set in the Con- figuration Register (see Set Configuration Regis- ter command). If it is set to ‘0’ the Reset function is enabled, if it is set to ‘1’ the Power-Down function is enabled. After a Reset or Power-Up the power save function is disabled and all blocks are locked. The memory Command Interface is reset on Pow- er Up to Read Array. Either Chip Enable or Write Enable must be tied to VIH during Power Up to al- low maximum security and the possibility to write a command on the first rising edge of Write Enable. After a Reset, when the device is in Read, Erase Suspend Read or Standby, valid data will be out- put tPHQ7V1 after the rising edge of RP. If the de- vice is in Erase or Program, the operation will be aborted and the reset recovery will take a maxi- mum of tPLQ7V. The memory will recover from Power-Down tPHQ7V2 after the rising edge of RP. See Tables 17, 18 and Figure 11. VDD and VDDQ Supply Voltage (1.65V to 2.2V). VDD provides the power supply to the internal core of the memory device. It is the main power supply for all operations (read, program and erase). VDDQ provides the power supply to the I/O pins. VDD and VDDQ must be at the same voltage. VPP Programming Voltage (11.4V to 12.6V). VPP provides a high voltage power supply for fast fac- tory programming. VPP is required to use the Dou- ble Word and Quadruple Word Program commands. VSS Ground. VSS ground is the reference for the core supply. It must be connected to the system ground. Note: Each device in a system should have VDD, VDDQ and VPP decoupled with a 0.1µF ca- pacitor close to the pin. See Figure 6, AC Mea- surement Load Circuit. The PCB trace widths should be sufficient to carry the required VPP program and erase currents. |
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