Differences Between Target Devices And Target Interface Circuits - NEC IE-789136-NS-EM1 User Manual

CHAPTER 4 DIFFERENCES BETWEEN TARGET DEVICES AND TARGET INTERFACE CIRCUITS
This chapter describes differences between the target device's signal lines and the signal lines of the IE-789136-
NS-EM1's target interface circuit.
Although the target device is a CMOS circuit, the IE-789136-NS-EM1's target interface circuit consists of an
emulation CPU, TTL, CMOS-IC, and other emulation circuits.
When the IE system is connected with the target system for debugging, the IE system performs emulation so as to
operate as the actual target device would operate in the target system.
However, some minor differences exist since the operations are performed via the IE system's emulation.
(1) Signals input to or output from the EVA chip and the peripheral EVA chip
(2) Signals input from the target system via a gate
(3) Analog signals
(4) Other signals
The IE-789136-NS-EM1's circuit is used as follows for signals listed in (1) to (4) above.
(1) Signals input to or output from the EVA chip and peripheral EVA chip
The following signals perform the same operations as in the µ PD789104A, 789114A, 789124A, 789134A
Subseries, µ PD78F9116B, and 78F9136B. However, a 1 MΩ pull-down resistor and 100 Ω resistor are inserted
in series.
• Signals related to port 0
• Signals related to port 1
• Signals related to port 2
• Signals related to port 5
(2) Signals input from the target system via a gate
Since the following signals are input via a gate, their timing shows a delay compared to the µ PD789104A,
789114A, 789124A, 789134A Subseries, µ PD78F9116B, and 78F9136B.
• RESET signal
• Signals related to X1
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