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MM24256-BWMN6T Datasheet(PDF) 7 Page - STMicroelectronics |
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MM24256-BWMN6T Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 17 page 7/17 M24256, M24128 During the internal write cycle, the SDA input is disabled internally, and the device does not re- spond to any requests. Minimizing System Delays by Polling On ACK During the internal write cycle, the memory discon- nects itself from the bus, and copies the data from its internal latches to the memory cells. The maxi- mum write time (tw) is shown in Table 10, but the typical time is shorter. To make use of this, an Ack polling sequence can be used by the master. The sequence, as shown in Figure 7, is: – Initial condition: a Write is in progress. – Step 1: the master issues a START condition followed by a Device Select Code (the first byte of the new instruction). – Step 2: if the memory is busy with the internal write cycle, no Ack will be returned and the mas- ter goes back to Step 1. If the memory has ter- will fit up to the end of the row, a condition known as ‘roll-over’ occurs. Data starts to become over- written (in a way not formally specified in this data sheet). The master sends from one up to 64 bytes of data, each of which is acknowledged by the memory if the WC pin is low. If the WC pin is high, the con- tents of the addressed memory location are not modified, and each data byte is followed by a NoAck. After each byte is transferred, the internal byte address counter (the 6 least significant bits only) is incremented. The transfer is terminated by the master generating a STOP condition. When the master generates a STOP condition im- mediately after the Ack bit (in the “10th bit” time slot), either at the end of a byte write or a page write, the internal memory write cycle is triggered. A STOP condition at any other time does not trig- ger the internal write cycle. Figure 7. Write Cycle Polling Flowchart using ACK WRITE Cycle in Progress AI01847C Next Operation is Addressing the Memory START Condition DEVICE SELECT with RW = 0 ACK Returned YES NO YES NO ReSTART STOP DATA for the WRITE Operation DEVICE SELECT with RW = 1 Send Address and Receive ACK First byte of instruction with RW = 0 already decoded by the device YES NO START Condition Continue the WRITE Operation Continue the Random READ Operation |
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