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AT49F4096AT-70TI Datasheet(PDF) 3 Page - ATMEL Corporation |
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AT49F4096AT-70TI Datasheet(HTML) 3 Page - ATMEL Corporation |
3 / 15 page AT49F004(T)/4096A(T) 3 AT49F004(T) Block Diagram AT49F4096A(T) Block Diagram Device Operation READ: The AT49F004(T)/4096A(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 is asserted on the outputs. The outputs are put in the high impedance state whenever CE or OE is high. This dual-line control gives designers flexibility in pre- venting bus 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). The command sequences are written by applying a low pulse on the WE or CE input with CE or WE low (respec- tively) and OE high. The address is latched on the falling edge of CE or WE, whichever occurs last. The data is latched by the first rising edge of CE or WE. Standard microprocessor write timings are used. The address loca- tions used in the command sequences are not affected by entering the command sequences. RESET: A RESET input pin is provided to ease some sys- tem applications. When RESET is at a logic high level, the V CC GND OE CONTROL LOGIC DATA INPUTS/OUTPUTS I/O0 - I/O7 DATA INPUTS/OUTPUTS I/O0 - I/O7 WE CE RESET ADDRESS INPUTS Y DECODER INPUT/OUTPUT BUFFERS INPUT/OUTPUT BUFFERS PROGRAM DATA LATCHES PROGRAM DATA LATCHES Y-GATING AT49F004 AT49F004T Y-GATING 7FFFF 7FFFF MAIN MEMORY (480K BYTES) BOOT BLOCK 16K BYTES PARAMETER BLOCK 2 8K BYTES PARAMETER BLOCK 1 8K BYTES PARAMETER BLOCK 1 8K BYTES PARAMETER BLOCK 2 8K BYTES BOOT BLOCK 16K BYTES MAIN MEMORY 480K BYTES 08000 07FFF 7C000 7BFFF 06000 05FFF 7A000 79FFF X DECODER 04000 03FFF 78000 77FFF 00000 00000 V CC GND OE CONTROL LOGIC DATA INPUTS/OUTPUTS I/O0 - I/O15 DATA INPUTS/OUTPUTS I/O0 - I/O15 WE CE RESET ADDRESS INPUTS Y DECODER INPUT/OUTPUT BUFFERS INPUT/OUTPUT BUFFERS PROGRAM DATA LATCHES PROGRAM DATA LATCHES Y-GATING AT49F4096A AT49F4096AT Y-GATING 3FFFF 3FFFF MAIN MEMORY (240K WORDS) BOOT BLOCK 8K WORDS PARAMETER BLOCK 2 4K WORDS PARAMETER BLOCK 1 4K WORDS PARAMETER BLOCK 1 4K WORDS PARAMETER BLOCK 2 4K WORDS BOOT BLOCK 8K WORDS MAIN MEMORY (240K WORDS) 04000 03FFF 3E000 3DFFF 03000 02FFF 3D000 3CFFF X DECODER 02000 01FFF 3C000 3BFFF 00000 00000 |
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