UM0805

Block descriptions

Doc ID 16304 Rev 3

13/29

execution to the external trace box and the external box stores this information in a

local buffer. This makes it possible, by stopping the CPU activity, to analyze the actual

program flow. For example, if a particular data abort occurs, you can set a breakpoint

on the data abort location and then, when the breakpoint is reached you can analyze

the trace buffer. With this information, it becomes a simple task to identify the event that

produced the problem.

The following configurations can be selected by setting SW1 bits [3:1].

Please refer to the documentation of the trace box manufacturers for more information on

the ETM interface (www.lauterbach.com, www.agilent.com, www.yokogawa.com).

6.7

A/D interface

Eight analog input lines are provided on the J17 connector. The connector also allows you to

determine the conversion range by setting the conversion limits on pins J17-19 (lower limit)

and J17-1 (upper limit). The default setting is to have pins 1-2 and 19-20 shorted by

jumpers.

In this way the conversion range is set to the maximum value (0 ~ 2.5V with a granularity of

2.44 mV) but by removing the two jumpers and providing different values on pin 1 and 19 it

is possible to reduce the range and thus increase the granularity. For example if you input

1 V on J17-19 and 2 V on J17-1 the range will be 1 V ~ 2 V in steps of less than 1 mV.

In any case the following relationships between the pins should be ensured:

Table 6.

Switch 1 configuration settings

Switch 1

Description

32

1

0

0

0

No debug features available.

0

0

1

The 1st ARM JTAG is connected to J8.

0

1

0

The 2nd ARM JTAG is connected to J8.

0

1

1

Both the ARM JTAGs are connected in a daisy chain on J8.

10

0

The 1st ARM JTAG is connected to J8 and the 2nd ARM JTAG is connected to

J18.

1

0

1

ARM1 ETM bus available on J5 (4-bit demultiplexed mode).

1

1

0

ARM2 ETM bus available on J5 (4-bit demultiplexed mode).

11

1

ARM1 ETM bus available on J5 and ARM2 ETM bus available on J6 (Both in 4-bit

1.

To make the ARM2 ETM bus fully available on J6, the board has to be set up as follows:

1. Populate resistors R48, R49, R50, R51 and R52 with 0 ohm resistors.

2. Remove resistors R93 and R94.

0 V

≤

J17-19

≤

J17 17 ~ 3

≤

J17-1

≤

2.5 V

AGND

≤

Vref_n

≤

ADC_In

channels

≤

Vref_p

≤

AVDD