28F004BE Ver la hoja de datos (PDF) - Intel
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28F004BE Datasheet PDF : 57 Pages
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E
4-MBIT SmartVoltage BOOT BLOCK FAMILY
Table 6. Command Codes and Descriptions (Continued)
Code Device Mode
Decription
50 Clear Status The WSM can only set the Program Status and Erase Status bits in the Status
Register Register to “1;” it cannot clear them to “0.”
The Status Register operates in this fashion for two reasons. The first is to give the
host CPU the flexibility to read the status bits at any time. Second, when
programming a string of bytes, a single Status Register query after programming
the string may be more efficient, since it will return the accumulated error status of
the entire string. See Section 3.3.2.1.
90
Intelligent Puts the device into the intelligent identifier read mode, so that reading the device
Identifier
will output the manufacturer and device codes. (A0 = 0 for manufacturer,
A0 = 1 for device, all other address inputs are ignored). See Section 3.2.2.
Command
Read Array
Intelligent Identifier
Read Status Register
Clear Status Register
Word/Byte Program
Alternate Word/Byte
Program
Block Erase/Confirm
Erase Suspend
Erase Resume
Table 7. Command Bus Definitions
First Bus Cycle
Note Oper Addr
Data
8
Write
X
FFH
1
Write
X
90H
2,4 Write
X
70H
3
Write
X
50H
Write
PA
40H
6,7 Write
PA
10H
Second Bus Cycle
Oper
Addr
Data
Read
IA
IID
Read
X
SRD
Write
PA
PD
Write
PA
PD
6,7 Write
BA
20H
Write
BA
D0H
5
Write
X
B0H
Write
X
D0H
ADDRESS
BA = Block Address
IA = Identifier Address
PA = Program Address
X = Don’t Care
DATA
SRD = Status Register Data
IID = Identifier Data
PD = Program Data
NOTES:
1. Bus operations are defined in Tables 3 and 4.
2. IA = Identifier Address: A0 = 0 for manufacturer code, A0 = 1 for device code.
3. SRD - Data read from Status Register.
4. IID = Intelligent Identifier Data. Following the Intelligent Identifier command, two read operations access manufacturer and
device codes.
5. BA = Address within the block being erased.
6. PA = Address to be programmed. PD = Data to be programmed at location PA.
7. Either 40H or 10H commands is valid.
8. When writing commands to the device, the upper data bus [DQ8–DQ15] = X (28F400 only) which is either VIL or VIH, to
minimize current draw.
PRELIMINARY
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