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SE97B Datasheet(PDF) 19 Page - NXP Semiconductors |
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SE97B Datasheet(HTML) 19 Page - NXP Semiconductors |
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19 / 53 page  SE97B_1 © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 01 — 27 January 2010 19 of 53 NXP Semiconductors SE97B DDR memory module temp sensor with integrated SPD 7.10.2.2 Reversible Write Protection (RWP) and Clear Reversible Write Protection (CRWP) If the software write-protection has been set with the RWP instruction, it can be cleared again with a CRWP instruction. The two instructions, RWP and CRWP have the same format as a Byte Write instruction, but with a different setting for the hardware address pins (as shown in Table 6). Like the Byte Write instruction, it is followed by an address byte and a data byte, but in this case the contents are all ‘Don’t Care’ (Figure 13). Another difference is that the voltage, VI(ov), must be applied on the A0 pin, and specific logical levels must be applied on the other two (A1 and A2), as shown in Table 6. 7.10.2.3 Read Permanent Write Protection (RPWP), Read Reversible Write Protection (RRWP), and Read Clear Reversible Write Protection (RCRWP) Read PWP, RWP, and CRWP allow the SE97B to be read in write protection mode. The instruction format is the same as that of the write protection except that the 8th bit, R/W, is set to 1. Figure 14 shows the instruction format, while Table 8 shows the responses when the instructions are issued. Table 7. Acknowledge when writing data or defining write protection Instructions with R/W bit = 0. Status Instruction ACK Address ACK Data byte ACK Write cycle (tW) Permanently protected PWP, RWP or CRWP NACK not significant NACK not significant NACK no page or byte write in lower 128 bytes ACK address ACK data NACK no Protected with RWP RWP NACK not significant NACK not significant NACK no CRWP ACK not significant ACK not significant ACK yes PWP ACK not significant ACK not significant ACK yes page or byte write in lower 128 bytes ACK address ACK data NACK no Not protected PWP or RWP ACK not significant ACK not significant ACK yes CRWP ACK not significant ACK not significant ACK no page or byte write ACK address ACK data ACK yes Table 8. Acknowledge when reading the write protection Instructions with R/W bit = 1. Status Instruction ACK Address ACK Data byte ACK Permanently protected RPWP, RRWP or RCRWP NACK not significant NACK not significant NACK Protected with RWP RRWP NACK not significant NACK not significant NACK RCRWP ACK not significant NACK not significant NACK RPWP ACK not significant NACK not significant NACK Not protected RPWP, RRWP or RCRWP ACK not significant NACK not significant NACK |
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