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PF28F1602C3TD70

Intel® Advanced+ Boot Block Flash Memory (C3)

Intel 

C3 SCSP Flash Memory

3.3.1

3.4

3.5

Note:

Clear Status Register (50h)

The WSM sets status bits 1 through 7 to a 1 value, and clears bits 2, 6 and 7 to a 0 value. However,

WSM cannot clear status bits 1 or 3 through 5 to a 0 value. Because bits 1, 3, 4, and 5 indicate

various error conditions, only the Clear Status Register (50h) command can clear these bits.

If the system software controls resetting these bits, several operations (such as cumulatively

programming several addresses or erasing multiple blocks in sequence) can be performed before

reading the status register to determine whether an error occurred during that series.

• Clear the status register before beginning another command or sequence.

• A Read Array command must be issued before data can be read from the memory array.

• Resetting the flash memory device also clears the status register.

CFI Query (98h)

The CFI query mode outputs Common Flash Interface (CFI) data when the flash memory device is

read.

The CFI data structure contains information such as:

• block size

• density

• command set

• electrical specifications

1. To access this mode, write the CFI Query Command (98h).

In this mode, read cycles from addresses shown in Appendix B, “CFI Query Structure”

retrieve the specified information.

2. To return to read array mode, write the Read Array command (FFh).

Word Program (40h/10h)

Programming uses a two-write sequence.

1. The Program Setup command (40h) is written to the CUI.

2. A second write specifies the address and data to program.

3. The WSM executes a sequence of internally timed events to program desired bits of the

addressed location

4. The WSM then verifies that the bits are sufficiently programmed.

Programming the memory changes the value of specific bits within an address to 0.

If you attempt to program a 1 value, the memory cell contents do not change and no error occurs.

26 Aug 2005

16

Intel® Advanced+ Boot Block Flash Memory (C3) SCSP Family

Order Number: 252636, Revision: 004

Datasheet

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