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STA304 + STA500 DIGITAL AUDIO PROCESSOR
EVALUATION BOARD OPERATING MANUAL
1
EVALUATION BOARD
The STA304 Digital Audio Processor is a single chip device implementing end to end digital solution for audio
application. In conjunction with STA500 Power Bridge it gives the full digital DSP-to-Power high quality chain
with no need for Digital-to Analog converters.
The STA304 Evaluation kit is an example for a general application involving all the STA304 and STA500 capa-
bilities, which gives the possibility to evaluate the system performances.
The evaluation kit consists of two boards, and control software. In the first board an STA304 and three STA500
are available, while the second is used to connect the main board to the PC. The control software allows then
to control all the evaluation board capabilities from a simple visual interface.
1.1 LPT Interface (LPT300)
In order to allow proper communication between the 3.3V powered (digital) evaluation board and a standard
LPT interface the STA304 evaluation kit includes also the LPT interface board (LPT300) shown in Figure 1.
Basically the interface will perform a signal level translation between 3.3V and 5V in both directions.
The LPT300 interface take the supply (both 3.3V and 5V) from pins 17 and 18 of the connector J2 (see Figure
2), so no regulators are on board. There is the possibility to have also the regulator on board (U3 and U4), but
in that case the pins 17 and 18 should be disconnected from the STA304 evaluation board. In Figure 2 the com-
ponents that are not needed for LPT300 (such as regulators) are drawn in dashed lines.
IMPORTANT: the LPT300 interface can have some problems if the PC LPT port is configured as "bi-direction-
al". In order to perform a quick test, after the LPT300 is connected to the STA304 board, switch on the supply
and try the "Test procedure" (see the SETUP section). If the test doesn't succeed, try to check the PC parallel
port settings: most PC in fact, can configure their LPT interface in different modes (SPP/EPP/ECP) and it could
happen that some of those configurations are not well suited to control our evaluation kit.
Figure 1. LPT300 Interface Layout
January 2002
www.BDTIC.com/ST
APPLICATION NOTE
by Luca Molinari
- JP1, JP3 open without U3
and U4. Supply from J2
connector
(default
for
LPT300).
AN1456
1/13
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Summary of Contents for ST STA304
- Page 1 2), so no regulators are on board. There is the possibility to have also the regulator on board (U3 and U4), but in that case the pins 17 and 18 should be disconnected from the STA304 evaluation board. In Figure 2 the com- ponents that are not needed for LPT300 (such as regulators) are drawn in dashed lines.
- Page 2 AN1456 APPLICATION NOTE Figure 2. LPT300 interface schematic PWDN AC97_MODE RESET PWRDN THWARN Left THWARN Right THWARN LFE 2/13 www.BDTIC.com/ST...
- Page 3 AN1456 APPLICATION NOTE 1.2 STA304 Evaluation Board The STA304 evaluation board layout is shown in Figure 3. The board has one SPDIF input (differential, electrical single ended, and optical), and two serial inputs. Three serial output are available, as well as five analog power outputs.
- Page 4 Before using the STA304 demo board, the jumper J4 and J5 must be shorted. This jumper could be used to perform current measurement for STA304; in fact, they are in series to all the digital (J4) and the analog (J5) STA304 supply.
- Page 5 AN1456 APPLICATION NOTE Figure 4. For theSTA304 evaluation board schematic 5/13 www.BDTIC.com/ST...
- Page 6 ECP, etc.) and retry the test procedure starting from the RESET. If the test is still fail, check the supply on the LPT interface, and on the STA304 demo board. Try to check also if the I2C signals (SCL, SDA) are moving while the TEST button is pressed. If SDA or SCL are not moving, may- be the LPT interface could be damaged.
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Page 7: Control Software
- If I2S is used, the first two bits of 77h address must be bit 0 = 0, bit 1 = don’t care because it is referred to SPDIF. CONTROL SOFTWARE In order to control and evaluate the STA304 board a dedicated control panel has been developed. It runs on Win95/98 operating system and allows complete DSP control (volume, mute, tone, etc.), full Serial and SPDIF configuration, and demo board status monitoring (thermal warning, SPDIF and sample rate converter lock). - Page 8 1) This 3 radio buttons are used to select from the 3 input interfaces supported by the STA304. 2) Regarding AC97, the software controls only the full compliant bit (if checked the STA304 works in full com- pliant mode as described in the datasheet).
- Page 9 When entering in this page, all the controls are updated reading the STA304 registers. 2.3 Download Page Using this page it is possible to read and download the coefficients in STA304. It is possible also to save and load from file the values.
- Page 10 *256)+ ((unsigned int)dataH *256*256); sprintf(st, "%05x", coe); m_coeff_list.SetItemText(add,1,st); In this case all the coefficients are read, and stored in the table m_coeff_list. The code above is just to show the read/write coefficient procedure, is not intended to show a real application code.
- Page 11 ADD0 must be used, otherwise if SA is tie to Vdd ADD1 must be selected. 3) To put the STA304 in HW power down (all clocks off), or to perform an HW reset, this two button can be used. The HW reset will initialise all the device registers with their default values. To resume an HW power- down the HW reset is mandatory.
- Page 12 Leaving an STA500 output without load while this channel is playing some signal could damage the de- vice. Switch on the STA500 supply only if the STA304 is working and the button in 6 in the main page displays "Turn ON".
- Page 13 This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics 2002 STMicroelectronics - All Rights Reserved ®...
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