Townshend Computer Tools DAT-Link - Appendix C Connectors; C.1 DSP-Port

App endix C
Connectors
C.1 DSP-Port
The DB15 connector on the rear of the DAT-Link +, labelled DSP-Port , provides
access to the DSP32C's serial I/O port. This is similar, but not identical to the
DSP Port found on NeXT computers. The NeXT DSP Port is dened in terms
of the serial I/O found on the Motorola 56000 digital signal processor used in the
NeXT. The DSP32C's serial I/O diers from the 56000 and thus the serial p ort
specication of the DAT-Link +'s DSP-Port is not precisely compatible with the
NeXT DSP Port. However, it do es allow full access to the DSP32C's serial I/O and
is compatible with much of the equipment designed to interface to the NeXT DSP
Port.
The pinout of the DSP-Port is shown in Table C.1 with the pin numbers, the NeXT
DSP Port names for the connections, and the signals used for the DSP32C serial
port. The exact use of pins 4,5, and 6 dep end up on the serial port mo de as describ ed
below.
C.1.1 Conguring the DSP-Port
In order to interface with a variety of peripherals, the DSP-Port can be congured
in a number of ways using the naset command with the -s option. This option
takesakeyword that species the connections b etween the DSP32C, the AES/EBU
transmitter and receiver, and the DSP-Port .
For example, to setup the DAT-Link + to transfer data to and from the DSP-Port
using bit clo cks and load signals (ICK, OCK, ILD, and OLD) generated by the
external equipment, one would use: