at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 71

• Manufacturer Part Number: at91sam9263
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

Figure 12-4. ETM9 Block
12.5.5.2
6249D–ATARM–20-Dec-07
Three-state Sequencer
Address Comparator
Data Comparator
Implementation Details
This section gives an overview of the Embedded Trace resources.
The sequencer has three possible next states (one dedicated to itself and two others) and can
change on every clock cycle. The sate transition is controlled with internal events. If the user
needs multiple-stage trigger schemes, the trigger event is based on a sequencer state.
In single mode, address comparators compare either the instruction address or the data address
against the user-programmed address.
In range mode, the address comparators are arranged in pairs to form a virtual address range
resource.
Details of the address comparator programming are:
Each full address comparator is associated with a specific data comparator. A data comparator
is used to observe the data bus only when load and store operations occur.
A data comparator has both a value register and a mask register, therefore it is possible to com-
pare only certain bits of a preprogrammed value against the data bus.
• The first comparator is programmed with the range start address.
• The second comparator is programmed with the range end address.
• The resource matches if the address is within the following range:
• Unpredictable behavior occurs if the two address comparators are not configurated in the
ARM926EJ-S
Bus Tracker
same way.
Controller
– (address > = range start address) AND (address < range end address)
TAP
Scan Chain 6
Trigger, Sequencer, Counters
Control
Trace
Trace Enable, View Data
FIFO
AT91SAM9263 Preliminary
ETM9
TPS-TPS0
TPK15-TPK0
TSYNC
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