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4-MBIT (256K X 16, 512K X 8) SmartVoltage BOOT BLOCK FLASH

Intel 

4-MBIT SmartVoltage BOOT BLOCK FAMILY

E

Table 6. Command Codes and Descriptions

Code Device Mode

Decription

00

Invalid/ Unassigned commands that should not be used. Intel reserves the right to redefine

Reserved these codes for future functions.

FF Read Array Places the device in read array mode, so that array data will be output on the data

pins.

40

Program Sets the CUI into a state such that the next write will latch the Address and Data

Set-Up registers on the rising edge and begin the program algorithm. The device then

defaults to the read status mode, where the device outputs Status Register data

when OE# is enabled. To read the array, issue a Read Array command.

To cancel a program operation after issuing a Program Set-Up command, write all

1’s (FFH for x8, FFFFH for x16) to the CUI. This will return to read status register

mode after a standard program time without modifying array contents. If a program

operation has already been initiated to the WSM this command can not cancel that

operation in progress.

10

Alternate (See 40H/Program Set-Up)

Prog Set-Up

20

Erase

Prepares the CUI for the Erase Confirm command. If the next command is not an

Set-Up Erase Confirm command, then the CUI will set both the Program Status (SR.4) and

Erase Status (SR.5) bits of the Status Register to a “1,” place the device into the

read Status Register state, and wait for another command without modifying array

contents. This can be used to cancel an erase operation after the Erase Setup

command has been issued. If an operation has already been initiated to the WSM

this can not cancel that operation in progress.

D0

Erase

If the previous command was an Erase Set-Up command, then the CUI will latch

Resume/ address and data, and begin erasing the block indicated on the address pins.

Erase

During erase, the device will respond only to the Read Status Register and Erase

Confirm Suspend commands and will output Status Register data when OE# is toggled low.

Status Register data is updated by toggling either OE# or CE# low.

B0

Erase

Valid only while an erase operation is in progress and will be ignored in any other

Suspend circumstance. Issuing this command will begin to suspend erase operation. The

Status Register will indicate when the device reaches erase suspend mode. In this

mode, the CUI will respond only to the Read Array, Read Status Register, and

Erase Resume commands and the WSM will also set the WSM Status bit to a “1”

(ready). The WSM will continue to idle in the SUSPEND state, regardless of the

state of all input control pins except RP#, which will immediately shut down the

WSM and the remainder of the chip, if it is made active. During a suspend

operation, the data and address latches will remain closed, but the address pads

are able to drive the address into the read path. See Section 3.3.4.1.

70 Read Status Puts the device into the read Status Register mode, so that reading the device

Register outputs Status Register data, regardless of the address presented to the device.

The device automatically enters this mode after program or erase has completed.

This is one of the two commands that is executable while the WSM is operating.

See Section 3.3.2.

18

PRELIMINARY

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