- SS-HQ1 Application Notes -
Ver.1.0.0 January 7, 2005
66
EEPROM communication timing
The CXD3172AR communicates with an EEPROM, which is used to store parameter settings. The EEPROMs
recommended by Sony are AK6480AF (Asahi Kasei) and BR9080AF (Rohm). The firmware in the DSP
automatically identifies the EEPROM.
Parameters are assigned in byte increments to EEPROM addresses. Addresses in byte increments are
specified both when reading EEPROM address specifications and writing EEPROM address specifications.
Fig 9.2-2 Overview of Communication Timing when EEPROM Write Request Occurs
The communication sequence and communication start timing for each field are optimally controlled by the
firmware, so you do not need to worry about them. Note that the sequence and timing cannot be customized
by the user.
Please note that if parameter controls (transmission, reception, and EEPROM access) relating to DSP
peripheral ICs are performed through RS-232C communication (SS-HQ1 Control Software) or through an
external microcomputer, the application of the results will be delayed by two fields or longer due delays
resulting from serial communication control and calculations inside the DSP.
VD
Communication
Control
EEPROM Write
Request occurs
Perform
Writing
EVR communication is
performed after EEPROM
communication finishes
EVR
Communi
cation
EVR
Communi
cation
EEPROM
Communi
cation