DIT4192 DIT41 92 SBOS229B – DECEMBER 2001 – REVISED JUNE 2003 192kHz Digital Audio Transmitter FEATURES APPLICATIONS ● COMPLIANT WITH AES-3, IEC-60958, AND EIAJ CP1201 INTERFACE STANDARDS ● SUPPORTS SAMPLING RATES UP TO 192kHz ● SUPPORTS MONO-MODE OPERATION ● ON-CHIP DIFFERENTIAL LINE DRIVER ● FLEXIBLE AUDIO SERIAL INTERFACE: -Master or Slave Mode Operation -Supports I2S, Left-Justified, and Right-Justified Data Formats ● SOFTWARE MODE VIA SERIAL CONTROL INTERFACE: -Block Sized Buffer for Channel Status Data -Auto Increment Mode for Block Sized Write and Read Operations ● HARDWARE MODE ALLOWS OPERATION WITHOUT A MICROCONTROLLER ● CRC CODE GENERATION FOR PROFESSIONAL MODE ● MASTER CLOCK RATE: 128fS, 256fS, 384fS, or 512fS ● +5V CORE SUPPLY (VDD) ● +2.7V TO VDD LOGIC I/O SUPPLY (VIO) ● PACKAGE: TSSOP-28 ● ● ● ● ● ● ● ● ● DIGITAL MIXING CONSOLES DIGITAL MICROPHONES DIGITAL AUDIO WORKSTATIONS BROADCAST STUDIO EQUIPMENT EFFECTS PROCESSORS SURROUND-SOUND DECODERS AND ENCODERS A/V RECEIVERS DVD, CD, DAT, AND MD PLAYERS AUDIO TEST EQUIPMENT DESCRIPTION The DIT4192 is a digital audio transmitter designed for use in both professional and consumer audio applications. Transmit data rates up to 192kHz are supported. The DIT4192 supports both software and hardware operation, which makes it suitable for applications with or without a microcontroller. A flexible serial audio interface is provided, supporting standard audio data formats and easy interfacing to audio DSP serial ports. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. Copyright © 2001-2003, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. www.ti.com ELECTROSTATIC DISCHARGE SENSITIVITY ABSOLUTE MAXIMUM RATINGS(1) Power-Supply Voltage, VDD .............................................................. +6.5V VIO ............................................................... +6.5V Input Current ................................................................................... ±10mA Digital Input Voltage .......................................................... –0.2V to +5.5V Digital Output Voltage ............................................ –0.2V to (VDD + 0.2V) Power Dissipation .......................................................................... 300mW Operating Temperature Range ...................................... –40°C to + 85°C Storage Temperature ..................................................... –55°C to +125°C Lead Temperature (soldering, 5s) ................................................. +260°C Package Temperature (IR re-flow, 10s) ........................................ +235°C This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. NOTE: (1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those specified is not implied. PACKAGE/ORDERING INFORMATION PRODUCT DIT4192 " PACKAGE-LEAD PACKAGE DESIGNATOR(1) SPECIFIED TEMPERATURE RANGE PACKAGE MARKING ORDERING NUMBER TRANSPORT MEDIA, QUANTITY TSSOP-28 PW –40°C to +85°C DIT4192IPW " " " " DIT4192IPW DIT4192IPWR Rails, 50 Tape and Reel, 2000 NOTE: (1) For the most current specifications and package information, refer to our web site at www.ti.com. 2 DIT4192 www.ti.com SBOS229B ELECTRICAL CHARACTERISTICS All specifications at TA = +25°C, VDD = +5V, and VIO = 3.3V unless otherwise noted. DIT4192IPW PARAMETER DIGITAL CHARACTERISTICS Applies to All Digital I/O Except TX+ and TX– High-Level Input Voltage, VIH Low-Level Input Voltage, VIL High-Level Output Voltage, VOH Low-Level Output Voltage, VOL Input Leakage Current OUTPUT DRIVER CHARACTERISTICS Applies Only to TX+ and TX– High-Level Output Voltage, VOH Low-Level Output Voltage, VOL SWITCHING CHARACTERISTICS Master Clock and Reset Master Clock (MCLK) Frequency Master Clock (MCLK) Duty Cycle Reset (RST) Active Low Pulse Width Serial Control Port Timing CCLK Frequency Stereo Mode Mono Mode Serial Control Data Setup Time, tSDS Serial Control Data Hold Time, tSDH CS Falling to CCLK Rising, tCSCR CCLK Falling to CS Rising, tCFCS CCLK Falling to CDOUT Data Valid, tCFDO CS Rising to CDOUT High Impedance, tCSZ Audio Serial Interface Timing SYNC Frequency (or Frame Rate) SYNC Clock Period tSYNCP SYNC High/Low Pulse Width, tSYNCHL SCLK Frequency SCLK Clock Period, tSCLKP SCLK High/Low Pulse Width, tSCLKHL SYNC Edge to SCLK Edge, tSYSK Audio Data Setup Time, tADS Audio Data Hold Time, tADH C, U, and V Input Timing C/U/V Data Setup Time, tCUVS C/U/V Data Hold Time, tCUVH CONDITIONS MIN IO = –4mA IO = +4mA 0.7 • VIO 0 0.8 • VIO 0 IO = –30mA IO = +30mA Power Dissipation PD, Quiescent PD, Power-Down Mode PD, Dynamic (at 192kHz operation) UNITS VIO 0.2 • VIO 1 0.1 • VIO 10 VDD – 0.4 0.4 VDD 0.7 V V 25 60 MHz % ns 128 • fS 64 • fS MHz MHz ns ns ns ns ns ns fS = Sampling Frequency fS = Sampling Frequency 12 8 15 12 12 10 195.3050 40 18 15 15 15 kHz µs µs MHz ns ns ns ns ns 15 15 ns ns 5.12 2.56 25 +4.5 +2.7 +5 +5.5 VDD V V VDD = +5V VDD = +5V VDD = +5V VIO = +3.3V VIO = +3.3V VIO = +3.3V VIO = +5V VIO = +5V 25 2 30 15 15 1.5 250 250 3 µA µA mA µA µA mA µA µA mA VDD = +5V VDD = +5V VDD = +5V 100 100 175 µW µW mW TEMPERATURE RANGE Operating Range Storage Range –40 –55 DIT4192 SBOS229B MAX V V V V µA 40 500 POWER-SUPPLY Operating Voltage VDD VIO Supply Current IDD, Quiescent IDD, Power-Down Mode IDD, Dynamic (at 192kHz operation) IIO, Quiescent IIO, Power-Down Mode IIO, Dynamic (at 192kHz operation) IIO, Power-Down Mode IIO, Quiescent IIO, Dynamic (at 192kHz operation) VDD – 0.7 0 TYP www.ti.com +85 +125 °C °C 3 PIN CONFIGURATION: Software Mode (MODE = 0) Top View TSSOP NC 1 28 MODE CDOUT 2 27 U CCLK 3 26 NC CDIN 4 CS Top View TSSOP CSS 1 28 MODE COPY/C 2 27 U L 3 26 V 25 BLS CLK1 4 25 BLS 5 24 NC CLK0 5 24 BLSM MCLK 6 23 NC MCLK 6 23 EMPH VIO 7 22 INT VIO 7 DGND 8 21 NC DGND 8 21 MONO RXP 9 20 NC FMT0 9 20 MDAT NC 10 19 VDD FMT1 10 19 VDD SCLK 11 18 TX+ SCLK 11 18 TX+ SYNC 12 17 TX– SYNC 12 17 TX– SDATA 13 16 DGND SDATA 13 16 DGND NC 14 15 RST M/S 14 15 RST DIT4192 PIN DESCRIPTIONS: Software Mode 4 PIN CONFIGURATION: Hardware Mode (MODE = 1) PIN NAME 1 2 3 4 5 6 7 NC CDOUT CCLK CDIN CS MCLK VIO 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 DGND RXP NC SCLK SYNC SDATA NC RST DGND TX– TX+ VDD NC NC INT 23 24 25 26 27 28 NC NC BLS NC U MODE DIT4192 22 AUDIO PIN DESCRIPTIONS: Hardware Mode PIN DESCRIPTION No Connection Control Port Data Output, Tri-State Control Port Data Clock Input Control Port Serial Data Input Control Port Chip Select Input, Active LOW Master Clock Input Digital I/O Power Supply, +2.7V to VDD Nominal Digital Ground AES-3 Encoded Data Input No Connection Audio Serial Port Data Clock I/O Audio Serial Port Frame SYNC Clock I/O Audio Serial Port Data Input No Connection Reset Input, Active LOW Digital Ground Transmitter Line Driver Output Transmitter Line Driver Output Digital Core Power Supply, +5V Nominal No Connection No Connection Open Drain Interrupt Output, Active LOW. Requires 10kΩ pull-up resistor to VIO. No Connection No Connection Block Start I/O No Connection User Data Input Control Mode Input. Set MODE = 0 for Software Mode operation. PIN NAME 1 2 CSS COPY/C 3 4 5 6 7 L CLK1 CLK0 MCLK VIO 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 DGND FMT0 FMT1 SCLK SYNC SDATA M/S RST DGND TX– TX+ VDD MDAT MONO AUDIO EMPH BLSM BLS V U MODE PIN DESCRIPTION Channel Status Data Mode Input Copy Protect Input or Channel Status Serial Data Input Generation Status Input Master Clock Rate Selection Input Master Clock Rate Selection Input Master Clock Input Digital I/O Power Supply, +2.7V to VDD Nominal Digital Ground Audio Data Format Control Input Audio Data Format Control Input Audio Serial Port Data Clock I/O Audio Serial Port Frame SYNC Clock I/O Audio Serial Port Data Input Audio Serial Port Master/Slave Control Input Reset Input, Active LOW Digital Ground Transmitter Line Driver Output Transmitter Line Driver Output Digital Core Power-Supply, +5V Nominal Mono Mode Channel Data Selection Input Mono Mode Enable Input, Active HIGH Audio Data Valid Control Input, Active LOW Pre-Emphasis Status Input, Active LOW Block Start Mode Control Input Block Start I/O Validity Data Input User Data Input Control Mode Input. Set MODE = 1 for Hardware Mode Operation. DIT4192 www.ti.com SBOS229B GENERAL DESCRIPTION The DIT4192 is a complete digital audio transmitter, suitable for both professional and consumer audio applications. Sampling rates up to 192kHz are supported. The DIT4192 complies with the requirements for the AES-3, IEC-60958, and EIAJ CP1201 interface standards. Figures 1 and 2 show the block diagrams for the DIT4192 when used in Software and Hardware control modes. The MODE input (pin 28) determines the control model used to configure the DIT4192 internal functions. In Software mode, a serial control port is used to write and read on-chip control registers and status buffers. In Hardware mode, dedicated control pins are provided for configuration and status inputs. The DIT4192 includes an audio serial port, which is used to interface to standard digital audio sources, such as Analog-to-Digital (A/D) converters, Digital Signal Processors (DSPs), and audio decoders. Support for Left-Justified, RightJustified, and I2S data formats is provided. The AES-3 encoder creates a multiplexed bit stream, containing audio, status, and user data. See Figure 3 for the multiplexed data format. The data is then Bi-Phase Mark encoded and output to a differential line driver. The line driver outputs are connected to the transmission medium, be it cable or fiber optics. In the case of twisted-pair or coaxial cable, a transformer is commonly used to couple the driver outputs to the transmission line. This provides both isolation and improved common-mode rejection. For optical transmission, the TX+ (pin 18) driver output is connected to an optical transmitter module. See the Applications Information section of this data sheet for details regarding output driver circuit configurations. RXP U SYNC Audio Serial Port SCLK SDATA Reset Logic RST AES-3 Encoder Serial Control Interface, Control Registers, and Channel Status Data Buffers Line Driver TX+ TX– Clock Generator MCLK Control Port BLS INT FIGURE 1. Software Mode Block Diagram. SYNC SCLK SDATA M/S FMT0 FMT1 Audio Serial Port AES-3 Encoder Line Driver TX+ TX– MCLK RST Reset Logic CUV Data Buffer Clock Generator CLK0 CLK1 BLSM BLS MONO MDAT CSS COPY/C L AUDIO EMPH U V FIGURE 2. Hardware Mode Block Diagram. DIT4192 SBOS229B www.ti.com 5 Start of Channel Status Block Frame 191 X Channel A Frame 0 Channel B Z Channel A Y Frame 1 Channel B X Channel A Y Channel B One Sub-Frame Bits: 0 3 4 Preamble 7 8 Aux Data 27 28 29 30 31 LSB Audio Data MSB V U C P Validity Data User Data Channel Status Data Parity Bit FIGURE 3. AES-3 Frame Format. MASTER CLOCK The DIT4192 requires a master clock for operation. This clock must be supplied at the MCLK input (pin 6). The maximum master clock frequency that may be supplied to MCLK is 25MHz. Table I shows master clock rates for common input sampling frequencies. SAMPLING MASTER CLOCK FREQUENCY (MHz) FREQUENCY (kHz) 128 • fS 256 • fS 384 • fS 512 • fS 22.05 24 32 44.1 48 88.2 96 176.4 192 n/a n/a n/a n/a n/a n/a n/a 22.5792 24.576 5.6448 6.144 8.192 11.2896 12.288 22.5792 24.576 n/a n/a 8.4672 9.216 12.288 16.9344 18.432 n/a n/a n/a n/a 11.2896 12.288 16.384 22.5792 24.576 n/a n/a n/a n/a TABLE I. Master Clock Frequencies for Common Sampling Rates. For Software mode, the master clock frequency selection is programmed using the CLK0 and CLK1 bits in Control Register 02H. For Hardware mode, the CLK0 (pin 5) and CLK1 (pin 4) inputs are used to select the master clock frequency. Table II shows the available MCLK frequency selections. CONTROL BITS OR INPUT PINS CLK1 0 0 1 1 CLK0 0 1 0 1 MASTER CLOCK (MCLK) SELECTION 128 • fS 256 • fS 384 • fS 512 • fS TABLE II. Master Clock Rate Selection for Software and Hardware Modes. 6 RESET AND POWER-DOWN OPERATION The DIT4192 includes a reset input, RST (pin 15), which is used to force a reset sequence. When the DIT4192 is first powered up, the user must assert RST low in order to start the reset sequence. The RST input must be low for a minimum of 500ns. The RST input is then forced high to enable normal operation. For software mode, the reset sequence will force all internal registers to their default settings. In addition, the reset sequence will force all channel status bits to 0 in Software mode. While the RST input is low, the transmitter outputs, TX– (pin 17) and TX+ (pin 18), are forced to ground. Upon setting RST high, the TX– and TX+ outputs will remain low until the rising edge of the SYNC clock is detected at pin 12. Once this occurs, the TX– and TX+ outputs will become active and be driven by the output of the AES-3 encoder. In Software mode, the DIT4192 also includes software reset and power-down bits, located in control register 02H. The software reset bit, RST, and the software power-down bit, PDN, are both active high. AUDIO SERIAL PORT The audio serial port is a 3-wire interface used to connect the DIT4192 to an audio source, such as an A/D converter or DSP. The port supports sampling frequencies up to 192kHz. The port signals include SDATA (pin 13), SYNC (pin 12), and SCLK (pin 11). The SDATA pin is the serial data input for the port. The SCLK pin may be either an input or output, and is used to clock serial data into the port. The SYNC pin may be either an input or output, and provides the frame synchroni- DIT4192 www.ti.com SBOS229B SYNC AND SCLK FREQUENCIES zation clock for the port. The SYNC pin is also used as a data latch clock for the channel status, user, and validity data inputs in Hardware mode, and the user data input in Software mode. The SYNC clock rate is the same as the sampling frequency, or fS. This holds true for both Slave and Master modes. The DIT4192 supports SYNC frequencies up to 192kHz. The SCLK frequency in Slave mode must provide at least one clock cycle for each data bit that is input at SDATA. The maximum SCLK frequency is 128 • fS, or 24.576MHz for fS = 192kHz. The SCLK frequency in Master mode is set by the DIT4192 itself. For Software mode operation, the SCLK rate may be programmed to either 64 • fS or 128 • fS, using the SCLKR bit in Control Register 03HEX. In Hardware mode, the SCLK frequency is fixed at 64 • fS for Master mode. SLAVE OR MASTER MODE OPERATION The audio serial port supports both Slave and Master mode operation. In Slave mode, both SYNC and SCLK are configured as inputs. The audio source device must generate both the SYNC and SCLK clocks in Slave mode. In Master mode, both SYNC and SCLK are configured as outputs. The audio serial port generates the SYNC and SCLK clocks in Master mode, deriving both from the master clock (MCLK) input. AUDIO DATA FORMATS In Software mode, Master/Slave mode selection is performed using the M/S bit in Control Register 03H (defaults to Slave mode). In Hardware mode, the M/S input (pin 14) is used to select the audio serial port mode. This is shown in Table III. The DIT4192 supports standard audio data formats, including Philips I2S, Left-Justified, and Right-Justified data. Software mode provides the most flexible format selection, while Hardware mode supports a limited subset of the Software mode formats. Linear PCM audio data at the SDATA input is typically presented in Binary Two’s Complement, MSB first format. Encoded or non-audio data may be provided as required by the encoding scheme in use. Figure 4 shows the common data formats used by the audio serial port. CONTROL BITS OR INPUT PIN M/S MASTER/SLAVE MODE SELECTION 0 Slave Mode, both SYNC and SCLK are inputs. 1 Master Mode, both SYNC and SCLK are outputs. TABLE III. Master/Slave Mode Selection for Software or Hardware Mode. Left Channel Right Channel SYNC (ISYNC = 0) SYNC (ISYNC = 1) MSB SDATA SDATA SDATA MSB LSB MSB LSB MSB MSB LSB Right Justified Left Justified 0 SCLK Delay LSB MSB LSB LSB Left Justified 1 SCLK Delay (I2S) SCLK (ISCLK = 0) SCLK (ISCLK = 1) tSYNCHL tSYNCHL SYNC tSYSK SCLK tSYSKHL tSCLKHL tSCLKP SDATA tADS tADH FIGURE 4. Audio Data Formats and Timing. DIT4192 SBOS229B www.ti.com 7 For Software mode, Control Register 03H is used to set the audio data format selection. Data word length may be set to 16, 18, 20, or 24 bits using the WLEN0 and WLEN1 bits. Several format parameters, including SCLK sampling edge, data delay from the start of frame, and SYNC polarity may be programmed using this register. Table IV shows examples of register bit settings for three standard audio formats. SCLK sampling edges and SYNC polarity may differ from one system implementation to the next. Consult the audio source device data sheet or technical reference for details regarding the output data formatting. For Hardware mode, the FMT0 (pin 9) and FMT1 (pin 10) inputs are utilized to select one of four audio data formats. Refer to Table V for the available format selections. Hardware mode operation is similar to Software mode operation, with the exception that there are only a limited number of data formats available for the audio serial port. For Leftand Right-Justified formats, BLS behaves as it would in Software mode with ISYNC = 0. For the I2S data format, BLS behaves as it would in Software mode with ISYNC = 1. CHANNEL STATUS DATA INPUT INPUT PINS FMT1 0 0 1 1 falling edge of SYNC when the ISYNC bit is set to 1. If BLS is high when it is sampled, then a block start condition is indicated. When BLS is configured as an output and the ISYNC bit is set to 0, BLS will go high at every 192nd falling edge of SYNC for Stereo mode, or every 384th falling edge of SYNC for Mono mode. BLS will then go low on the following falling edge. If the ISYNC bit is set to 1, then BLS transitions on the rising edge of SYNC. FMT0 0 1 0 1 FORMAT SELECTIONS 24-Bit Left-Justified 24-Bit I2S 24-Bit Right-Justified 16-Bit Right-Justified TABLE V. Audio Data Format Selection for Hardware Mode. AES-3 ENCODER OPERATION The AES-3 encoder performs the multiplexing of audio, channel status, user, and validity data. It also performs BiPhase Mark encoding of the multiplexed data stream. This section describes how channel status, user, and validity data are input to the encoder function. BLOCK START INPUT/OUTPUT The block start is used to indicate the start of a channel status data block, which starts with Frame 0 for the AES-3 data stream. For the DIT4192, the block start signal BLS (pin 25), may be either an input or output. In Software mode, the direction of BLS is set using the BLSM bit in control register 01H (defaults to input). In Hardware mode, the direction of BLS is set by the BLSM input (pin 24). If BLSM = 0, the BLS pin is an input. If BLSM = 1, the BLS pin is an output. For Software mode operation, the block start signal is synchronized to the audio serial port frame sync clock, SYNC (pin 12). When BLS is configured as an input pin, it is sampled on the rising edge of SYNC when the ISYNC bit in control register 03H is set to 0. Otherwise, it is sampled on the Channel status data input is determined by the control mode in use. In Software mode, the channel status data buffer is accessed through the serial control port. Buffer operations are described in detail in the section of this data sheet entitled Channel Status Buffer Operation (Software Mode Only). In Hardware mode, channel status data input is accomplished by one of two user-selectable methods. THE CSS INPUT In Hardware mode, the state of the CSS input (pin 1) determines the function of dedicated channel status inputs. When CSS = 0, the COPY (pin 2), L (pin 3), AUDIO (pin 22), and EMPH (pin 23) inputs are used to set associated channel status data bits. The COPY and L inputs are used to set up copy protection for consumer operation, or indicate that the transmitter is operating in professional mode, without copy protection. The AUDIO input is utilized to indicate whether the data being transmitted is PCM audio data, or non-audio data. The EMPH input is used to indicate whether the PCM audio data has been pre-emphasized using the 50/15µs standard. See Table VI for the available options for these dedicated channel status inputs. When CSS = 1, the channel status data is input in a serial fashion at the C input (pin 2). Data is clocked on the rising and falling edges of the SYNC input (pin 12). All channel status data bits can be written in this mode, allowing greater flexibility than the previous Hardware mode case with CSS = 0. See Figure 5 for the C input timing diagram. CONTROL REGISTER 03H BIT SETTINGS AUDIO DATA Bit Name Function Bit Name FORMATS JUS Justification 0 0 1 Left-Justified Left-Justified Right-Justified Philips I2S Left-Justified Right-Justified Function Bit Name Function Bit Name Function DELAY SCLK Delay ISCLK Sampling Edge ISYNC Phase 1 0 0 1 SCLK Delay 0 SCLK Delay 0 SCLK Delay 0 0 0 Rising Edge Rising Edge Rising Edge 1 0 0 Inverted Noninverted Noninverted TABLE IV. Audio Data Format Selection in Software Mode. 8 DIT4192 www.ti.com SBOS229B INPUT FUNCTION COPY Copy Status L Generation Status COPY 0 0 1 1 AUDIO Status Consumer Mode, PRO = Consumer Mode, PRO = Consumer Mode, PRO = Professional Mode, PRO 0, COPY = 0, L = 0 0, COPY = 0, L = 1 0, COPY = 1, L = 0 = 1, No Copy Protection Audio Data Status AUDIO EMPH L 0 1 0 1 Status 0 Digital (or Linear PCM) Audio Data 1 Non-Audio or Encoded Audio Data Pre-Emphasis Status EMPH Status 0 Pre-emphasis bits are set to indicate 50/15µs Pre-emphasis has been applied. 1 Pre-emphasis bits are set to indicate that no Pre-emphasis has been applied. TABLE VI. Channel Status Data Input for Hardware Mode with CSS = 0. Block Start Frame 191 or 383 Frame 0 SYNC(1) BLS (Input) BLS (Output) 192nd or 384th Falling Edge(1) C, U, or V Data Ch B Data Ch A Data tCUVS Ch B Data Ch A Data tCUVH NOTE: (1) Assumes ISYNC = 0. FIGURE 5. C, U, and V Data Timing. USER AND VALIDITY DATA INPUT The user data bits in the AES-3 data stream allow for a convenient way to transfer user-defined or application specific data to another device containing an AES-3 receiver. The U input (pin 27) is used in both Software and Hardware mode to input the user data in a serial fashion. Figure 5 shows the U input timing diagram. Validity data is used to indicate that a sample is error-free audio data, or that the sample is defective and is not suitable for further processing. In Software mode, the VAL bit in control register 01H is utilized to write the validity data. In Hardware mode, the V input (pin 26) is used to input the validity data in serial fashion. Refer to Figure 5 for V input timing for Hardware Mode. When VAL or V = 0, this indicates that the audio data is valid and suitable for further processing. When VAL or V = 1, then the audio sample is defective and should not be used. DIT4192 SBOS229B www.ti.com 9 CCLK is the data clock for the serial control interface. Data is clocked in at CDIN on the rising edge of CCLK, while data is clocked out at CDOUT on the falling edge of CCLK. Data is clocked MSB first for both CDIN and CDOUT. LINE DRIVER OUTPUTS The DIT4192 includes a balanced line driver. The line driver outputs are TX– (pin 17) and TX+ (pin 18). In Software mode, the line driver input is taken from either the output of the onchip AES-3 encoder, or from an external AES-3 encoded source input at RXP (pin 9). The input source is selected using the BYPASS bit in control register 01H (defaults to the on-chip AES-3 encoder). In Hardware mode, the line driver source is always the on-chip AES-3 encoder. WRITE OPERATION Figure 6 illustrates the write operation for the control port. You may write one register or buffer address at a time, or use the auto-increment capability built into the control port to perform block writes. The register or buffer data is preceded by a 16-bit header, with the first byte being used to configure control port operation and set the starting register or buffer address. The second byte of the header is comprised of “don’t care” bits, which can be set to either 0 or 1 without affecting port operation. The outputs of the line driver will follow the AES-3 encoded data source in normal operation. During a hardware or software reset, or when the device is in power-down mode, the line driver outputs will be forced to ground. The outputs can also be forced to ground at any time in Software mode by setting the TXOFF bit to 1 in control register 01H. The first byte of the header contains two control bits, R/W and STEP, followed by a 6-bit address. For write operations, R/W = 0. The STEP bit determines the address step size for the auto-increment operation. When STEP = 0, the address is incremented by 1. When STEP = 1, the address is incremented by 2. Incrementing by 1 is useful when writing multiple control registers in sequence, or when writing both left and right channel status data in sequence. Incrementing by 2 is useful when writing just one channel of status data in sequence. CONTROL PORT OPERATION (SOFTWARE MODE ONLY) For Software mode operation, the DIT4192 includes a serial control port, which is used to write and read control registers and the channel status data buffer. Port signals include CS (pin 5), CDIN (pin 4), CDOUT (pin 2), and CCLK (pin 3). CS is the active low chip select. This signal must be driven low in order to write or read control registers and the channel status data buffer. The third byte contains the 8-bit data for the register or buffer address pointed to by the first byte of the header. To write a single address location, CS is brought high after the least significant bit of the third byte is clocked into the port. For auto increment mode, CS is kept low to write successive register or buffer addresses. CDIN is the serial data input, while CDOUT serves as the serial data output. The CDOUT pin is a tri-state output, which is set to a high-impedance state when not performing a Read operation, or when CS = 1. Set CS = 1 here to write one register or buffer location. Keep CS = 0 to enable auto-increment mode. CS Header Byte 0 CDIN Register or Buffer Data Byte 1 Byte 2 Byte 3 Byte N CCLK BYTE DEFINITION MSB BYTE 0: R/W STEP A5 LSB A4 A3 A2 A1 A0 Register or Buffer Address Auto-Increment Address Step Size: 0 = Increment Address by 1 1 = Increment Address by 2 Read/Write Control: Set to 1 for Read Operation Byte 1: All 8 bits are Don’t Care. Set 0 or 1. Bytes 2 through N: 8-Bit Register or Buffer data. FIGURE 6. Write Operation Format. 10 DIT4192 www.ti.com SBOS229B READ OPERATION the auto-increment operation. When STEP = 0, the address is incremented by 1. When STEP = 1, the address is incremented by 2. Incrementing by 1 is useful when reading multiple control registers in sequence, or when reading both left and right channel status data in sequence. Incrementing by 2 is useful for reading just one channel of status data in sequence. Figure 7 shows an illustration of the read operation for the control port. You may read one register or buffer address at a time, or use the auto-increment capability built into the control port to perform block reads. A 16-bit header is first written to the port, with the first byte being used to configure control port operation and set the starting register or buffer address. The second byte of the header is comprised of “don’t care” bits, which can be set to either 0 or 1 without affecting port operation. The first output data byte occurs immediately after the 16-bit header has been written. This byte contains the 8-bit data for the register or buffer address pointed to by the first byte of the header. To read a single address location, CS is brought high after the least significant bit of the first data byte is clocked out of the port. For auto-increment mode, CS is kept low to read successive register or buffer addresses. The first byte of the header contains two control bits, R/W and STEP, followed by a 6-bit address. For read operations, R/W = 1. The STEP bit determines the address step size for Set CS = 1 here to read one register or buffer location. Keep CS = 0 to enable auto-increment mode. CS Header Byte 0 CDIN Byte 1 Ignore Until Next High-to-Low Transition of CS Register or Buffer Data Byte 0 High Impedance CDOUT Byte 1 Byte N CCLK BYTE DEFINITION MSB BYTE 0: LSB R/W STEP A5 A4 A3 A2 A1 A0 Register or Buffer Address Auto-Increment Address Step Size: 0 = Increment Address by 1 1 = Increment Address by 2 Read/Write Control: Set to 1 for Read Operation Byte 1: All 8 bits are Don’t Care. Set 0 or 1. Bytes 2 through N: 8-Bit Register or Buffer data. FIGURE 7. Read Operation Format. CS tCSCR tCFCS tSDS CCLK tSDH CDIN CDOUT tCFDO tCSZ FIGURE 8. Serial Port Timing. DIT4192 SBOS229B www.ti.com 11 CONTROL REGISTER DEFINITIONS (SOFTWARE MODE ONLY) When MONO = 1 and MCSD = 0, the MDAT bit is used to select the source for Audio data. When MONO = 1 and MCSD = 1, the MDAT bit is used to select the source for both Audio and Channel Status data. This section defines the control registers used to configure the DIT4192, as well as the status register used to indicate an interrupt source. MCSD Channel Status Data Selection (Defaults to 0) Register 00H: Reserved for Factory Use Bit 7 (MSB) Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 (LSB) 0 0 0 0 0 0 0 0 BLSM When set to 0, Channel A data is used for the A sub-frame, while Channel B data is used for the B sub-frame. When set to 1, use the same channel status data for both A and B sub-frames. Channel status data source is selected using the MDAT bit. Block Start Mode (Defaults to 0) When set to 0, BLS (pin 25) is configured as an input pin. TXOFF Transmitter Output Disable (Defaults to 0) When set to 0, the line driver outputs, TX– (pin 17) and TX+ (pin 18) are enabled. When set to 1, BLS (pin 25) is configured as an output pin. VAL When set to 1, the line driver outputs are forced to ground. Audio Data Valid (Defaults to 0) When set to 0, valid Linear PCM audio data is indicated. When set to 1, invalid audio data or non-PCM data is indicated. Register 02H: Power-Down and Clock Control Register Bit 7 (MSB) Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 (LSB) 0 0 0 0 RST CLK1 CLK0 PDN Register 01H: Transmitter Control Register Bit 7 (MSB) Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 (LSB) TXOFF MCSD MDAT MONO BYPAS MUTE VAL BLSM PDN Power-Down (Defaults to 1) When set to 0, the DIT4192 operates normally. When set to 1, the DIT4192 is powered down, with the line driver outputs forced to ground. MUTE Transmitter Mute (Defaults to 0) When set to 0, the mute function is disabled. CLK[1:0] MCLK Rate Selection These bits are used to select the master clock frequency applied to the MCLK input (pin 6). When set to 1, the mute function is enabled, with Channel A and B audio data set to all 0’s. BYPASS CLK1 0 0 1 1 Transmitter Bypass—AES-3 Data Source for the Output Driver (Defaults to 0) When set to 0, AES-3 encoded data is taken from the output of the on-chip encoder. When set to 1, RXP (pin 9) is used as the source for AES-3 encoded data. MONO When set to 1, the transmitter is set to Mono mode. When set to 0, the DIT4192 operates normally. When set to 1, the DIT4192 is reset. Register 03H: Audio Serial Port Control Register Bit 7 (MSB) Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 (LSB) ISYNC ISCLK DELAY JUS WLEN1 WLEN0 SCLKR M/S Data Selection Bit (Defaults to 0) (0 = Left Channel, 1 = Right Channel) When MONO = 0 and MCSD = 0, the MDAT bit is ignored. M/S When MONO = 0 and MCSD = 1, the MDAT bit is used to select the source for Channel Status data. 12 MCLK Rate 128 • fS 256 • fS (default) 384 • fS 512 • fS Software Reset (Defaults to 0) Mono Mode Control (Defaults to 0) When set to 0, the transmitter is set to Stereo mode. MDAT RST CLK0 0 1 0 1 Master/Slave Mode (Defaults to 0) When set to 0, the audio serial port is set for Slave operation. When set to 1, the audio serial port is set for Master operation. DIT4192 www.ti.com SBOS229B SCLKR Master Mode SCLK Frequency (Defaults to 0) BTI Buffer Transfer Interrupt Status—Active High When set to 0, the SCLK frequency is set to 64 • fS. When User Access (UA) to Transmitter Access (TA) buffer transfers are enabled, and the BTI interrupt is unmasked, this bit will go HIGH when a UA to TA buffer transfer has completed. This will also cause the INT output (pin 22) to be driven Low, indicating that an interrupt has occurred. When set to 1, the SCLK frequency is set to 128 • fS. WLEN[1:0] Audio Data Word Length These bits are used to set the audio data word length for both Left and Right channels. TSLIP JUS WLEN1 0 WLEN0 0 Length 24 Bits (default) 0 1 20 Bits 1 0 18 Bits 1 1 16 Bits Transmitter Source Data Slip Interrupt Status—Active High This bit will go HIGH when either a Data Slip or Block Start condition is detected, and the TSLIP interrupt is unmasked. This will also cause the INT output (pin 22) to be driven LOW, indicating that an interrupt has occurred. The function of this bit is selected using the BSSL bit in control register 05H (defaults Data Slip). Audio Data Justification (Defaults to 0) When set to 0, the audio data is Left-Justified The MBTI and MTSLIP bits are used to mask the BTI and TSLIP interrupts. When masked, these interrupt sources are disabled. with respect to the SYNC edges. When set to 1, the audio data is Right-Justified with respect to the SYNC edges. Register 05H: Interrupt Mask Register DELAY Audio Data Delay from the Start of Frame (Defaults to 0) Bit 7 (MSB) Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 (LSB) 0 0 0 0 0 BSSL MTSLIP MBTI This applies primarily to I2S and DSP frame formats, which use Left-Justified audio data. When set to 0, audio data starts with the SCLK period immediately following the SYNC edge which starts the frame. This is referred to as a zero SCLK delay. When set to 1, the audio data starts with the second SCLK period following the SYNC edge which starts the frame. This is referred to as a one SCLK delay. This is used primarily for the I2S data format. ISCLK MBTI BTI Interrupt Mask. Set to ‘0’ to mask BTI (Defaults to 0). MTSLIP TSLIP Interrupt Mask. Set to ‘0’ to mask TSLIP (Defaults to 0). BSSL TSLIP Interrupt Select (Defaults to 0) When set to 0, the Data Slip condition is used to trigger a TSLIP interrupt. When set to 1, the Block Start condition is used to trigger a TSLIP interrupt. SCLK Sampling Edge (Defaults to 0) When set to 0, audio serial data at SDATA (pin 13) is sampled on rising edge of SCLK. When set to 1, audio serial data at SDATA (pin 13) is sampled on falling edge of SCLK. ISYNC Register 06H: Interrupt Mode Register Bit 7 (MSB) Bit 6 Bit 5 Bit 4 0 0 0 0 Bit 3 Bit 2 TSLIPM1 TSLIPM0 Bit 1 Bit 0 (LSB) BTIM1 BTIM0 SYNC Polarity (Defaults to 0) When set to 0, Left channel data occurs when the SYNC clock is HIGH. BTIM[1:0] BTI Interrupt Mode TSLIPM[1:0] TSLIP Interrupt Mode When set to 1, Left channel data occurs when the SYNC clock is LOW. For both cases, Left channel data always precedes the Right channel data in the audio frame. Register 04H: Interrupt Status Register Bit 7 (MSB) Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 (LSB) 0 0 0 0 0 0 TSLIP BTI DIT4192 SBOS229B www.ti.com These bits are used to select the active state for interrupt operation. BTIM1 or BTIM0 or TSLIPM1 TSLIPM0 Interrupt Operation 0 0 Rising Edge Active (default) 0 1 Falling Edge Active 1 0 Level Active 1 1 Reserved 13 BTD Buffer Transfer Disable (Defaults to 0) When set to 0, User Access (UA) to Transmitter Access (TA) Buffer transfers are enabled. When set to 1, User Access (UA) to Transmitter Access (TA) Buffer transfers are disabled. Register 07H: Channel Status Buffer Control Register bit 7 (MSB) bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 (LSB) 0 0 0 0 0 0 0 BTD CHANNEL STATUS DATA BUFFER OPERATION (SOFTWARE MODE ONLY) The master clock input (MCLK) and the frame synchronization clock input (SYNC) must be active in order to update the channel status buffer in Software mode. When the DIT4192 is initially powered up, the device defaults to power-down mode. When the PDN bit in Register 2 is set to 0 to power up the device, there must be a delay between the time that PDN is set to 0 and the first access to the channel status buffer. This delay allows the SYNC clock to synchronize the AES3 encoder block with the audio serial port. It is recommended that Register 2 be the last control register written in the initialization sequence, followed by a delay (10 milliseconds or longer) before attempting to access the channel status buffer. UPDATING THE CHANNEL DATA STATUS BUFFER The DIT4192 contains two buffers for the channel status data. These are referred to as the Transmitter Access (TA) buffer and the User Access (UA) buffer. Each buffer is 48 bytes long, containing 24 bytes each for channels A and B. The 24 bytes per channel correspond to the channel status block defined in the AES-3 and IEC-60958 specifications. Channel A and B data are interleaved within the buffers, see Tables VII and VIII. The AES-3 encoder internally accesses the TA buffer to obtain the channel status data that is multiplexed into the AES-3 data stream. The user accesses the UA buffer through the control port in order to update the channel status data when needed. The transfer of data from the UA buffer to the TA buffer is managed internally by the DIT4192, but it may be enabled or disabled by the user via a control register. Updating the channel status data buffer involves disabling and enabling the UA to TA buffer transfer using the BTD bit in control register 07H. Figure 9 shows the proper flow for updating the buffer. The BTD bit is normally set to 0, which enables the UA to TA buffer transfer. In order to update the channel status data, the user must write to the UA buffer. To avoid UA to TA data transfer while the UA buffer is being updated, the BTD bit is set to 1, which disables UA to TA buffer transfers. While BTD = 1, the user writes new channel status data to the UA buffer via the control port. Once the UA buffer update is complete, the BTD bit is reset to 0. A new UA to TA buffer transfer will occur during one of the frames 184 through 191, DISABLE UA TO TA BUFFER TRANSFER Set BTD = 1 in Control Register 07H UPDATE THE CS DATA Write Channel Status Data to the UA Buffer ENABLE UA TO TA BUFFER TRANSFER Set BTD = 0 in Control Register 07H NO NO Is the Buffer Transfer Interrupt (BTI) Masked? YES Assume that the Buffer Transfer has completed and that the Channel Status data has been updated. Is the INT output LOW? YES Read Register 04H to verify that the BTI bit is set to 1. The Host has verified that the Buffer Transfer is complete, which completes the Channel Status Data update. FIGURE 9. Flowchart for Updating the Channel Status Buffer. 14 DIT4192 www.ti.com SBOS229B ADDRESS CS BIT 0 (HEX) Byte MSB BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 08 A0 09 0A BIT 7 PRO AUDIO EMPH EMPH EMPH LOCK fS B0 PRO AUDIO EMPH EMPH EMPH LOCK fS fS A1 CH MODE CH MODE CH MODE CH MODE U BIT MGT U BIT MGT U BIT MGT U BIT MGT LSB fS 0B B1 CH MODE CH MODE CH MODE CH MODE U BIT MGT U BIT MGT U BIT MGT U BIT MGT 0C A2 AUX AUX AUX WLEN WLEN WLEN reserved reserved 0D B2 AUX AUX AUX WLEN WLEN WLEN reserved reserved 0E A3 reserved reserved reserved reserved reserved reserved reserved reserved 0F B3 reserved reserved reserved reserved reserved reserved reserved reserved 10 A4 REF REF reserved reserved reserved reserved reserved reserved 11 B4 REF REF reserved reserved reserved reserved reserved reserved 12 A5 reserved reserved reserved reserved reserved reserved reserved reserved 13 B5 reserved reserved reserved reserved reserved reserved reserved reserved 14 A6 Alphanumeric Channel Origin Data (7-Bit ASCII0) for Channel A 15 B6 Alphanumeric Channel Origin Data (7-Bit ASCII0) for Channel B 16 A7 Alphanumeric Channel Origin Data (7-Bit ASCII0) for Channel A 17 B7 Alphanumeric Channel Origin Data (7-Bit ASCII0) for Channel B 18 A8 Alphanumeric Channel Origin Data (7-Bit ASCII0) for Channel A 19 B8 Alphanumeric Channel Origin Data (7-Bit ASCII0) for Channel B 1A A9 Alphanumeric Channel Origin Data (7-Bit ASCII0) for Channel A 1B B9 Alphanumeric Channel Origin Data (7-Bit ASCII0) for Channel B 1C A10 Alphanumeric Channel Destination Data (7-Bit ASCII) for Channel A 1D B10 Alphanumeric Channel Destination Data (7-Bit ASCII) for Channel B 1E A11 Alphanumeric Channel Destination Data (7-Bit ASCII) for Channel A 1F B11 Alphanumeric Channel Destination Data (7-Bit ASCII) for Channel B 20 A12 Alphanumeric Channel Destination Data (7-Bit ASCII) for Channel A 21 B12 Alphanumeric Channel Destination Data (7-Bit ASCII) for Channel B 22 A13 Alphanumeric Channel Destination Data (7-Bit ASCII) for Channel A 23 B13 Alphanumeric Channel Destination Data (7-Bit ASCII) for Channel B 24 A14 Local Sample Address Code (32-Bit Binary) for Channel A 25 B14 Local Sample Address Code (32-Bit Binary) for Channel B 26 A15 Local Sample Address Code (32-Bit Binary) for Channel A 27 B15 Local Sample Address Code (32-Bit Binary) for Channel B 28 A16 Local Sample Address Code (32-Bit Binary) for Channel A 29 B16 Local Sample Address Code (32-Bit Binary) for Channel B 2A A17 Local Sample Address Code (32-Bit Binary) for Channel A 2B B17 Local Sample Address Code (32-Bit Binary) for Channel B 2C A18 Time of Day Code (32-Bit Binary) for Channel A 2D B18 Time of Day Code (32-Bit Binary) for Channel B 2E A19 Time of Day Code (32-Bit Binary) for Channel A 2F B19 Time of Day Code (32-Bit Binary) for Channel B 30 A20 Time of Day Code (32-Bit Binary) for Channel A 31 B20 Time of Day Code (32-Bit Binary) for Channel B 32 A21 Time of Day Code (32-Bit Binary) for Channel A 33 B21 Time of Day Code (32-Bit Binary) for Channel B 34 A22 reserved reserved reserved reserved Rel Flags Rel Flags Rel Flags Rel Flags 35 B22 reserved reserved reserved reserved Rel Flags Rel Flags Rel Flags Rel Flags 36 A23 CRC Check Character for Channel A 37 B23 CRC Check Character for Channel B TABLE VII. Channel Status Buffer Map for Professional Mode (PRO = 1). DIT4192 SBOS229B www.ti.com 15 ADDRESS CS BIT 0 (HEX) Byte MSB 8 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 A0 B0 A1 B1 A2 B2 A3 B3 A4 B4 A5 B5 A6 B6 A7 B7 A8 B8 A9 B9 A10 B10 A11 B11 A12 B12 A13 B13 A14 B14 A15 B15 A16 B16 A17 B17 A18 B18 A19 B19 A20 B20 A21 B21 A22 B22 A23 B23 PRO = 0 PRO = 0 CAT CODE CAT CODE SOURCE SOURCE fS fS reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 AUDIO AUDIO CAT CODE CAT CODE SOURCE SOURCE fS fS reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved COPY COPY CAT CODE CAT CODE SOURCE SOURCE fS fS reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved EMPH EMPH CAT CODE CAT CODE SOURCE SOURCE fS fS reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved EMPH EMPH CAT CODE CAT CODE CH NUM CH NUM CLK ACC CLK ACC reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved EMPH EMPH CAT CODE CAT CODE CH NUM CH NUM CLK ACC CLK ACC reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved MODE MODE CAT CODE CAT CODE CH NUM CH NUM reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved MODE MODE L L CH NUM CH NUM reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved reserved LSB TABLE VIII. Channel Status Buffer for Consumer Mode (PRO = 0). whichever is the first frame to occur after the BTD bit is reset to 0. Once the UA to TA buffer transfer is completed, the buffer transfer interrupt (BTI) will occur, as long as it is unmasked. INTERRUPT SOURCES (SOFTWARE MODE ONLY) The transmitter will ignore any attempt to access the UA buffer during a UA to TA buffer transfer. In addition, the BTD bit may be set to 1 to stop a UA to TA buffer transfer that maybe in progress, if so desired. The DIT4192 can be programmed to generate interrupts for up to three predefined conditions. The interrupt output, INT (pin 22), is set low when a valid interrupt occurs. The interrupt status register, 04H, is then read to determine the source of the interrupt. Status register bits and the INT output pin remain active until the status register is read. Once read, status bits are cleared and the INT pin is pulled high by an external pull-up resistor to VIO. CHANNEL STATUS BUFFER MAP The channel status buffer is organized in accordance with the AES-3 and IEC-60958 standards. See Table VII for the memory map for the UA channel status data buffer for Professional mode. Table VIII shows the memory map for the UA channel status data buffer for Consumer mode. 16 Interrupts may be masked using control register 05H. When masked, the interrupt mechanism associated with a particular status bit is disabled. DIT4192 www.ti.com SBOS229B CHANNEL STATUS BUFFER TRANSFER INTERRUPT This interrupt occurs when a channel status buffer transfer has been completed. The buffer transfer process was described in detail in the previous section of this data sheet. This interrupt may be used by the host to trigger an event to occur after a channel status buffer update. The BTI bit in status register 04H is used to indicate the occurrence of the buffer transfer. The BTI bit, like all other status bits, is active high and remains set until the status register is read. A block start condition occurs when a block start signal is generated either internally by the DIT4192, or when an external block start is received at the BLS input (pin 25). APPLICATIONS INFORMATION This section provides practical information pertinent for designing the DIT4192 into a target application. Circuit schematics are provided as needed. DATA SLIP AND BLOCK START INTERRUPTS TYPICAL APPLICATION DIAGRAMS Unlike the BTI interrupt, which has only one function, the TSLIP interrupt can be set to one of two modes. This is accomplished using the BSSL bit in control register 05H. When BSSL = 0, the TSLIP interrupt is set to indicate a data slip condition. When BSSL = 1, the TSLIP interrupt is set to indicate a block start condition. The TSLIP bit, like all other status bits, is active high and remains set until the status register is read. Figures 10 and 11 illustrate the typical application schematics for the DIT4192 when used in Software and Hardware modes. Figure 10 shows a typical Software mode application, where a microprocessor or DSP interface is used to communicate with the DIT4192 via the serial control port. See Figure 11 for a typical Hardware mode configuration, where the control pins are either hardwired or driven by digital logic in a stand-alone application. A data slip condition may occur in cases where the master clock, MCLK (pin 6), is asynchronous to the audio data source. When BSSL = 0, the TSLIP bit will be set to 1 every time a data sample is dropped or repeated. The recommended component values for power-supply bypass capacitors are shown in Figures 10 and 11. These capacitors should be located as close to the DIT4192 powersupply pins as physically possible. From AES-3 Encoded Data Source (Optional) 9 11 Digital Audio Source (A/D Converter, DSP) 12 13 DIT4192 RXP SCLK TX+ 18 Output Circuit SYNC SDATA TX– Cable or Fiber Optics 17 (See Figs. 12-14) 5 3 4 2 µP or DSP 22 25 27 15 6 28 Audio Master Clock CS CCLK CDIN CDOUT INT +2.7V to VDD BLS C1 U VIO RST DGND MCLK VDD MODE DGND 7 8 19 +5V C2 C1 = C2 = 0.1µF to 1µF 16 10kΩ VIO FIGURE 10. Typical Circuit Configuration, Software Mode. DIT4192 SBOS229B www.ti.com 17 DIT4192 Digital Audio Source (A/D Converter, DSP) 11 12 13 14 9 10 1 2 27 26 3 22 23 24 21 20 Hardwired Control or Dedicated Logic or Host Controlled 15 25 6 5 4 28 Audio Master Clock Generator SCLK SYNC SDATA TX+ 18 Cable or Fiber Optics Output Circuit M/S FMT0 FMT1 CSS COPY/C U V L AUDIO EMPH BLSM MONO MDAT TX– 17 (See Figs. 12-14) +2.7V to VDD C1 VIO RST BLS DGND VDD MCLK CLK0 CLK1 MODE DGND 7 8 19 +5V C2 C1 = C2 = 0.1µF to 1µF 16 VIO FIGURE 11. Typical Circuit Configuration, Hardware Mode. The line driver outputs may be connected to cable or fiber optic transmission media in the target application. Figures 12 and 13 show typical connections for driving either balanced twisted-pair or unbalanced coaxial cable. Either of these connections will support rates up to 192kHz. TX+ 18 T1(1) 1:1 110 1 XLR 5 Figure 14 illustrates the connection to an optical transmitter module, used primarily in consumer applications, such as CD or DVD players. The optical transmitter data rate is limited to 6Mb/s, so it will not support 192kHz data rates. The optical interface is typically reserved for lower rate transmission, such as 44.1kHz or 48kHz. TX+ 2 18 4 Toshiba TOTX173 Optical Transmitter 1 DIT4192 TX– 17 0.1µF 3 8 4 DIT4192 TX– 17 NC 3 NOTE: (1) Scientific Conversion SC937-02 or equivalent. 18 0.1µF 300 1 T1(1) 2:1 TOSLINK APF Interconnect +5V FIGURE 14. Recommended Transmitter Output Circuit for TOSLINK Optical Transmission Over All Plastic Fiber (APF). RCA or BNC 5 DUAL-WIRE OPERATION USING MONO MODE DIT4192 TX– 17 4 8 NOTE: (1) Scientific Conversion SC982-04 or equivalent. FIGURE 13. Recommended Transmitter Output Circuit for Unbalanced, 75Ω Coaxial Cable Transmission. 18 1 8.2kΩ FIGURE 12. Recommended Transmitter Output Circuit for Balanced, 110Ω Twisted-Pair Transmission. TX+ 2 In order to support stereo 192kHz transmission for legacy systems, which utilize AES-3 receivers that operate up to a maximum of 96kHz, it is necessary to use two DIT4192 transmitters in what is referred to as a Dual-Wire configuration. Each transmitter carries data for only one channel in this configuration. DIT4192 www.ti.com SBOS229B Dual-Wire operation requires that each DIT4192 operates in Mono mode, which is supported in both Software and Hardware control modes. In Mono mode, the DIT4192 transmits two consecutive samples of a single channel for both the Channel A and Channel B sub-frames, effectively doubling the sampling rate. The audio serial port channel used for sampling audio and channel status data is selectable in both Software and Hardware control modes. as the source channel for audio and channel status data. Refer to the register definition for details regarding the setting of these bits. In Hardware mode, the MONO (pin 21) and MDAT (pin 20) inputs are used to enable mono mode, as well as selecting the source channel for audio and channel status data. Table IX shows the available options for MONO and MDAT selection. Figure 15 illustrates a simple Hardware mode configuration for implementing Dual-Channel operation using two DIT4192 transmitters. In Software mode, the MONO, MDAT, and MCSD bits in control register 01H are used to select mono mode, as well INPUT FUNCTION MONO Stereo/Mono Mode Selection MONO 0 1 MDAT Status Stereo Mode Mono Mode Mono Mode Audio and Channel Status Data Selection MDAT Status 0 Source is Left Channel for Audio data, and Channel A for CS data. 1 Source is Right Channel for Audio data, and Channel B for CS data. TABLE IX. Mono Mode Configuration Settings for Hardware Mode Operation. VIO 11 12 13 14 ADC DATA LRCK BCK 13 12 11 Master Clock Generator To All Devices 14 SCLK 21 20 MONO MDAT TX+ SYNC DIT4192 SDATA TX– 18 17 Output Circuit Right Channel Output (See Figs. 12-14) M/S SDATA TX+ SYNC DIT4192 SCLK M/S TX– MONO MDAT 21 20 18 17 Output Circuit Left Channel Output (See Figs. 12-14) VIO NOTE: To simplify the drawing, not all pins are shown here. FIGURE 15. Hardware Mode Example for Dual-Channel Transmitter Operation. DIT4192 SBOS229B www.ti.com 19 PACKAGE DRAWING PW (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE 14 PINS SHOWN 0,30 0,19 0,65 14 0,10 M 8 0,15 NOM 4,50 4,30 6,60 6,20 Gage Plane 0,25 1 7 0°– 8° A 0,75 0,50 Seating Plane 0,15 0,05 1,20 MAX PINS ** 0,10 8 14 16 20 24 28 A MAX 3,10 5,10 5,10 6,60 7,90 9,80 A MIN 2,90 4,90 4,90 6,40 7,70 9,60 DIM 4040064/F 01/97 NOTES: A. B. C. D. 20 All linear dimensions are in millimeters. This drawing is subject to change without notice. Body dimensions do not include mold flash or protrusion not to exceed 0,15. Falls within JEDEC MO-153 DIT4192 www.ti.com SBOS229B PACKAGE OPTION ADDENDUM www.ti.com 3-Oct-2003 PACKAGING INFORMATION ORDERABLE DEVICE STATUS(1) PACKAGE TYPE PACKAGE DRAWING PINS PACKAGE QTY DIT4192IPW ACTIVE TSSOP PW 28 50 DIT4192IPWR ACTIVE TSSOP PW 28 2000 (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. 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