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M28C16-25WBS6 Datasheet(PDF) 4 Page - STMicroelectronics |
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M28C16-25WBS6 Datasheet(HTML) 4 Page - STMicroelectronics |
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4 / 19 page  AI01520 ADDRESS LATCH A6-A10 (Page Address) CONTROL LOGIC 64K ARRAY ADDRESS LATCH A0-A5 Y DECODE VPP GEN RESET SENSE AND DATA LATCH I/O BUFFERS EG W PAGE LOAD TIMER STATUS TOGGLE BIT DATA POLLING DQ0-DQ7 Figure 3. Block Diagram Write Write operations are initiated when both W and E are low and G is high.The M28C16A/17Asupports both E and W controlled write cycles. The Address is latched by the falling edge of E or W which ever occurs last and the Data on the rising edge of E or W which ever occurs first. Once initiated the write operation is internally timed until completion. Page Write Page write allows up to 32 bytes to be consecu- tively latched into the memory prior to initiating a DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0 DP TB PLTS Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z Figure 4. Status Bit Assignment DP = Data Polling TB = Toggle Bit PLTS = Page Load Timer Status programming cycle. All bytes must be located in a single page address, that is A5 - A10 must be the same for all bytes. The page write can be initiated during any byte write operation. Following the first byte write instruction the host may send another address and data up to a maxi- mum of tWHWH after the rising edge of E or W which ever occurs first. If a transition of E or W is not detected within tWHWH, the internal programming cycle will start. Microcontroller Control Interface The M28C16A/17A provides two write operation status bits and one status pin that can be used to minimize the system write cycle. These signals are available on the I/O port bits DQ7 or DQ6 of the memory during programming cycle only, or as the RB signal on a separate pin. Data Polling bit (DQ7). During the internal write cycle, any attempt to read the last byte written will produce on DQ7 the complementary value of the previously latched bit. Once the write cycle is fin- ished the true logic value appears on DQ7 in the read cycle. OPERATION (cont’d) 4/19 M28C16A, M28C17A |
Similar Part No. - M28C16-25WBS6 |
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Similar Description - M28C16-25WBS6 |
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