AS3953B datasheet(21/64 Pages) AMSCO

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[v1-04] 2016-Jan-07

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AS3953B − Detailed Description

Word Address Byte

Both proprietary commands related to EEPROM (Read and

Write) use Word Address byte to define the address of EEPROM

word that is accessed. Seven MSB bits of the Address Byte are

used to define the address, while the last bit is “don’t care”.

Note(s): The valid range for the Word Address byte is from 0000

000xb to 0011 111xb (EEPROM words from 00h to 1Fh).

Read EEPROM

The Read EEPROM command is used to read data from the

EEPROM. The request information field contains the following

three bytes:

• Command code byte (02h)

• Address of the first word to be read

• Number of words to be read

Figure below defines coding of Read EEPROM command

information field.

Figure 28:

Read EEPROM Command

If the request is normally processed, the reply information field

contains the status word 90h followed by the data. In case of

error, the information field only contains the error status byte.

The following rules apply:

• In case the number of words to be read is higher than 8,

first eight words are read.

• In case the read protected word (its read lock bit is set) is

accessed, an all ‘0’ data is sent out.

• In case the reading starts at valid address and the number

of words to read is such that the reading would be done

beyond the EEPROM addressing space, all ‘0’ data is

returned for non-existing addresses.

• In case the reading starts at non-existing address, error

information field is returned.

02h

Address of First

Word to Be Read

Number of Words

(

≤ 8) to Be Read

1byte

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