Ic Functions; Led Functions; Reset; Self-Boot - Analog Devices EVAL-ADAU1401EBZ User Manual

Evaluation Board User Guide

IC FUNCTIONS

Table 4 explains the function of each IC on the evaluation
board. The Lattice CPLD (U2) is only used for routing signals
on the board and performs no decoding or signal conditioning.
Table 4. IC Functions
Reference
Designator Function
U1 ADAU1401 SigmaDSP audio processor
U2 Lattice M4A3-64/32 CPLD for signal routing
U3 AD8608 quad op amp for analog audio output
buffering
U4 CS8416 S/PDIF receiver
U5 74LVC541 for buffering serial output signals
U6 CS8406 S/PDIF transmitter
U8 ADP3336-3 regulator—3.3 V analog supply
U10 ADM811RART
U11 Unused
U12 74LVC1G240 inverter
U14 Self-boot EEPROM: 32 kB × 8 (256 kB)
U18 Unused
U19 Unused
U20 Unused

LED FUNCTIONS

D11 indicates that the 3.3 V supply is present through an
external supply.
reset generator

RESET

The evaluation board can be reset with a push-button switch,
S1. This active-low reset signal is debounced by the
(U10). This reset signal affects the ADAU1401 and S/PDIF
receiver and transmitter. The board may also be reset by
disconnecting the power. After reset, the
pass audio, and a control port write has to be performed so that
signals are output again.

SELF-BOOT

The self-boot function of the ADAU1401 can be set up on the
evaluation board. This allows the ADAU1401 to boot itself from
EEPROM U14 when it is brought out of reset. The ADAU1401 is
the master on the I
another bus master device may take control afterwards.
The first step in setting up self-boot mode is to load a program
from SigmaStudio into the EEPROM. This is done by using the
Load latest compilation to EEPROM function found by right-
clicking on the IC in the Hardware Configuration window.
This should be done while the S3-1 self-boot switch is set low
(right). Note that the jumper should not be on LK7 for this
operation because the EEPROM cannot be write-protected.
After the program is saved, Switch S3-1 can be set high (left),
which sets the ADAU1401 into self-boot mode the next time it
is powered on or reset.
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ADAU1401
2
C bus during the self-boot operation; however,
UG-072
ADM811
does not