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STTS424E02 数据表(PDF) 37 Page - STMicroelectronics |
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STTS424E02 数据表(HTML) 37 Page - STMicroelectronics |
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37 / 51 page ![]() STTS424E02 Use in a memory module 37/51 7.1.2 DIMM inserted in the application motherboard As the final application cannot drive the A0 pin to VHV, the only possible action is to freeze the write-protection with the PSWP instruction. Table 23 and Table 24 show how the Ack bits can be used to identify the write-protection status. Table 23. Acknowledge when writing data or defining the write-protection (instructions with R/W bit=0) Status WC Input Level Instruction Ack Address Ack Data byte Ack Write cycle(tW) Permanently protected X PSWP, SWP or CWP NoAck Not significant NoAck Not significant NoAck No Page or byte write in lower 128 bytes Ack Address Ack Data NoAck No Protected with SWP SWP NoAck Not significant NoAck Not significant NoAck No CWP Ack Not significant Ack Not significant Ack Yes 0 PSWP Ack Not significant Ack Not significant Ack Yes Page or byte write in lower 128 bytes Ack Address Ack Data NoAck No Not Protected 0 PSWP, SWP or CWP Ack Not significant Ack Not significant Ack Yes Page or byte write Ack Address Ack Data Ack Yes |
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