sta015t-013tr STMicroelectronics, sta015t-013tr Datasheet - Page 12

• Manufacturer Part Number: sta015t-013tr
• Description: Mpeg 2.5 Layer Iii Audio Decoder With Adpcm Capability
• Manufacturer: STMicroelectronics

STA015 STA015B STA015T
3.4 ADC Inteface
Beside the serial input interface based on SDI and SCKR lines a 3 wire flexible and user configurable input
interface is also available, suitable to interface with most A/D converters. To configure this interface 4 spe-
cific I
registers description for more details.
3.5 General Purpose I/O Interface
A new general purpose I/O interface has been added to this device (TQFP44 and LFBGA64 only). Actually
only the strobe line is used in ADPCM encoding mode to provide an interrupt; other pins are reserved for
future use. The related configuration register is GPIO_CONF. See the following summary for related pin
usage:
4.0 ADPCM ENCODING: OVERVIEW
According to the previously described interfaces there are 4 ways to manage ADPCM data stream while
encoding. Input interface can be either the serial receiver block (SDI + SCKR + DATA_REQ lines) or the
ADC specific interface.
Output interfaces can be either the I2C bus (with or without interrupt line) or the GPSO high-speed serial
interface (GPSO_REQ + GPSO_ DATA + GPSO_SCKR lines). This result in the following 4 methods to
handle encoding flow:
(*) STA013 Compatible mode
Figure 10.
12/55
ADC I/F (SDI_ADC + LRCK_ADC + SCK_ADC)
ADC I/F (SDI_ADC + LRCK_ADC + SCK_ADC)
SERIAL I/F (SCKR + SDI + DATA_REQ)
SERIAL I/F (SCKR + SDI + DATA_REQ) (*)
2
C registers are available (ADC_ENABLE, ADC_CONF, ADC_WLEN and ADC_WPOS). Refer to
GPIO_STROBE
INPUT (data to encode)
I/ODATA [0]
I/ODATA [7]
..................
Name
GPSO_SCKR
GPSO_DATA
GPSO_REQ
STA015
GPIO strobe line
GPSO I/F (GPSO_REQ + GPSO_DATA +
GPSO_SCKR)
I
GPSO I/F (GPSO_REQ + GPSO_DATA +
GPSO_SCKR)
I
2
2
GPIO data line
C + Interrupt (SCL + SDA +DATA_REQ)
C (polling) (SCL + SDA)
Description
GPSO_SCKR
GPSO_DATA
GPSO_REQ
Output (encoded data)
MCU
D00AU1145
Available on package
TQFP44/LFBGA64
TQFP44/LFBGA64
Dir
.....
I/O
I/O
I/O
SO28/TQFP44
SO28/TQFP44
LFBGA64
LFBGA64