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IDT79RV308140J

RISController with FPA

Integrated Device Technology 

IDT79R3081 RISController

MILITARY AND COMMERCIAL TEMPERATURE RANGES

PIN DESCRIPTION (Continued):

PIN NAME

Int(5:3)

I/O

DESCRIPTION

I

Processor Interrupt: During normal operation, these signals are logically the same as the Int(5:0) SInt(2:0)

signals of the R3000. During processor reset, these signals perform mode initialization of the CPU, but in a

different (simpler) fashion than the interrupt signals of the R3000.

There are two types of interrupt inputs: the SInt inputs are internally synchronized by the processor, and may

be driven by an asynchronous external agent. The direct interrupt inputs are not internally synchronized, and

thus must be externally synchronized to the CPU. The direct interrupt inputs have one cycle lower latency than

the synchronized interrupts. Note that the interrupt used by the on-chip FPA will not be monitored externally.

ClkIn

Reset

I

Master Clock Input: This input clock can be provided at the execution frequency of the CPU (1x clock mode)

or at twice that frequency (2x clock mode), as selected at reset.

I

Master Processor Reset: This signal initializes the CPU. Mode selection is performed during the last cycle

of Reset.

Rsvd(4:1)

I/O Reserved: These four signal pins are reserved for testing and for future revisions of this device. Users must not

connect these pins. Note that Rsvd(0) of the R3051 is now used for the CohReq input pin.

2889 tbl 04

ABSOLUTE MAXIMUM RATINGS(1, 3)

Symbol

Rating

Commercial Military Unit

VTERM

Terminal Voltage

with Respect

to GND

–0.5 to +7.0 –0.5 to +7.0 V

TC

TBIAS

TSTG

Operating Case

Temperature

0 to +85 –55 to +125 °C

Case Temperature –55 to +125 –65 to +135 °C

Under Bias

Storage

Temperature

–55 to +125 –65 to +155 °C

VIN

Input Voltage

–0.5 to +7.0 –0.5 to +7.0 V

NOTES:

2889 tbl 05

1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS

may cause permanent damage to the device. This is a stress rating only

and functional operation of the device at these or any other conditions

above those indicated in the operational sections of this specification is not

implied. Exposure to absolute maximum rating conditions for extended

periods may affect reliability.

2. VIN minimum = –3.0V for pulse width less than 15ns.

VIN should not exceed VCC +0.5V.

3. Not more than one output should be shorted at a time. Duration of the short

should not exceed 30 seconds.

AC TEST CONDITIONS—R3081

Symbol

Parameter

Min.

VIH

Input HIGH Voltage

3.0

VIL

Input LOW Voltage

—

VIHS

Input HIGH Voltage

3.5

VILS

Input LOW Voltage

—

Max.

—

0

—

0

AC TEST CONDITIONS—RV3081

Symbol

Parameter

Min. Max.

VIH

Input HIGH Voltage

3.0

—

VIL

Input LOW Voltage

—

0

VIHS

Input HIGH Voltage

3.0

—

VILS

Input LOW Voltage

—

0

OUTPUT LOADING FOR AC TESTING

+4mA

Unit

V

V

V

V

2889 tbl 06

Unit

V

V

V

V

2889 tbl 06

RECOMMENDED OPERATING

TEMPERATURE AND SUPPLY VOLTAGE

Grade

Military

Temperature(Case)

–55°C to +125°C

GND

0V

VCC

5.0 ±10%

VREF

–

+1.5V +

Commercial 0°C to +85°C

0V

5.0 ±5%

Commercial 0°C to +85°C

0V

3.3 ±5%

2889 tbl 07

Signal

SysClk

All Others

5.5

To Device

Under Test

CLD

–4mA

CLD

50 pf

25 pf

2889 tbl 08

2889 drw 08

11

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