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W49V002A Datasheet(PDF) 11 Page - Winbond |
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W49V002A Datasheet(HTML) 11 Page - Winbond |
11 / 32 page Preliminary W49V002A Publication Release Date: April 2001 - 11 - Revision A1 Command Codes for Product Identification and Boot Block Lockout Detection BYTE SEQUENCE SOFTWARE PRODUCT IDENTIFICATION / BOOT BLOCK LOCKOUT DETECTION ENTRY SOFTWARE PRODUCT IDENTIFICATION / BOOT BLOCK LOCKOUT DETECTION EXIT (6) ADDRESS DATA ADDRESS DATA 1 Write 5555 AA 5555H AAH 2 Write 2AAA 55 2AAAH 55H 3 Write 5555 90 5555H F0H Pause 10 µS Pause 10 µS Software Product Identification and Boot Block Lockout Detection Acquisition Flow Product Identification Entry (1) Load data 55 to address 2AAA Load data 90 to address 5555 Pause 10 S Product Identification and Boot Block Lockout Detection Mode (3) Read address = 00000 data = DA Read address = 00001 data = B0 Read address = 00002 DQ0 of data outputs = 1/0 (4) Product Identification Exit(6) Load data 55 to address 2AAA Load data F0 to address 5555 Normal Mode (5) (2) (2) Load data AA to address 5555 µ Load data AA to address 5555 Pause 10 S µ Notes for software product identification/boot block lockout detection: (1) Data Format: DQ7 −DQ0 (Hex); Address Format: A14−A0 (Hex) (2) A1 −A17 = VIL; manufacture code is read for A0 = VIL; device code is read for A0 = VIH. (3) The device does not remain in identification and boot block lockout detection mode if power down. (4) If the DQ0 of output data is "1," the boot block programming lockout feature is activated; if the DQ0 of output data "0," the lockout feature is inactivated and the block can be programmed. (5) The device returns to standard operation mode. (6) Optional 1-write cycle (write F0 hex at XXXX address) can be used to exit the product identification/boot block lockout detection. |
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