SMART 5 BOOT BLOCK MEMORY FAMILY
E
To resume the erase operation, enable the chip by
taking CE# to VIL, then issue the Erase Resume
command, which continues the erase sequence to
completion. As with the end of a standard erase
operation, the status register must be read, cleared,
and the next instruction issued in order to continue.
Table 5. Command Codes and Descriptions
Code Device Mode
Description
00
FF
40
Invalid/
Reserved
Unassigned commands that should not be used. Intel reserves the right to redefine
these codes for future functions.
Read Array Places the device in read array mode, so that array data will be output on the data
pins.
Program
Set-Up
Sets the CUI into a state such that the next write will load the Address and Data
registers. The next write after the Program Set-Up command will latch addresses
and data 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 cannot cancel that
operation in progress.
10
20
Alternate
Prog Set-Up
(See 40H/Program Set-Up)
Erase
Set-Up
Prepares the CUI for the Erase Confirm command. If the next command is not 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 can not cancel that operation in progress.
D0
B0
Erase
Resume/
Erase
If the previous command was an Erase Set-Up command, then the CUI will latch
address and data, 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 is updated by toggling either OE# or CE# low.
Confirm
Erase
Suspend
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 3.2.5.1. This command is useful only while
an erase operation is in progress and may reset to read array mode in other
circumstances. (See Appendix A for state transition table.)
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 3.2.3.
18
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INTEL [ INTEL ]
