Analog Devices SHARC ADSP-214 Series Hardware Reference Manual page 455

The SRU can be used for this purpose.
possible routings based on the peripheral.

The peripheral's loop back mode for debug is independent from
both of the signal routing units.
Table 9-9. Loop Back Routing
Peripheral Loopback
Mode
DAI
IDP N/A
SPORT Yes
S/PDIF No
Tx/Rx
SRC No
DPI
Timer No
SPI Yes
UART0 No
TWI No
ADSP-214xx SHARC Processor Hardware Reference
www.BDTIC.com/ADI
Digital Application/Digital Peripheral Interfaces
SRU/SRU2 Internal Routing
for Loopback
N/A
→
SPORTx_xx_O
SPORTx_xx_I
→
DIT_O DIR_I
SRCx_DAT_OP_O
SRCx_DAT_IP_I
→
TIMERx_O TIMERx_I
No
→
UART0_TX_O
UART0_RX_I
No
Table 9-9 describes the different
SRU/SRU2 External Routing for
Loopback
N/A
SPORTx_xx_O
DAI_PBxx_O
→
DIT_O DAI_PBxx_I
DAI_PBxx_O
→
SRCx_DAT_OP_O
DAI_PBxx_O
→
TIMERx_O
DPI_PBxx_O
→
SPIx_xx_O
DPI_PBxx_O
UART0_TX_O
DPI_PBxx_O
→
TWI_xx_O
DPI_PBxx_O
→
DAI_PBxx_I
→
SPORTx_xx_I
→
DIR_I
→
DAI_PBxx_I
→
SRCx_DAT_IP_I
DPI_PBxx_I
→
TIMERx_I
DPI_PBxx_I
→
SPIx_xx_I
→
DPI_PBxx_I
→
UART0_RX_I
DPI_PBxx_I
→
TWI_xx_I
9-41