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TDA1315 Fiches technique(PDF) 10 Page - NXP Semiconductors |
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TDA1315 Fiches technique(HTML) 10 Page - NXP Semiconductors |
10 / 36 page 1995 Jul 17 10 Philips Semiconductors Product specification Digital audio input/output circuit (DAIO) TDA1315H Whenever MUTE is activated in any of the transmit modes, the audio data of the IEC output signal will be muted and the validity bit set to logic 0, regardless of the INVALID input value. When SDAUX is selected, MUTE will also affect the output at pin SD. Table 2 Summary of validity and muting in the transmit mode Note 1. X = don’t care. INPUT CONDITIONS(1) IEC OUTPUT SIGNAL MUTE ACTIVATED SDAUX SELECTED INVALID INPUT VALIDITY BIT AUDIO BITS No no 0 0 from SD No no 1 1 from SD No yes X 0 from SDAUX Yes X X 0 0 NON-AUDIO SECTION In the non-audio section, the first 30 channel status bits are taken from each block of data. A selection of 16 bits is then assembled as two bytes and transferred to the user interface. In the event of an incorrect IEC signal, i.e. no consumer mode, an error will be flagged at pin CHMODE. The error signal will return to its passive state after a full block of consumer mode data has been received. The user data bits are searched for the beginning of a ‘message’ (see Section “User data”), which is then stored bytewise in a buffer that can be read by an external microcontroller via the user interface. In the transmit mode, channel status and user data bits are taken from an internal buffer that has been written to by an external microcontroller via the user interface. These bits are required for frame composition in the biphase modulator. The non-audio section supports only the consumer mode of the “IEC 958” specification and handles the channel status and user data information. The non-audio section can be operated in the stand-alone mode (receive only) and the host mode (transmit/receive). In the stand-alone mode, a few bits from the channel status are brought out to pins, the user data is not available. In the host mode, channel status and user data are exchanged using a microcontroller. After a RESET in the host mode, the TDA1315H provides general format by default. Channel status The channel status consists of 30 bits, a number of which are reserved for future standardization. The 16 most significant bits (MSBs), arranged as two bytes, are exchanged using an external microcontroller. The mapping of the channel status bits into these two bytes is given in Tables 3 and 4. All SCMS operations (Serial Copy Management System) will be performed in the microcontroller and no manipulation in the TDA1315H is possible. Bit 0 is always the first bit on the user interface. In the receive mode, an error signal is generated at pin CHMODE if a professional mode signal is received. Even then, two bytes of information, mapped as defined in Tables 3 and 4, are generated for output. Although there are two bytes of channel status available for output, only the first byte can be read. To identify future modes of the channel status, both mode bits (bits 6 and 7 in the channel status) are available (inverted) from the TDA1315H status register. The channel status is created from the left channel subframes of the IEC signal (preambles ‘B’ and ‘M’). Whenever the channel status, as defined in Tables 3 and 4 (16 bits), differs from the previously received channel status, a bit will be set in the TDA1315H status register. This helps to reduce the data traffic by enabling the microcontroller to read the channel status only after it has changed. In the transmit mode, the microcontroller supplies consumer mode (Mode 0) channel status data as described in Table 3. Both bytes need to be transferred. |
Numéro de pièce similaire - TDA1315 |
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Description similaire - TDA1315 |
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