JS28F256P30T95 Micron Technology Inc, JS28F256P30T95 Datasheet - Page 38

• Manufacturer Part Number: JS28F256P30T95
• Manufacturer: Micron Technology Inc

Specifications of JS28F256P30T95

• Cell Type: NOR
• Density: 256Mb
• Access Time (max): 95/17ns
• Interface Type: Parallel/Serial
• Boot Type: Top
• Address Bus: 24b
• Operating Supply Voltage (typ): 1.8V
• Operating Temp Range: -40C to 85C
• Package Type: TSOP
• Program/erase Volt (typ): 1.7 to 2/8.5 to 9.5V
• Sync/async: Async/Sync
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 1.7V
• Operating Supply Voltage (max): 2V
• Word Size: 16b
• Number Of Words: 16M
• Supply Current: 28mA
• Mounting: Surface Mount
• Pin Count: 56
• Lead Free Status / Rohs Status: Compliant

10.1.4
Figure 12: Block Locking State Diagram
10.1.5
Note:
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or Lock-Down Block produces a command sequence error and set Status Register bits SR[4]
and SR[5]. If a command sequence error occurs during an erase suspend, SR[4] and SR[5]
remains set, even after the erase operation is resumed. Unless the Status Register is cleared
using the Clear Status Register command before resuming the erase operation, possible erase
errors may be masked by the command sequence error.
A Lock Block Setup command followed by any command other than Lock Block, Unlock Block,
Power-Up/Reset
Notes:
Block Lock Status
The Read Device Identifier command is used to determine a block’s lock status (see
Section 12.0, “Power and Reset Specifications” on page
the addressed block’s lock status; DQ0 is the addressed block’s lock bit, while DQ1 is
the addressed block’s lock-down bit.
Block Locking During Suspend
Block lock and unlock changes can be performed during an erase suspend. To change
block locking during an erase operation, first issue the Erase Suspend command.
Monitor the Status Register until SR[7] and SR[6] are set, indicating the device is
suspended and ready to accept another command.
Next, write the desired lock command sequence to a block, which changes the lock
state of that block. After completing block lock or unlock operations, resume the erase
operation using the Erase Resume command.
1. [a,b,c] represents [WP#, DQ1, DQ0]. X = Don’t Care.
2. DQ1 indicates Block Lock-Down status. DQ1 = ‘0’, Lock-Down has not been issued
3. DQ0 indicates block lock status. DQ0 = ‘0’, block is unlocked. DQ0 = ‘1’, block is
4. Locked-down = Hardware + Software locked.
5. [011] states should be tracked by system software to determine difference between
to this block. DQ1 = ‘1’, Lock-Down has been issued to this block.
locked.
Hardware Locked and Locked-Down states.
Unlocked
Locked
[X01]
[X00]
Software Block Lock (0x60/0x01) or Software Block Unlock (0x60/0xD0)
Software Block Lock-Down (0x60/0x2F)
W P# hardware control
Software
Locked-
Down
Locked
[111]
[011]
4,5
WP# Hardware Control
50). Data bits DQ[1:0] display
Hardware
Unlocked
Locked
[011]
[110]
5
August 2008
306666-12
P30