Link ports allow the processor to connect to other processors or peripheral link ports using a simple communication protocol for high-speed parallel data transfer. This peripheral allows a variety of I/O peripheral interconnection schemes to I/O peripheral devices as well as co-processing and multiprocessing schemes. The ADSP-BF6xx processor has four link ports and each supports 8-bit wide data transfers at up to 83 MHz. The link ports are multiplexed as follows.
All Link Ports are identical in their design and have the following common features.
Character devices ---> │ │ <M> Blackfin General Purpose Timers char device interface │ │ │ │ < > Blackfin hardware CRC driver │ │ │ │ < > Blackfin SPORT driver for direct raw access │ │ │ │ <M> Blackfin LINKPORT driver │ │ │ │ [ ] /dev/kmem virtual device support │ │ │ │ Serial drivers --->
root:/> ls /dev/linkport*
/dev/linkport0 /dev/linkport1 /dev/linkport2 /dev/linkport3
linkport_test will send data to linkport1, and receive data from linkport0, then verify the data.
linkport test passed.