AD9557 Datasheet, PDF (88/92 Pages) Analog Devices – Dual Input Multiservice

AD9557
Data Sheet
Table 116. EEPROM Storage Sequence for Reference Input Settings
Address Bits Bit Name
Description
0x0E24
[7:0] Reference inputs
The default value of this register is 0x03, which the controller interprets as a data instruction. Its
decimal value is 3, so this tells the controller to transfer four bytes of data (3 + 1), beginning at the
address specified by the next two bytes. The controller stores 0x03 in the EEPROM and increments
the EEPROM address pointer.
0x0E25 [7:0]
0x0E26 [7:0]
The default value of these two registers is 0x0600. Note that Register 0x0E25 and Register 0x0E26
are the most significant and least significant bytes of the target address, respectively. Because the
previous register contains a data instruction, these two registers define a starting address (in this
case, 0x0600). The controller stores 0x0600 in the EEPROM and increments the EEPROM pointer by 2.
It then transfers four bytes from the register map (beginning at Address 0x0600) to the EEPROM
and increments the EEPROM address pointer by 5 (four data bytes and one checksum byte). The
four bytes transferred correspond to the reference inputs parameters in the register map.
Table 117. Reserved
Address Bits Bit Name
0x0E27 [7:0] Reserved
0x0E28 [7:0] Reserved
0x0E29 [7:0]
Description
Reserved.
Reserved.
Table 118. EEPROM Storage Sequence for REFA Profile Settings
Address Bits Bit Name
Description
0x0E2A [7:0] REFA profile
The default value of this register is 0x26, which the controller interprets as a data instruction. Its
decimal value is 38, so this tells the controller to transfer 39 bytes of data (38 + 1), beginning at
the address specified by the next two bytes. The controller stores 0x26 in the EEPROM and
increments the EEPROM address pointer.
0x0E2B [7:0]
0x0E2C [7:0]
The default value of these two registers is 0x0700. Note that Register 0x0E2B and Register 0x0E2C
are the most significant and least significant bytes of the target address, respectively. Because the
previous register contains a data instruction, these two registers define a starting address (in this
case, 0x0700). The controller stores 0x0700 in the EEPROM and increments the EEPROM pointer by 2.
It then transfers 39 bytes from the register map (beginning at Address 0x0700) to the EEPROM
and increments the EEPROM address pointer by 40 (39 data bytes and one checksum byte).
The 39 bytes transferred correspond to the REFA profile parameters in the register map.
Table 119. EEPROM Storage Sequence for REFB Profile Settings
Address Bits Bit Name
Description
0x0E2D [7:0] REFB profile
The default value of this register is 0x26, which the controller interprets as a data instruction. Its
decimal value is 38, so this tells the controller to transfer 39 bytes of data (38 + 1), beginning at
the address specified by the next two bytes. The controller stores 0x26 in the EEPROM and
increments the EEPROM address pointer.
0x0E2E [7:0]
0x0E2F [7:0]
The default value of these two registers is 0x0740. Note that Register 0x0E2E and Register 0x0E2F
are the most significant and least significant bytes of the target address, respectively. Because the
previous register contains a data instruction, these two registers define a starting address (in this
case, 0x0740). The controller stores 0x0740 in the EEPROM and increments the EEPROM pointer by 2.
It then transfers 39 bytes from the register map (beginning at Address 0x0740) to the EEPROM
and increments the EEPROM address pointer by 40 (39 data bytes and one checksum byte). The
39 bytes transferred correspond to the REFB Profile parameters in the register map.
0x0E30 to [7:0] Reserved
0x0E35
0x0E36 [7:0] I/O update
Reserved.
The default value of this register is 0x80, which the controller interprets as an I/O update instruction.
The controller stores 0x80 in the EEPROM and increments the EEPROM address pointer.
Rev. A | Page 88 of 92