BU9458KV Application Note Rev. 0.02
PROPRIETARY AND CONFIDENTIAL
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6/42-
2009/05/28
II. Internal Block Diagram
Figure II.1 shows the BU9458KV internal block diagram.
Figure II.1 Internal Block Diagram
Input from KEY is controlled by KEY Input Controller, and commands from the master micro controller are controlled by
I2C interface. The mode switching terminal port determines which block becomes enabled. A command received by
KEY or I2C interface is analyzed and executed by DSP.
Program
ROM
Fixed Point
Digital Signal Processor
SYS_PLL
USB
controller
SD
controller
Function
Selector
KEY controller
I2C I/F
Work
RAM
Audio
DAC
I2S I/F
S/PDI/F
USB_PLL
Reset
Gen
Status
Registor
X'TAL
16.9344MHz
RESETX
USB
SD Memory
KEY Input
I2C-Bus
I2S output
S/PDI/F
output
LINE OUT
Select
Terminals
Coeff
ROM
Regulator
for
CORE power supply
3.3V
Power
supply
