E
2-MBIT SmartVoltage BOOT BLOCK FAMILY
Table 6. Command Codes and Descriptions (Continued)
Description
Code Device Mode
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
Identifier
Puts the device into the intelligent identifier read mode, so that reading the device
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.
Table 7. Command Bus Definitions
First Bus Cycle (1)
Second Bus Cycle (1)
Command
Note
Oper
Addr
X
Data
Oper
Addr
Data
Read Array
1
1, 2, 4
3
Write
Write
Write
Write
Write
Write
Write
Write
FFH
90H
Intelligent Identifier
Read Status Register
Clear Status Register
Word/Byte Program
Block Erase/Confirm
Erase Suspend
X
Read
Read
IA
X
IID
X
70H
SRD
X
50H
1, 6, 7
1, 5
PA
BA
X
40H/10H
20H
Write
Write
PA
BA
PD
D0H
B0H
Erase Resume
X
D0H
ADDRESS
DATA
BA= Block Address
IA= Identifier Address
PA= Program Address
X= Don’t Care
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 [DQ –DQ15] = X (28F200 only) which is either VIL or VIH, to
8
minimize current draw.
19
SEE NEW DESIGN RECOMMENDATIONS
INTEL [ INTEL ]
