GC4114 Datasheet, PDF(40/45 Page) Texas Instruments

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GC4114 Datasheet, PDF (40/45 Pages) Texas Instruments – QUAD TRANSMIT CHIP

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GC4114 QUAD TRANSMIT CHIP

DATA SHEET REV 1.0

7.7 OUTPUT TEST CONFIGURATION

The following configuration allows the user to debug the output interface to insure that the GC4114 data is

being received properly by the following circuitry. The configuration in the following table will generate a fixed output

sequence of sixteen values which will repeat indefinitely: Note that all coefficients except the last two are zero.

Table 16: Output Test Conï¬guration

Control Registers

Channel, Status and Coefï¬cient Pages

Address

Data

Address

Page 0

Page 1

Page 2

00 (HEX)

6A->EA->6A1 20 (HEX)

00->022

read only

1. After configuring the chip fire off the one shot by setting to EA, then back to 6A.

2. Initialize to 00, send the one shot, wait at least 4N clocks, and then set to 02.

Page 3

To run this test load all control registers and coefficient registers as shown above, then generate the one

shot by setting address 0 to 0xEA and then back to 0x6A, and then enabling the programmable coefficients by

setting address 1 to 0x02. After approximately 256 clock cycles the output will settle out and repeat the following 16

sample sequence (Note the alternating pattern in all bits except the 2 LSBs):

0x5556 0xaaaa 0x5556 0xaaaa 0x5556 0xaaaa 0x5556 0xaaaa

0x5556 0xaaa9 0x5557 0xaaa9 0x5557 0xaaa9 0x5557 0xaaa9

Texas Instruments Inc.

- 36 -

MAY 22, 2000

This document contains information which may be changed at any time without notice

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