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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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M34S32 Scheda tecnica(PDF) 11 Page - STMicroelectronics |
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M34S32 Scheda tecnica(HTML) 11 Page - STMicroelectronics |
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11 / 18 page  M34S32 11/18 Example of an incorrect sequence, disabling the Write in the OTP page: Start 1010 0010 (OTP page select code) Ack xxxx 0000 (MSB address) Ack 0000 0100 (incorrect LSB address) Ack (acknowledged, but...) 0100 1101 (the attempts at) (no ack) (writing data to the) 1100 1010 (OTP page are) (no ack) (not acknowledged) 0101 0011 (no ack) Stop Figure 10. Write Modes Sequence with WC = 0 and WCpol = 0 Note: 1. The device has the same behavior when WC = 1 and WCpol = 1. BYTE WRITE DEV SEL BYTE ADDR BYTE ADDR DATA IN WC PAGE WRITE DEV SEL BYTE ADDR BYTE ADDR DATA IN 1 WC DATA IN 2 AI01106B PAGE WRITE (cont'd) WC (cont'd) DATA IN N ACK R/W ACK ACK ACK ACK ACK ACK ACK R/W ACK ACK Minimizing System Delay by Polling On ACK. During the internal Write cycle, the memory disa- bles itself from the bus in order to copy the data from the internal latches to the memory cells. The maximum value of the Write time (tW) is given in the AC Characteristics table, this timing value may be reduced by an ACK polling sequence issued by the master. The sequence is: – Initial condition: a Write is in progress (see Fig- ure 7). – Step 1: the Master issues a START condition fol- lowed by a Device Select Byte. (1st byte of the new instruction) – Step 2: if the memory is internally writing, no ACK will be returned. The Master goes back to Step1. If the memory has terminated the internal writing, it will issue an ACK. The memory is ready to receive the second part of the instruction (the first byte of this instruction was already sent during Step1). |
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