E82802AC8 datasheet(21/53 Pages) INTEL

21 / 53 page

Intel

® 82802AB/AC Firmware Hub

Datasheet

4.1.

Read Array Command

Upon initial device power-up and after exit from reset, the device defaults to the read array mode. This

operation can also be initiated by writing the Read Array command. The device remains available for

array reads until another command is written. Once the internal write state machine (WSM) has started a

block erase or program, the device will not recognize the Read Array command until the operation is

completed, unless the operation is suspended via an Erase Suspend or Program Suspend command. The

Read Array command functions independently of the VPP voltage.

4.2.

Read Identifier Codes Command

The identifier code operation is initiated by writing the Read Identifier Codes command. Following the

write of the command, the device will read back the (manufacturer and device) ID data from the

addresses shown in the following table. To terminate the read identifier code operation, write another

valid command to the Intel FWH. The Read Identifier Codes command functions independently of the

PP voltage.

Table 4.

Identifier Codes

Code

Address

Data

Manufacturer code

000000

Device code

4 Mbit

000001

Device code

8 Mbit

000001

4.3.

Read Status Register Command

The status register may be read to determine when a block erase or program completes, and whether the

operation completed successfully. The status register may be read at any time by writing the Read Status

status register until another valid command is written. The Read Status Register command functions

independently of the V

PP voltage.

4.4.

Clear Status Register Command

Error flags in the status register can only be set to 1s by the WSM and can only be reset by the Clear

Status Register command. These bits indicate various conditions that may cause failure. The Clear Status

PP voltage.

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