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W39V040FAT Datasheet(PDF) 6 Page - Winbond |
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W39V040FAT Datasheet(HTML) 6 Page - Winbond |
6 / 36 page W39V040FA - 6 - Block Locking Registers This part provides 8 even 64Kbytes blocks, and each block can be locked by register control. These control registers can be set or clear through memory address. Below is the detail description. Block Locking Registers type and access memory map Table REGISTERS REGISTERS TYPE CONTROL BLOCK DEVICE PHYSICAL ADDRESS 4GBYTES SYSTEM MEMORY ADDRESS BLR7 R/W 7 7FFFFh – 70000h FFBF0002h BLR6 R/W 6 6FFFFh – 60000h FFBE0002h BLR5 R/W 5 5FFFFh – 50000h FFBD0002h BLR4 R/W 4 4FFFFh – 40000h FFBC0002h BLR3 R/W 3 3FFFFh – 30000h FFBB0002h BLR2 R/W 2 2FFFFh – 20000h FFBA0002h BLR1 R/W 1 1FFFFh – 10000h FFB90002h BLR0 R/W 0 0FFFFh – 00000h FFB80002h Block Locking Register Bits Function Table BIT FUNCTION 7 – 3 Reserved 2 Read Lock 1: Prohibit to read in the block where set 0: Normal read operation in the block where clear. This is default state. 1 Lock Down 1: Prohibit further to set or clear the Read Lock or Write Lock bits. This Lock Down Bit can only be set not clear. Only the device is reset or re-powered, the Lock Down Bit is cleared. 0: Normal operation for Read Lock or Write Lock. This is the default state. 0 Write Lock 1: Prohibited to write in the block where set. This is default state. 0: Normal programming/erase operation in the block where clear. Register Based Block Locking Value Definitions Table BIT [7:3] BIT 2 BIT 1 BIT 0 RESULT 00000 0 0 0 Full Access. 00000 0 0 1 Write Lock. Default State. 00000 0 1 0 Locked Open (Full Access, Lock Down). 00000 0 1 1 Write Locked, Locked Down. 00000 1 0 0 Read Locked. 00000 1 0 1 Read & Write Locked. 00000 1 1 0 Read Locked, Locked Down. 00000 1 1 1 Read & Write Locked, Locked Down. |
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