參數(shù)資料
型號: ARM966E-S
英文描述: ARM966E-S Microprocessor Core preliminary technical manual 6/01
中文描述: ARM966E - ?微處理器核的初步技術(shù)手冊6月1日
文件頁數(shù): 129/166頁
文件大?。?/td> 1145K
代理商: ARM966E-S
Breakpoints, Watchpoints, and External Debug Requests
Rev. A
Copyright 1999-2001 by LSI Logic Corporation. All rights reserved.
10-13
10.4.4 Watchpoints and Exceptions
If there is an abort with the data access as well as a watchpoint, the
watchpoint condition is latched, the exception entry sequence performed,
and then the processor enters the debug state. If there is an interrupt
pending, the ARM9E-S core allows the exception entry sequence to
occur and then enters the debug state.
10.4.5 Debug Request
A debug request can take place through the EmbeddedICE-RT logic or
through assertion of the EDBGRQ signal. The request is synchronized
and passed to the processor. A debug request takes priority over any
pending interrupt. Following synchronization, the core enters the debug
state when the instruction at the Execute stage of the pipeline is
completed (when Memory and Write stages of the pipeline have
completed). While waiting for the instruction to finish executing, no more
instructions are issued to the Execute stage of the pipeline.
Caution:
Asserting EDBGRQ in monitor mode results in
unpredictable behavior.
10.4.6 Actions of the ARM9E-S Core in Debug State
When the ARM9E-S core is in the debug state, both memory interfaces
indicate internal cycles, which ensures that both the tightly coupled
SRAM within the ARM966E-S and the AHB interface are quiescent. The
rest of the AHB system can thus ignore the ARM9E-S processor core
and function as normal. Because the rest of the system continues
operation, the ARM9E-S processor core ignores aborts and interrupts.
The nRESET signal must be held stable during debug. If the system
applies a reset to the ARM966E-S (nRESET is driven LOW), the
ARM9E-S processor changes state without the knowledge of the
debugger.
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