Analog Devices SHARC ADSP-214 Series Hardware Reference Manual page 471

32
TXSPxA
TRANSMIT DATA
BUFFER
32
HARDWARE
COMPANDING
(COMPRESSION)
SPORTS 0, 2, 4, 6 ONLY
32
TRANSMIT SHIFT
REGISTER
SPTRAN=1
Tx ENABLE
SPORTx_DA_OUT SPORTx_DA_IN
SPORTx_DA
Figure 10-2. Serial Port Block Diagram
Companding the Data Stream
Companding (compressing/expanding) is the process of logarithmically
encoding and decoding data to minimize the number of bits that must be
sent. The processor's serial ports support the two most widely used
ADSP-214xx SHARC Processor Hardware Reference
www.BDTIC.com/ADI
IOD0 BUS
PM/DM DATA BUS
32
RXSPxA
RECEIVE DATA
BUFFER
32
HARDWARE
COMPANDING
(EXPANSION)
SPORTS 1, 3, 5, 7 ONLY
32
RECEIVE SHIFT
REGISTER
SPTRAN=0
Rx ENABLE
SPORTx_CLK
SPORTx_FS
SPORTx_FS
32
32
32
TXSPxB
TRANSMIT DATA
BUFFER
32
TRANSMIT
SHIFT
REGISTER
SPTRAN=1
Tx ENABLE
SPTRAN CNTL
SPORTx_DB_OUT
SERIAL PORT
CONTROL
Serial Ports
32
RXSPxB
RECEIVE DATA
BUFFER
32
RECEIVE
SHIFT
REGISTER
SPTRAN=0
Rx ENABLE
SPORTx_DB_IN
SPORTx_DB
10-13