Audio Interface Module (AIM)MCF5253 Reference Manual, Rev. 1Freescale Semiconductor 17-23NOTEEBUOUT1 will output a clock signal just after reset and before they can beconfigured as GPIO. The frequency of the clock output will be CRIN/16.17.6.2.1 Transmit “C” ChannelThe “C” channel includes control bits such as data valid, copy protected, transmitted sample rate etc.17.6.2.2 IEC958 Transmitter Interrupt ConditionsThere are three transmitter interrupt conditions:1. Transmit FIFO underrun2. Transmit FIFO overrun3. Transmit FIFO empty17.6.2.3 IEC958-3 Ed2 and Tech 3250-E Standards ComplianceThe IEC958 transmitter is compliant with IEC958-3 Ed2 and Tech 3250-E documents from internationalIEC standards committee and European Broadcasting Union organizations.The IEC958 transmitter implementation allows any sample frequency. Operation is guaranteed up to amaximum incoming transmit clock of 16MHz. The mark/space ratio of the transmit clock must be equalto or better than 38/62.17.6.2.4 Transmission of U-Channel and CD Subcode DataThe user channel transmitter is intended to assemble the CD subcode stream, and conform to the IEC958CD standard specification. The generation of the data needs to be done in software and loaded intohardware registers. The Audio peripheral has provisions to insert this CD subcode stream into the outgoingTable 17-11. EBUnTxCChannel Registers AddressesAddress Name Width Description ResetValue AccessMBAR2 + 0x28 EBU1TxCChannel132 “C” channel bit settings for IEC958 transmitter —Consumer formatUndefined RWMBAR2 + 0xDC EBU1TxCChannel232Table 17-12. Formatting of EBUOUTn (Consumer “C” Channel)IEC958 Bits11 Ordering of bits in Ebu1TxCChannel1 is MSB sent out first. So, Ebu1TxCChannel1(31) is sent out as IEC958 bit 0.Field Name Description Taken From0–31 CONTROL Relevant data EBUnTXCCHANNEL1(31:0)32–191 – – Always 0
