AD9520-5SLASHPCBZ datasheet(74/80 Pages) AD

74 / 80 page

AD9520-5

Rev. 0 | Page 74 of 80

Table 54. EEPROM Buffer Segment

Reg.

Addr

(Hex) Bit(s) Name

Description

A00 to

A16

[7:0] EEPROM Buffer

Segment Register 1

to EEPROM Buffer

Segment Register 23

The EEPROM buffer segment section stores the starting address and number of bytes that are to be

stored and read back to and from the EEPROM. Because the AD9520 register space is noncontiguous,

the EEPROM controller needs to know the starting address and number of bytes in the AD9520 register

space to store and retrieve from the EEPROM. In addition, there are special instructions for the EEPROM

controller, operational codes (that is, IO_UPDATE and end-of-data) that are also stored in the EEPROM

buffer segment. The on-chip default setting of the EEPROM buffer segment registers is designed such

that all registers are transferred to/from the EEPROM, and an IO_UPDATE is issued after transfer. See the

Programming the EEPROM Buffer Segment section for more information.

Table 55. EEPROM Control

Reg.

Addr

(Hex) Bit(s) Name

Description

B00

[0]

STATUS_EEPROM

(read-only)

This read-only register indicates the status of the data transferred between the EEPROM and the buffer

when 0x01D[7] is set.

[0] = 0; data transfer is done.

[0] = 1; data transfer is not done.

B01

[0]

EEPROM

data error

(read-only)

This read-only register indicates an error during the data transferred between the EEPROM and the buffer.

[0] = 0; no error. Data is correct.

[0] = 1; incorrect data detected.

B02

[1]

Soft_EEPROM

When the EEPROM pin is tied low, setting Soft_EEPROM resets the AD9520 using the settings saved in

EEPROM.

[1] = 1; soft reset with EEPROM settings (self-clearing).

B02

[0]

Enable EEPROM

write

Enables the user to write to the EEPROM.

[0] = 0; EEPROM write protection is enabled. User cannot write to EEPROM (default).

[0] = 1; EEPROM write protection is disabled. User can write to EEPROM.

B03

[0]

REG2EEPROM

Transfers data from the buffer register to the EEPROM (self-clearing).

[0] = 1; setting this bit initiates the data transfer from the buffer register to the EEPROM (writing process);

it is reset by the I²C master after the data transfer is done.

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