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E28F008BV-B70

8-MBIT SmartVoltage BOOT BLOCK FLASH MEMORY FAMILY

Intel 

8-MBIT SmartVoltage BOOT BLOCK FLASH MEMORY FAMILY

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Table 6. Command Codes and Descriptions

Code Device Mode

Description

00

Invalid/

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

Reserved redefine 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)

Program Set-Up

20

Erase

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

Set-Up

an 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 Set-Up command has been issued. If an operation has already been

initiated to the WSM this cannot cancel that operation in progress.

D0 Erase Resume/ If the previous command was an Erase Set-Up command, then the CUI will

Erase Confirm close the address and data latches, and begin erasing the block indicated on the

address pins. During erase, the device will respond only to the Read Status

Register and Erase Suspend commands and will output status register data

when OE# is toggled low. Status register data can be 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

Suspend

other 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

will output the contents of the status register, 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

SEE NEW DESIGN RECOMMENDATIONS

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