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HEF4755VD Datasheet(PDF) 6 Page - NXP Semiconductors

Part # HEF4755VD
Description  Transceiver for serial data communication
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

HEF4755VD Datasheet(HTML) 6 Page - NXP Semiconductors

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January 1995
6
Philips Semiconductors
Product specification
Transceiver for serial data communication
HEF4755V
LSI
FUNCTIONAL DESCRIPTION
General
The HEF4755V is used for protected-bit serial data
communication. This protection makes it necessary to
subdivide the serial data stream into data blocks called
messages.
Messages
In the synchronous mode the HEF4755V will transmit or
receive a message as follows:
The first bit of a transmitted message is the start-bit which
cannot be mis interpreted. It instructs the receiver, that
information transfer has started and it defines the
time-window for the following bits. The start-bit is only
necessary in the asynchronous mode and it is omitted in
the synchronous mode. The first byte contains the number
of data bytes that will follow. This byte is checked by the
receiver and if a discrepancy is found, the receiver reports
a code-error. This first byte is called ‘size’. The number of
data bytes can also be fixed by wiring of the transmitter as
well as the receiver. In this case the size byte is omitted.
There is no protocol on the information of the data bytes,
so the maximum number of informations per message is
256
≈ 1017.
The redundancy check byte secures the data bytes
against transmission errors. This byte is calculated in
parallel to the data stream and it is send as last byte by the
transmitter. The receiver calculates its own redundancy
byte and compares it with the received one. If there is a
discrepancy, the receiver reports a code error.
Code protection
Size
The coding of the size byte is as follows:
DIO0 = C
DIO1 = B
n = C
⋅ 22 + B ⋅ 21 + A ⋅ 20
DIO2 = A
DIO3 = P
= C
⊕ B ⊕ A
The information is transmitted as follows:
With this, a hamming distance of 4 is obtained.


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