Cirrus-logic EP73xx Manual de usuario descargar pdf (Pagina 144)

16-20 EP7309/11/12 User’s Manual - DS508UM4

DAI/CODEC/SSI2

RCNE:

The Right Channel Receive FIFO Not Empty Flag (RCNELCNF) is a read-only bit

which is set when ever the Right Channel Receive FIFO contains one or more entries

of valid data and is cleared when it no longer contains any valid data. This bit can be

polled when using programmed I/O to remove remaining data from the receive

FIFO. This bit does not request an interrupt.

FIFO:

The FIFO Operation Completed (FIFO) Flag is set afterthe FIFO operation requested

by writing to DAIDR2 as completed. FIFO is automatically cleared when DAIDR2 is

read or written. This bit does not request an interrupt.

SSI2 Registers

Synchronous Serial Interface 2 Data Register (SS2DR)

Address: 0x8000.1500

Definition: This is the 16-bit-wide data register for the full-duplex master/slave

SSI2 synchronous serial interface. Writing data to this register will

initiate a transfer. Writes need to be word writes and the bottom 16

bits aretransferred to the TX FIFO. Reads will be 32 bits as well with

the lower 16 bits containing RX data, and the upper 16-bits should

beignored.Although theinterfaceisbyte-oriented,data is writtenin

two bytes at a time toallow higherbandwidth transfer. Itis up to the

software to assemble the bytes for the data stream in an appropriate

manner.

Note: All reads/writes to this register must be word reads/writes.

Synchronous Serial Interface 2 Pop Residual Byte (SS2POP)

Address: 0x8000.16C0, Read / Write

Definition: This is a write-only location which will cause the contents of the RX

shift register to be popped into the RX FIFO, thus enabling a residual

byte to be read. The data value written to this register is ignored.

This location should be used in conjunction with the RESVAL and

RESFRM bits in the SYSFLG2 register.

CODEC Register

CODEC Interface Data Register (CODR)

Address: 0x8000.0440, Read / Write

Definition: The CODR register is an 8-bit read/write register, to be used with

the codecinterface. This isselected by theappropriate setting of bit0

(SERSEL)of the SYSCON2 register. Data written to orread from this

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Cirrus-logic EP73xx Manual de usuario Pagina 144