Motorola DSP96002 User Manual page 184

10.11 DSP96002 TARGET SITE DEBUG SYSTEM REQUIREMENTS
A typical DSP96002 debug environment consists of a target system where the DSP96002 resides in the
user defined hardware. The debug serial port interfaces to the command convertor over a 6 wire link con-
sisting of the 4 OnCE
the DSP96002 and its associated circuitry.
The command controller acts as the medium between the DSP96002 target system and a host computer.
The host computer interfaces to the controller using a standard RS232 three wire cable or the DSP96002
Application Development System parallel bus. A jumper option on the command controller board selects
which method of communications will be used. This allows a variety of different host computers to commu-
nicate with the controller circuit.
The controller circuit provides several important functions. It acts as a DSP96002 serial debug port driver,
host computer command interpreter, and DSP96002 controller. The DSP96002 acts as a slave when in the
debug mode and provides data only upon request. The controller issues commands based on the host com-
puter inputs from a user interface program which communicates with the user.
10.12 USING THE OnCE
The following notations are used:
ACK = Wait for acknowledge on the DSO pin
CLK = issue 32 clocks to read out data from selected register
10.12.1 Begin Debug Activity
Most of the Debug activities will have the following beginning:
1. ACK
2. Save pipeline information:
1.
2.
3.
4.
5.
6.
3. Read PAB FIFO and fetch/decode info (this step is optional):
1.
2.
3.
4.
5.
10 - 18
0 write the data associated with the command into the
register specified by RS4-RS0
1 read the data contained in the register specified by
RS4-RS0
wires, a ground and reset wire. The reset wire is optional and is only used to reset
Send command READ PDB REGISTER
ACK
CLK
Send command READ PIL REGISTER (instruction latch).
ACK
CLK
Send command READ PAB address for fetch
ACK
CLK
Send command READ PAB address for decode
ACK
DSP96002 USER'S MANUAL MOTOROLA