Renesas M30290T2-CPE User Manual page 60

M30290T2-CPE User's Manual
2. Trace window (bus display)
Disassemble display
Source display
REJ10J0494-0200 Rev.2.00 July 16, 2005
Bus display
3. Usage (How to Use the Emulator Debugger)
Explanation of the trace window (bus
display)
The following explains the displayed contents, from left to
right.
- Address
Shows the status of the address bus.
- Data
Shows the status of the data bus.
- BUS
Shows the width of the external data bus. In the present
emulator, only "16b" for 16 bits wide bus is displayed.
- BHE*
Shows the status (0 or 1) of the BHE (Byte High Enable)
signal. If this signal = 0, the odd-address data is valid.
- BIU
Shows the status between the BIU (Bus Interface Unit)
and memory or I/O.
Symbol Status
– Non-active
DMA Data access by other than the CPU, e.g., by
DMA
INT Interrupt acknowledge cycle start
IB Instruction code read by the CPU (in bytes)
DB Data access by the CPU (in bytes)
IW Instruction code read by the CPU (in words)
DW Data access by the CPU (in words)
- R/W
Shows the status of the data bus.
Displayed as "R" for Read, "W" for Write, and "–" for
no access.
- RWT
This is the signal to indicate a valid bus cycle. When
valid, RWT = 0. The Address, Data, and the BIU signals
are effective when this signal is 0.
- CPU
Shows the status between the CPU and BIU (Bus
Interface Unit).
Symbol Status
– Non-active
CB Op-code read (in bytes)
RB Operand read (in bytes)
QC Instruction queue buffer clear
CW Op-code read (in words)
RW Operand read (in words)
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