ST18952 datasheet(7/67 Pages) STMICROELECTRONICS

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ST18952

Table 2.7

D950Core control (10 pins)

Table 2.8

Emulation unit (7 pins)

Pin name

Type

Description

RESET

Reset input. Active low.

Initializes the 950-Core to the RESET state.

RESET_OUT

Reset output (system reset). Active low.

Low power input. Active low.

LPACK

Low power acknowledge. Active low.

MODE

Mode selection for Reset.

0: forces reset address to 0x0000

1: forces reset address to 0xFC00

IRD_WR

Program memory read/write indicator.

VCI

Valid coprocessor instruction output.

Asserted low during the instruction cycle preceding a coprocessor instruc-

tion to enable operation of an external coprocessor.

STACKX

X stack read/write instruction flag.

STACKY

Y stack read/write instruction flag.

IDT_EN

I-bus direct transfer enable (to BSU peripheral). Active low.

Pin name

Type

Description

ERQ

Emulator Halt Request. Active low.

Halts program execution and enters emulation mode.

IDLE

Output flag asserted high when the processor is halted due to an emulation

halt request or a valid breakpoint condition.Asserted low when the proces-

sor is not Halted or during execution of an instruction under control of the

emulator.

HALTACK

Halt acknowledge. Active high.

Asserted high when the processor is halted from an Emulator Halt request

or when a valid Breakpoint condition is met.

SNAP

Snapshot. Active high.

Asserted high when executing an instruction if Snapshot mode is enabled.

AXEBP

Enable breakpoint on X address bus when high.

AYEBP

Enable breakpoint on Y address bus when high.

AIEBP_SCAN_EN

Enable breakpoint on I address bus when high.

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