S25FL002D0FMAI011 datasheet(22/38 Pages) SPANSION

22 / 38 page

S25FL Family (Serial Peripheral Interface)

30167A+1 June 9, 2004

P r el i m i n a r y

I n fo r m a t i o n

Figure 13. Bulk Erase (BE) Instruction Sequence

Software Protect (SP)

The Software Protect (SP) instruction implemented in this device is compatible

with industry-standard Software Protect (SP) operation. For this device, this in-

struction has no real function since the Standby Current (ISB) on this device is

the same as the Deep Power-down Current in our competitor's devices.

It is recommended that the standard Standby mode be used for the lowest power

current draw, as well as the Software Protect (SP) as an extra software protection

mechanism when this device is not in active use. In this mode, the device ignores

all Write, Program and Erase instructions. Chip Select (CS#) must be driven Low

for the entire duration of the sequence.

The Software Protect (SP) instruction is entered by driving Chip Select (CS#)

Low, followed by the instruction code on Serial Data Input (SI). Chip Select (CS#)

must be driven Low for the entire duration of the sequence.

The instruction sequence is shown in Figure 14.

Driving Chip Select (CS#) High after the eighth bit of the instruction code has

been latched in deselects the device, and puts the device in the Standby mode (if

there is no internal cycle currently in progress). As soon as Chip Select (CS#) is

driven high, it requires a delay of tSP currently in progress before Software Pro-

tect mode is entered.

Once the device has entered the Software Protect mode, all instructions are ig-

nored except the Release from Software Protect (RES) or Read ID (READ_ID)

instruction. The Release from Software Protect and Read Electronic Signature

(RES) instruction also allows the Electronic Signature of the device to be output

on Serial Data Output (SO).

The Software Protect mode automatically stops at Power-down, and the device

always Powers-up in the Standby mode.

Instruction

CS#

SCK

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