Link Ports Dma - Analog Devices ADSP-TS101 TigerSHARC Hardware Reference Manual

Link Ports DMA

Four DMA channels define link ports to internal memory, external mem-
ory, or other link ports transfers. Another four channels define internal
memory, external memory, or other link ports to link ports transfers.
Link Ports DMA Transfer Types
The field in the
TY
be used. Receiving link DMA channels have a receiver
transmitting link DMA channels have a transmitter
Link Port to Internal/External Memory
In order to move data from link ports to internal or external memory, the
receiver must be programmed. The DMA initiates a transfer by mak-
TCB
ing a request of the internal bus. As a result, data is transferred from the
link port to internal or external memory (OFIFO). The
is described in Table 7-13.
Internal/External Memory to Link
Consider the case where the transfer direction is from internal or external
memory to link port.
• Internal memory to Link
The DMA initiates a transfer by requesting data from internal
memory. At this stage, data is loaded to the link port when it is
available on the internal data bus.
• External memory to Link
The DMA initiates an internal transfer to fill up the OFIFO
buffer, and the external port starts an output to the external device
(one or more times depending on the packing mode). Link address
is put into IFIFO with read data, whereupon the IFIFO requests an
ADSP-TS101 TigerSHARC Processor
Hardware Reference
register specifies the type of DMA transfer to
TCBx DP
Direct Memory Access
register, and
TCB
register.
TCB
configuration
TCB
7-63