8.4. Scan chains

ARM946E-S supports 32 scan chains. Three scan chains are used inside ARM946E-S. These allow testing, debugging, and programming of the EmbeddedICE macrocell watchpoint units.

The supported scan chains are listed in Table 8.2.

Table 8.2. ARM946E-S scan chain allocations

Scan chain

number

Function

0

Reserved

1

Debug

2

EmbeddedICE-RT logic

programming

3

External boundary scan

4 to 14

Reserved

15

Control coprocessor

16 to 31

Unassigned

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