ADSP-214xx SHARC Processor Hardware Reference 9-41
Digital Application/Digital Peripheral Interfaces
The SRU can be used for this purpose. Table 9-9 describes the different
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
SRU/SRU2 Internal Routing
for Loopback
SRU/SRU2 External Routing for
Loopback
DAI
IDP N/A N/A N/A
SPORT Yes
SPORTx_xx_O
→
SPORTx_xx_I
SPORTx_xx_O → DAI_PBxx_I
DAI_PBxx_O
→ SPORTx_xx_I
S/PDIF
Tx/Rx
No
DIT_O → DIR_I DIT_O → DAI_PBxx_I
DAI_PBxx_O → DIR_I
SRC No
SRCx_DAT_OP_O →
SRCx_DAT_IP_I
SRCx_DAT_OP_O → DAI_PBxx_I
DAI_PBxx_O
→ SRCx_DAT_IP_I
DPI
Timer No
TIMERx_O
→ TIMERx_I TIMERx_O → DPI_PBxx_I
DPI_PBxx_O
→ TIMERx_I
SPI Yes No
SPIx_xx_O
→ DPI_PBxx_I
DPI_PBxx_O
→ SPIx_xx_I
UART0 No
UART0_TX_O →
UART0_RX_I
UART0_TX_O → DPI_PBxx_I
DPI_PBxx_O
→ UART0_RX_I
TWI No No
TWI_xx_O → DPI_PBxx_I
DPI_PBxx_O
→ TWI_xx_I
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