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W29GL032C Datasheet(PDF) 19 Page - Winbond |
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W29GL032C Datasheet(HTML) 19 Page - Winbond |
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19 / 66 page  W29GL032C Publication Release Date: October 18, 2011 13 Preliminary - Revision E 7.2.17.3 Read Silicon Device ID Code To verify the Silicon Device ID Codes, execute a Read Operation with VHH applied to the A9 pin and address pins A6, A3, A2, A1, and A0 have several bit combinations to return the Winbond Device ID codes of 7Eh, 21h or 01h, which is shown on the data bits DQ[7:0]. See Table 7-2. 7.2.17.4 Read Indicator Bit DQ7 for Security Sector High and Low Address To verify that the Security Sector has been factory locked, execute a Read Operation with VHH applied to A9, address pins A6, A3, and A2 are held Low, and address pins A1 and A0 are held High. If the Security Sector has been factory locked, the code 9Ah(Highest Address Sector) or 8Ah(Lowest Address Sector) will be shown on the data bits DQ[7:0]. Otherwise, the factory unlocked code of 1Ah(H)/0A(L) will be shown. 7.2.18 Automatic Select Operations The Automatic Select instruction show in Table 7-13 can be executed if the device is in one of the following modes; Read, Program Suspended, Erase-Suspended Read, or CFI. At which time the user can issue (two unlock cycles followed by the Automatic Select instruction 90h) to enter Automatic Select mode. Once in the Automatic Select mode, the user can query the Manufacturer ID, Device ID, Security Sector locked status, or Sector protected status multiple times without executing the unlock cycles and a Automatic Select instruction (90h) again. Once in Automatic Select mode, executing a Reset instruction (F0h) will return the device back to the valid mode from which it left when the Automatic Select mode was first executed. Another way previously mentioned to enter Automatic Select mode is to use one of the bus operation shown Table 7-2 in Device Bus Operation. Once the high voltage (VHH) is removed from the A9 pin, the device will return back to the valid mode from which it left when the Automatic Select mode was first executed. 7.2.19 Automatic Select Instruction Sequence Accessing the manufacturer ID, device ID, and verifying whether or not secured silicon is locked and whether or not a sector protected is the purpose of Automatic Select mode. There are four instruction cycles that comprise the Automatic Select mode. The first two cycles are write unlock commands, followed by the Automatic Select instruction (90h). The fourth cycle is a read cycle, and the user may read at any address any number of times without entering another instruction sequence. To exit the Automatic Select mode and back to read array, the Reset instruction is necessary. No other instructions are allowed except the Reset Instruction once Automatic Select mode has been selected. Refer to the following table for more detailed information. Address Data (hex) Representation Manufacturer ID Word X00 01 Byte X00 01 Device ID H/L Word X01/0E/0F 227E/221D/2201 Byte X02/1C/1E 7E/1D/01 T/B Word X01/0E/0F 227E/221A/2201(T)/2200(B) Byte X02/1C/1E 7E/1A/01(T)/00(B) Secure Silicon Word X03 9A/1A(H) Factory locked/unlocked 8A/0A(L) Byte X06 9A/1A(H) Factory locked/unlocked 8A/0A(L) Sector Protect Verify Word (Sector address) X02 00/01 Unprotected/protected Byte Sector address) X04 00/01 Unprotected/protected Table 7-9 Auto Select for MFR/Device ID/Secure Silicon/Sector Protect Read |
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