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W29C020P-70B Datasheet(PDF) 8 Page - Winbond |
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W29C020P-70B Datasheet(HTML) 8 Page - Winbond |
8 / 21 page W29C020 - 8 - Command Codes for Product Identification and Boot Block Lockout Detection BYTE SEQUENCE ALTERNATE PRODUCT (7) IDENTIFICATION/BOOT BLOCK LOCKOUT DETECTION ENTRY SOFTWARE PRODUCT IDENTIFICATION/BOOT BLOCK LOCKOUT DETECTION ENTRY SOFTWARE PRODUCT IDENTIFICATION/BOOT BLOCK LOCKOUT DETECTION EXIT ADDRESS DATA ADDRESS DATA ADDRESS DATA 0 Write 5555 AA 5555H AAH 5555H AAH 1 Write 2AAA 55 2AAAH 55H 2AAAH 55H 2 Write 5555 90 5555H 80H 5555H F0H 3 Write - - 5555H AAH - - 4 Write - - 2AAAH 55H - - 5 Write - - 5555H 60H - - Pause 10 µS Pause 10 µS Pause 10 µS Software Product Identification and Boot Block Lockout Detection Acquisition Flow Product Identification Entry (1) Load data AA to address 5555 Load data 55 to address 2AAA Load data 80 to address 5555 Load data AA to address 5555 Load data 55 to address 2AAA Load data 60 to address 5555 Product Identification and Boot Block Lockout Detection Mode (3) Read address = 00000 data = DA Read address = 00001 data = 45 Read address = 00002 data = FF/FE (4) Read address = 3FFF2 data = FF/FE (5) Product Identification Exit (1) Load data AA to address 5555 Load data 55 to address 2AAA Load data F0 to address 5555 Pause 10 S Normal Mode (6) (2) (2) Pause 10 S µ µ Notes for software product identification/boot block lockout detection: (1) Data Format: DQ7 −DQ0 (Hex); Address Format: A14−A0 (Hex) (2) A1 −A16 = 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 (address 0002 Hex/3FFF2 Hex respond to first 8K/last 8K) lockout detection mode if power down. (4), (5) If the output data is "FF Hex," the boot block programming lockout feature is activated; if the output data "FE Hex," the lockout feature is inactivated and the block can be programmed. (6) The device returns to standard operation mode. (7) This product supports both the JEDEC standard 3 byte command code sequence and original 6 byte command code sequence. For new designs, Winbond recommends that the 3 byte command code sequence be used. |
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