Figure 15.1 Emulation block diagram
BP registers
Comparators
ST18-AU1
IA
XA / YA
XD / YD
IA
RD/WR
D950
TAP
Control
Registers
Control
Logic
PC trace
ERQ, IDLE, SNAP
The emulation controller interface (see Table 2.12 and Table 2.13 on page 11) includes pins
of different types:
• ERQ, IDLE and SNAP are used by the emulator tools.
• HALTACK indicates that the processor is halted in emulation mode.
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