5.5

11

IDT79R3081 RISController

MILITARY AND COMMERCIAL TEMPERATURE RANGES

PIN NAME

I/O

DESCRIPTION

Int(5:3)

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

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.

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.

PIN DESCRIPTION (Continued):

ABSOLUTE MAXIMUM RATINGS

(1, 3)

Symbol

Rating

Commercial

Military

Unit

Terminal Voltage

–0.5 to +7.0

–0.5 to +7.0

V

with Respect

to GND

Operating Case

0 to +85

–55 to +125

°C

Temperature

Case Temperature

–55 to +125

–65 to +135

°C

Under Bias

Storage

–55 to +125

–65 to +155

°C

Temperature

Input Voltage

–0.5 to +7.0

–0.5 to +7.0

V

NOTES:

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.

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

should not exceed 30 seconds.

2889 tbl 05

OUTPUT LOADING FOR AC TESTING

Signal

SysClk

50 pf

All Others

25 pf

2889 tbl 08

Symbol

Parameter

Min.

Max.

Unit

Input HIGH Voltage

3.0

—

V

Input LOW Voltage

—

0

V

Input HIGH Voltage

3.0

—

V

Input LOW Voltage

—

0

V

2889 tbl 06

AC TEST CONDITIONS—RV3081

–

+

To Device

Under Test

–4mA

+4mA

+1.5V

2889 drw 08

AC TEST CONDITIONS—R3081

2889 tbl 06

Symbol

Parameter

Min.

Max.

Unit

Input HIGH Voltage

3.0

—

V

Input LOW Voltage

—

0

V

Input HIGH Voltage

3.5

—

V

Input LOW Voltage

—

0

V

2889 tbl 04

RECOMMENDED OPERATING

TEMPERATURE AND SUPPLY VOLTAGE

2889 tbl 07

Grade

Temperature(Case)

GND

Military

–55

°C to +125°C

0V

5.0

±10%

Commercial

0

°C to +85°C

0V

5.0

±5%

Commercial

0

°C to +85°C

0V

3.3

±5%