RC28F256 Intel Corporation, RC28F256 Datasheet - Page 83

• Manufacturer Part Number: RC28F256
• Description: Intel StrataFlash Embedded Memory
• Manufacturer: Intel Corporation

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Figure 39.
Notes:
1.
2.
3.
4.
Datasheet
BEFP Setup,
BEFP Pgm & Verify
Busy,
Erase Setup,
OTP Setup,
BP: Setup, Load 1,
Load 2, Confirm,
Word Pgm Setup,
Word Pgm Setup in
Erase Susp,
BP Setup, Load1,
Load 2, Confirm in
Erase Suspend
Lock/CR Setup,
Lock/CR Setup in
Erase Susp
OTP Busy
Ready,
Erase Suspend,
BP Suspend
BP Busy,
Word Program
Busy,
Erase Busy,
BP Busy
BP Busy in Erase
Suspend
Word Pgm
Suspend,
Word Pgm Busy in
Erase Suspend,
Pgm Suspend In
Erase Suspend
Current chip state
"Illegal commands" include commands outside of the allowed command set (allowed commands: 40H [pgm], 20H [erase],
etc.)
If a "Read Array" is attempted from a busy partition, the result will be invalid data. The ID and Query data are located at
different locations in the address map.
1st and 2nd cycles of "2 cycles write commands" must be given to the same partition address, or unexpected results will
occur.
To protect memory contents against erroneous command sequences, there are specific instances in a multi-cycle
command sequence in which the second cycle will be ignored. For example, when the device is program suspended and
an erase setup command (0x20) is given followed by a confirm/resume command (0xD0), the second command will be
ignored because it is unclear whether the user intends to erase the block or resume the program operation.
Write State Machine—Next State Table (Sheet 6 of 6)
Output Next State Table
Setup
(C0H)
Status
Read
OTP
(4)
Command Input to Chip and resulting Output Mux Next State
Confirm
Status Read
Block
(01H)
Lock
Intel StrataFlash
Output does not change.
(8)
Order Number: 306666, Revision: 001
Lock-Down
Confirm
Block
(2FH)
(8)
Status Read
Confirm
Write CR
(03H)
Array
Read
®
Embedded Memory (P30)
(8)
Block Address
Array Read
(FFFFH)
(?WA0)
Status Read
(all other codes)
Output does not
Illegal Cmds or
BEFP Data
change.
(1)
Output does
not change.
Completes
Operation
WSM
1-Gbit P30 Family
April 2005
83