TE28F800C3BA90 查看數據表（PDF） - Intel

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TE28F800C3BA90

Intel Advanced+ Boot Block Flash Memory (C3)

Intel 

Intel£ Advanced+ Boot Block Flash Memory (C3)

5.1.1

5.1.1.1

5.1.1.2

5.1.1.3

5.2

Locking Operation

The locking status of each block can be set to Locked, Unlocked, or Lock-Down, each of which

will be described in the following sections. See Figure 5, “Block Locking State Diagram” on

page 27 and Figure 17, “Locking Operations Flowchart” on page 56.

The following concisely summarizes the locking functionality.

Locked State

The default state of all blocks upon power-up or reset is locked (states [001] or [101]). Locked

blocks are fully protected from alteration. Any Program or Erase operations attempted on a locked

block will return an error on bit SR[1] of the Status Register. The state of a locked block can be

changed to Unlocked or Lock Down using the appropriate software commands. An Unlocked

block can be locked by writing the Lock command sequence, 0x60 followed by 0x01.

Unlocked State

Unlocked blocks (states [000], [100], [110]) can be programmed or erased. All unlocked blocks

return to the Locked state when the device is reset or powered down. The status of an unlocked

block can be changed to Locked or Locked Down using the appropriate software commands. A

Locked block can be unlocked by writing the Unlock command sequence, 0x60 followed by 0xD0.

Lock-Down State

Blocks that are Locked-Down (state [011]) are protected from Program and Erase operations (just

like Locked blocks), but their protection status cannot be changed using software commands alone.

A Locked or Unlocked block can be Locked Down by writing the Lock-Down command sequence,

0x60 followed by 0x2F. Locked-Down blocks revert to the Locked state when the device is reset or

powered down.

The Lock-Down function depends on the WP# input pin. When WP# = 0, blocks in Lock Down

[011] are protected from program, erase, and lock status changes. When WP# = 1, the Lock-Down

function is disabled ([111]) and Locked-Down blocks can be individually unlocked by software

command to the [110] state, where they can be erased and programmed. These blocks can then be

relocked [111] and unlocked [110] as required while WP# remains high. When WP# goes low,

blocks that were previously Locked Down return to the Lock-Down state [011], regardless of any

changes made while WP# was high. Device reset or power-down resets all blocks, including those

in Lock-Down, to Locked state.

Reading Block-Lock Status

The Lock status of each block can be read in read-identifier mode of the device by issuing the read-

identifier command (0x90). Subsequent reads at Block Address + 0x00002 will output the Lock

status of that block. The Lock status is represented by DQ0 and DQ1. DQ0 indicates the Block

Lock/Unlock status and is set by the Lock command and cleared by the Unlock command. It is also

automatically set when entering Lock Down. DQ1 indicates Lock-Down status, and is set by the

Lock-Down command. It cannot be cleared by software—only by device reset or power-down. See

Table 6, “Device Identification Codes” on page 20 for block-status information.

28

Datasheet

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