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AM28F512A-200PEB Datasheet(PDF) 10 Page - Advanced Micro Devices |
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AM28F512A-200PEB Datasheet(HTML) 10 Page - Advanced Micro Devices |
10 / 34 page 10 Am28F512A READ-ONLY MODE When VPP is less than VCC + 2 V, the command register is inactive. The device can either read array or autose- lect data, or be standby mode. Read The device functions as a read only memory when VPP < VCC + 2 V. The device has two control functions. Both must be satisfied in order to output data. CE# controls power to the device. This pin should be used for spe- cific device selection. OE# controls the device outputs and should be used to gate data to the output pins if a device is selected. Address access time tACC is equal to the delay from stable addresses to valid output data. The chip enable access time tCE is the delay from stable addresses and stable CE# to valid data at the output pins. The output enable access time is the delay from the falling edge of OE# to valid data at the output pins (assuming the ad- dresses have been stable at least tACC - tOE). Standby Mode The device has two standby modes. The CMOS standby mode (CE# input held at VCC ± 0.5 V), con- sumes less than 100 µA of current. TTL standby mode (CE# is held at VIH) reduces the current requirements to less than 1 mA. When in the standby mode the out- puts are in a high impedance state, independent of the OE# input. If the device is deselected during erasure, program- ming, or program/erase verification, the device will draw active current until the operation is terminated. Output Disable Output from the device is disabled when OE# is at a logic high level. When disabled, output pins are in a high impedance state. Auto Select Flash memories can be programmed in-system or in a standard PROM programmer. The device may be sol- dered to the circuit board upon receipt of shipment and programmed in-system. Alternatively, the device may initially be programmed in a PROM programmer prior to soldering the device to the board. The Auto select mode allows the reading out of a binary code from the device that will identify its manufacturer and type. This mode is intended for the purpose of automati- cally matching the device to be programmed with its cor- responding programming algorithm. This mode is functional over the entire temperature range of the device. Programming In A PROM Programmer To activate this mode, the programming equipment must force VID (11.5 V to 13.0 V) on address A9. Two identifier bytes may then be sequenced from the device outputs by toggling address A0 from VIL to VIH. All other address lines must be held at VIL, and VPP must be less than or equal to VCC + 2.0 V while using this Auto select mode. Byte 0 (A0 = VIL) represents the manufac- turer code and byte 1 (A0 = VIH) the device identifier code. For the device the two bytes are given in the table 2 of the device data sheet. All identifiers for manufac- turer and device codes will exhibit odd parity with the MSB (DQ7) defined as the parity bit. Table 2. Am28F512A Auto Select Code Type A0 Code (HEX) Manufacturer Code VIL 01 Device Code VIH AE |
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