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W29GL032C
7.2.17.3
Read Silicon Device ID Code
To verify the Silicon Device ID Codes, execute a Read Operation with V HH 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 V HH 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 (V HH ) 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
Byte
X00
X00
01
01
Device ID
H/L
T/B
Word
Byte
Word
Byte
X01/0E/0F
X02/1C/1E
X01/0E/0F
X02/1C/1E
227E/221D/2201
7E/1D/01
227E/221A/2201(T)/2200(B)
7E/1A/01(T)/00(B)
Secure Silicon
Word
Byte
X03
X06
9A/1A(H)
8A/0A(L)
9A/1A(H)
8A/0A(L)
Factory locked/unlocked
Factory locked/unlocked
Sector Protect Verify
Word (Sector address) X02
Byte Sector address) X04
00/01
00/01
Unprotected/protected
Unprotected/protected
Table 7-9
Auto Select for MFR/Device ID/Secure Silicon/Sector Protect Read
Publication Release Date: August 2, 2013
13
Revision H
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