Freescale-semiconductor StarCore SC140 Instrukcja Użytkownika Pobierz pdf (Strona 136)

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4-26 SC140 DSP Core Reference Manual

EOnCE Module Internal Architecture

The ES block diagram is shown in Figure 4-13.

Figure 4-13. Event Selector Block Diagram

The ES can be used to detect reading or writing data from/to a certain data address by using the EDCD to

detect the data, an EDCA to detect the address (on XABA, XABB, or both), and the ES to generate an

EOnCE event if both events occur. In this case, when both EDCA and EDCD events are selected, only

address and data values on the same bus (A or B) can cause an EOnCE event.

Table 4-10 shows the register set of the ES.

The functionality of the event selector registers is described in Section 4.10, “Event Selector (ES)

Registers.”

4.5.5 Trace Unit

The trace unit is used to store information about a running application without halting its execution. The

user can select the addresses to be stored in the trace unit from a wide selection that includes:

• Change-of-flow instructions

— All Change-of-flow instructions

— Call/return from subroutine instructions

Table 4-10. Event Selector Register Set

ESEL_CTRL ES control register

ESEL_DM ES mask debug state register

ESEL_DI ES mask debug exception register

ESEL_ETB ES mask enable trace register

ESEL_DTB ES mask disable trace register

Debug State

Debug Exception

Enable Trace

Disable Trace

Event0..Event5

EventD

Count event

DEBUGEV

EE[4:0]

External Event6, Event7

1 2 ... 131 132 133 134 135 136 137 138 139 140 141 ... 759 760

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