M306NKT-EPB User’s Manual 3. Usage (How to Use the Emulator Debugger) REJ10J0519-0200 Rev.2.00 Oct. 16, 2006 Page 67 of 104
3. Trace window (Bus information 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 internal data bus. “16b” for 16 bits bus
wide bus and “8b” for 8 bits bus wide bus are 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
- : No change (non-active)
DMA : Data access except for CPU
INT : Start of INTACK sequence
IB : Instruction code read (bytes) by CPU
DB : Data access (bytes) by CP U
IW : Instruction code read (words) by CPU
DW : Data access (words) by CPU
- 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 (bytes)
RB : Operand read (bytes)
QC : Clears instruction queue buffer
CW : Op-code read (words)
RW : Operand read (words)
- QN
Shows the byte count stored in the instruction queue buffer. The
display range is 0 to 4.
- 76543210
Shows the level of external trace signal input cable EXTIN0 to
EXTIN7.
- h” m’ s: ms. us
Shows the elapsed time after starting the user program.