TC94A04AFG Datasheet, PDF (27/42 Pages) Toshiba Semiconductor – 1 chip Audio Digital Processor

4. Self-Boot Function Description
TC94A04AFG/AFDG
4.1 Self-Boot Function
The TC94A04AFG/AFDG supports a self-boot function for setting coefficients and offsets.
As Figure 1 shows, the data are set via the microcontroller interface circuit.
First saving the data to be set via the microcontroller in the self-boot ROM (SBROM) allows various
modes to be set later. The microcontroller interface circuit supports two format: I²C and the original
mode. However, the boot must be executed in Standard Transmission.
RST
Self-boot Circuit
SBROM
Timing
(512 word × 18 bit) generat
or
BTCSN
BTIFCK
BTIFDI
Microcontroller Interface Circuit
BTMODE
10
Internal
IFDI
10
Internal
IFCK
10
Internal
CSN
Internal
I2CS
Figure 1 Self-Boot System
All the command inputs from the exterior are disregarded during a boot term.
CS
IFCK
IFDI
I2CS
27
2005-09-28