JS28F256P33BFE datasheet(27/90 Pages) MICRON

27 / 90 page

Datasheet

Aug 2009

Order Number:320003-08

P33-65nm

To read data from the device, the Read Array command must be issued. Read Array,

Read Status Register, Read Device Identifier, Read CFI, and Program Resume are valid

commands during a program suspend.

During a program suspend, deasserting CE# places the device in standby, reducing

active current. VPP must remain at its programming level, and WP# must remain

unchanged while in program suspend. If RST# is asserted, the device is reset.

8.5

Program Resume

The Resume command instructs the device to continue programming, and

automatically clears Status Register bits SR[7,2]. This command can be written to any

address. If error bits are set, the Status Register should be cleared before issuing the

next instruction. RST# must remain deasserted (see Figure 32, “Program Suspend/

Resume Flowchart” on page 73).

8.6

Program Protection

When VPP = VIL, absolute hardware write protection is provided for all device blocks. If

VPP is at or below VPPLK, programming operations halt and SR.3 is set indicating a VPP-

level error. Block lock registers are not affected by the voltage level on VPP; they may

still be programmed and read, even if VPP is less than VPPLK.

Figure 7: Example VPP Supply Connections

• Factory Programming with

PP = VPPH

• Complete write/Erase Protection when

PP ≤ VPPLK

VCC

VPP

VCC

VPP

• Low Voltage and Factory Programming

• Low-voltage Programming only

• Logic Control of Device Protection

VCC

VPP

• Low Voltage Programming Only

• Full Device Protection Unavailable

VCC

VPP

≤ 10K Ω

PROT #

PP=VPPH

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