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AT49BV1604-90UC Datasheet(PDF) 3 Page - ATMEL Corporation |
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AT49BV1604-90UC Datasheet(HTML) 3 Page - ATMEL Corporation |
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3 / 18 page  AT49BV1604(T)/1614(T) 3 A VPP pin is provided to improve program/erase times. This pin can be tied to VCC. To take advantage of faster pro- gramming and erasing, the pin should supply 4.5 to 5.5 volts during program and erase operations. A six byte command (bypass unlock) sequence to remove th e req uirem ent of ente ri ng the three byte prog ra m sequence is offered to further improve programming time. After entering the six byte code, only single pulses on the write control lines are required for writing into the device. This mode (single pulse byte/word program) is exited by powering down the device, or by pulsing the RESET pin low for a minimum of 50 ns and then bringing it back to V CC. Erase and Erase Suspend/Resume commands will not work while in this mode; if entered they will result in data being programmed into the device. It is not recommended that the six byte code reside in the software of the final product but only exist in external programming code. For the AT49BV1614(T), the BYTE pin controls whether the device data I/O pins operate in the byte or word config- uration. If the BYTE pin is set at logic “1”, the device is in word configuration, I/O0-I/O15 are active and controlled by CE and OE. If the BYTE pin is set at logic “0”, the device is in byte con- figuration, and only data I/O pins I/O0 - I/O7 are active and controlled by CE and OE. The data I/O pins I/O8 - I/O14 are tri-stated, and the I/O15 pin is used as an input for the LSB (A-1) address function. Block Diagram Device Operation READ: The AT49BV16X4(T) is accessed like an EPROM. When CE and OE are low and WE is high, the data stored at the memory location determined by the address pins are asserted on the outputs. The outputs are put in the high impedance state whenever CE or OE is high. This dual-line contro l gives design ers flexib ility in preventing bu s contention. COMMAND SEQUENCES: When the device is first pow- ered on it will be reset to the read or standby mode depending upon the state of the control line inputs. In order to perform other device functions, a series of command sequences are entered into the device. The command sequences are shown in the Command Definitions table (I/O8 - I/O15 are don't care inputs for the command codes). IDENTIFIER REGISTER STATUS REGISTER DATA COMPARATOR OUTPUT BUFFER INPUT BUFFER COMMAND REGISTER Y-GATING WRITE STATE MACHINE PROGRAM/ERASE VOLTAGE SWITCH CE WE OE RESET BYTE RDY/BUSY VPP VCC GND Y-DECODER X-DECODER INPUT BUFFER ADDRESS LATCH I/O0 - I/O15/A-1 A0 - A19 PLANE B SECTORS PLANE A SECTORS |
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