HCS410 datasheet(14/46 Pages) MICROCHIP

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HCS410

DS40158F-page 14

FIGURE 2-17: DECODER IFF COMMANDS AND WAVEFORMS

ACK pulses

Opcode

Transport

Code

32 bits

Writing

TBITC

Data

16 bits

TOTD

TTTD

TWR

Only when writing Serial

Number, Config or IFF

programming

Serial number

1 to 32 bits

Encoder

Select

ACK

ACK pulses

Challenge

16/32 bits

Response

16/32 bits

ACK pulses

Opcode

TOTD

Response

Start

TRT

16 bits

Ack pulses

Read

Write/Program

Challenge

Encoder Select

2 TE

Repeat 18 times for programming

3TE 3TE

TWR

Preamble

TABLE 2-3:

IFF TIMING PARAMETERS

Parameter

Symbol

Minimum

Typical

Maximum

Units

Time Element

IFFB = 0

IFFB = 1

—

200

100

—

μs

PPM Command Bit Time

Data = 1

Data = 0

TBITC

3.5

5.5

—

PPM Response Bit Time

Data = 1

Data = 0

TBITR

—

PPM Command Minimum High Time

TPMH

1.5

—

Response Time (Minimum for Read)

TRT

6.5

—

Opcode to Data Input Time

TOTD

1.8

—

Transport Code to Data Input Time

TTTD

6.8

—

IFF EEPROM Write Time (16 bits)

TWR

——

40158F.book Page 14 Wednesday, June 1, 2011 10:36 AM

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