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TAXIchip Integrated Circuits Technical Manual

TAXI Technical Information Publication #89-Nov ’89

Subject: TAXIchip Error Rate Example

INTRODUCTION

A method was devised to establish a baseline TAXIchip set error rate. A series of tests

were conducted at a transmission rate of 125 MHz at room temperature, and various

power supply voltages. The data collected will be used to determine fiber optic and wire

interconnect BER (Bit Error Rate) tests to be completed at a later date.

METHOD

The test method used the TAXI Transmitters and Receivers to transfer data continu-

ously for at least one thousand hours per pair with different VCC conditions. To imple-

ment this test, five TAXI K2 boards were used. Each board includes a TAXI Transmitter

with a ROM data source, and a Receiver with a ROM data checker to test data integrity

on every byte. They were set up according to the diagrams in Figure 20, and intercon-

nected with AC coupled short coax lines.

In Setup 1, a single power supply with 5 V VCC was attached to TAXI K2 board #1.

Board #1 ran independently with the SEROUT+/– connected to its SERIN+/– with 50

Ω

coaxial cables.

Setup 2 had oscillating voltages (4 V to 6 V) connected to the VCC of TAXI K2 boards #2

and #3. The SEROUT+/– of board #2 were connected to the SERIN+/– of board #3, and

the SEROUT+/– of board #3 connected to the SERIN+/– of board #2, with 50

Ω coaxial

cables, forming two test setups with continually varying power supply voltages.

Setup 3 also uses two power supplies with one set at 4 V and the other at 6 V. These

two power supplies were connected to TAXI K2 boards #4 and #5. The SEROUT+/- and

SERIN+/- were connected in the same configuration as boards #2 and #3 in setup 2 with

Ω coaxial cables.

The power supply voltages used (4 and 6 V) are outside the data sheet specification for

the TAXIchip set. This test was intended to stress the parts and to simulate extreme

temperature and operating conditions.

These five boards were checked regularly, and the error counts were recorded. To verify

that these boards were still running correctly, they were made to fail intentionally and

then reset.

RESULT

The tests were completed after each board ran more than 1,000 hours. The table below

summarizes the results.

Board#

Hours

Errors

Notes

1,606

1,623

Errors occurred between 438–558 hours

1,082

1,607

Errors occurred between 438–558 hours

1,082

* One error can cause multiple error counts. These were assumed to be one error event.

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