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M29KW016E90M1T Datasheet(PDF) 8 Page - STMicroelectronics |
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M29KW016E90M1T Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 31 page M29KW016E 8/31 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 3, 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, applying a Low signal, VIL, to Chip Enable and Output Enable and keeping Write Enable High, VIH. The Data Inputs/Outputs will output the value, see Figure 11, Read Mode AC Waveforms, and Table 13, Read AC Characteristics, for details of when the output becomes valid. Bus Write. Bus Write operations write to the Command Interface. A valid Bus Write operation begins by setting the desired address on the Ad- dress Inputs. The Address Inputs are latched by the Command Interface on the falling edge of Chip Enable or Write Enable, whichever occurs last. The Data Inputs/Outputs are latched by the Com- mand Interface on the rising edge of Chip Enable or Write Enable, whichever occurs first. Output En- able must remain High, VIH, during the whole Bus Write operation. See Figures 12 and 13, Write AC Waveforms, and Tables 14 and 15, 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 12, DC Characteristics. During program or erase operations the memory will continue to use the Program/Erase Supply Current, ICC3, for Program or Erase operations un- til 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 3, Bus Operations. Table 3. Bus Operations Note: 1. X = VIL or VIH. 2. XX = VIL , VIH or VHH 3. Not necessary for Auto Select or Read/Reset commands. 4. When reading the Status Register during Program or Erase operations, VPP must be kept at VHH. Operation E G W VPP Address Inputs A0-A19 Data Inputs/Outputs DQ15-DQ0 Bus Read VIL VIL VIH XX(4) Cell Address Data Output Bus Write VIL VIH VIL VHH (3) Command Address Data Input Output Disable X VIH VIH X X Hi-Z Standby VIH X X X X Hi-Z Read Manufacturer Code VIL VIL VIH XX A0 = VIL, A1 = VIL, Others VIL or VIH 0020h Read Device Code VIL VIL VIH XX A0 = VIH, A1 = VIL, Others VIL or VIH 88ABh |
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