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| 型號： | DSPCOMMPARALLELUM |
| 英文描述： | Parallel Port Command Converter for DSP User＇s Manual |
| 中文描述： | 并行端口命令轉(zhuǎn)換為數(shù)字信號處理器用戶手冊 |
| 文件頁數(shù)： | 33/70頁 |
| 文件大?。?/td> | 550K |
| 代理商： | DSPCOMMPARALLELUM |
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Motorola
Functional Description
3-1
Chapter 3
Functional Description
The application development system (ADS) user interacts with the target DSP through
two subsystem components, the host computer interface and the command converter
controller. The host computer interface consists of a program written in the C language
that interacts with a host computer bus interface card. The command converter consists of
a program written in DSP56002 assembly language which interacts with the host
computer bus interface card and the target JTAG/OnCE port.
It should be noted that older versions of Motorola DSP products use the OnCE port
protocol, while newer versions of Motorola DSP products use the IEEE JTAG 4-wire
protocol to interact with their OnCE port. New versions of the command converter support
both JTAG and OnCE protocols.
Commands entered from the host computer’s keyboard are parsed and a series of low level
command packets are sent to the command converter. The command converter translates
these low level command packets into serial sequences that are transferred to the target
DSP via its JTAG/OnCE port. The JTAG/OnCE port provides the necessary control to the
target so programs may be loaded or saved, registers read or modified, and hardware
breakpoints set or cleared.
The host computer interface is designed to communicate with as many as eight command
converter cards. This requires a special software protocol to avoid data collisions between
one target and another. The purpose of this section is to describe the subsystem
components of the ADS to give a better understanding of the communication link between
the user and the target DSP.
3.1 Host Computer Hardware
The host computer’s hardware interface provides the communications link between the
user and the command converter. The ADS user interface program uses a software
handshake when communicating with the command converter. There are signals defined
on the host computer bus interface card which are used for requesting and acknowledging
information transfer. Since the handshake is software driven the transfer rate will be
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