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HEF4755 Datasheet(PDF) 6 Page - NXP Semiconductors |
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HEF4755 Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 12 page 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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