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M27W032-100M1T Folha de dados(PDF) 7 Page - STMicroelectronics |
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M27W032-100M1T Folha de dados(HTML) 7 Page - STMicroelectronics |
7 / 23 page 7/23 M27W032 BUS OPERATIONS There are six standard bus operations that control the device. These are Bus Read, Bus Write, Out- put Disable, Standby, Automatic Standby and Electronic Signature. See Tables 2, Bus Opera- tions, for a summary. Typically glitches of less than 5ns on Chip Enable or Write Enable are ig- nored by the memory and do not affect bus opera- tions. Bus Read. Bus Read operations read from the memory cells, or specific registers in the Com- mand Interface. A valid Bus Read operation in- volves setting the desired address on the Address Inputs and applying a Low signal, VIL, to Chip En- able and Output Enable. The Data Inputs/Outputs will output the value, see Figure 10, Read AC Waveforms, and Table 11, Read AC Characteris- tics, for details of when the output becomes valid. Bus Write. Bus Write operations write to the Command Interface. Bus Write is enabled only when VPP is set to VHH. A valid Bus Write opera- tion begins by setting the desired address on the Address Inputs. The Address Inputs are latched by the Command Interface on the falling edge of Chip Enable. The Data Inputs/Outputs are latched by the Command Interface on the rising edge of Chip Enable. Output Enable must remain High, VIH, during the whole Bus Write operation. See Figure 11, Write AC Waveforms, and Table 12, Write AC Characteristics, for details of the timing require- ments. Output Disable. The Data Inputs/Outputs are in the high impedance state when Output Enable is High, VIH. Standby. When Chip Enable is High, VIH, the memory enters Standby mode and the Data In- puts/Outputs pins are placed in the high-imped- ance state. To reduce the Supply Current to the Standby Supply Current, ICC2, Chip Enable should be held within VCC ± 0.2V. For the Standby current level see Table 10, DC Characteristics. During program operation the memory will contin- ue to use the Program Supply Current, ICC3, for Program operation until the operation completes. Automatic Standby. If CMOS levels (VCC ± 0.2V) are used to drive the bus and the bus is inactive for 150ns or more the memory enters Automatic Standby where the internal Supply Current is re- duced to the Standby Supply Current, ICC2. The Data Inputs/Outputs will still output data if a Bus Read operation is in progress. Electronic Signature. The memory has two codes, the manufacturer code and the device code, that can be read to identify the memory. These codes can be read by applying the signals listed in Tables 2, Bus Operations, once the Auto Select Command is executed. To exit Electronic Signature mode, the Read/Reset command must be issued. Table 2. Bus Operations Note: 1. X = VIL or VIH. 2. XX = VIL, VIH or VHH 3. When reading Status Register during Program algorithm execution VPP must be kept at VHH. Operation E G VPP Address Inputs A0-A20 Data Inputs/Outputs DQ15-DQ0 Bus Read VIL VIL XX(3) Cell Address Data Output Bus Write VIL VIH VHH Command Address Data Input Output Disable X VIH X X Hi-Z Standby VIH X X X Hi-Z Read Manufacturer Code VIL VIL VHH A0 = VIL, A1 = VIL, Others VIL or VIH 0020h Read Device Code VIL VIL VHH A0 = VIH, A1 = VIL, Others VIL or VIH 888Eh |
Nº de peça semelhante - M27W032-100M1T |
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Descrição semelhante - M27W032-100M1T |
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