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STTS2004 数据表(PDF) 41 Page - STMicroelectronics |
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STTS2004 数据表(HTML) 41 Page - STMicroelectronics |
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41 / 58 page ![]() DocID024229 Rev 3 41/58 STTS2004 Use in a memory module 58 6.1.2 DIMM inserted in the application motherboard As the final application cannot drive the A0 pin to VHV, this option is not available. Table 26 and Table 27 show how the Ack bits can be used to identify the write-protection status. Table 26. Acknowledge when writing data or defining the write-protection status (instructions with R/W_n bit = 0) Status Instruction Ack Address Ack Data byte Ack Write cycle (tW) Protected SWPn NoAck Not significant NoAck Not significant NoAck No CWP Ack Not significant Ack Not significant Ack Yes Page or byte write in protected block Ack Address Ack Data NoAck No Not protected SWPn or CWP Ack Not significant Ack Not significant Ack Yes Page or byte write Ack Address Ack Data Ack Yes Table 27. Acknowledge when reading the protection status (instructions with R/W_n bit = 1) SWPn status Instruction Ack Address Ack Data byte Ack Set RPSn NoAck Not significant NoAck Not significant NoAck Not set RPSn Ack Not significant NoAck Not significant NoAck |
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