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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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GS9001 Fiches technique(PDF) 6 Page - Gennum Corporation |
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GS9001 Fiches technique(HTML) 6 Page - Gennum Corporation |
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6 / 14 page  6 of 14 521 - 38 - 04 NOT RECOMMENDED FOR NEW DESIGNS 7. UES for AP, FF and Ancillary UES is set if the incoming UES is set. Also, i f the incoming data does not have an error data packet, this flag is set. This is to inform the down- stream devices that the data being sent has not been previously checked for data errors. In addition to error flag access through the I 2C interface, selected EDH, EDA, IDH, IDA and UES flags are available on two user programmable output pins. Table 2 (on page 3) shows these error flags and the corresponding input addresses. These flags are available for applications where access to the I 2C interface via microcontroller is not possible or cost effective. These flags give the user immediate warning of transmission related errors either locally or from upstream equipment. In situations where the upstream equipment does not support EDH, a new error data packet is inserted in the data stream as specified in RP165. In this case the UES flag is set for active picture, full field and ancillary data. The EDH, EDA and IDA flags are reset for active picture and full field. For ancillary data, the EDH flag is still reported if there are any checksum errors and the EDA and IDA flags are reset. This is done since the checksums for ancillary data may still be valid without the presence of an error data packet in the data stream. Transmit vs Receive Modes The preceding description refers to the device in Receive mode. In Transmit mode, valid CRC-check words for active picture and full field are inserted and all error flags are reset. Flag Masking Any of the fifteen error flags can be set/reset or made transparent using the I 2C interface. Transparent flags are updated on the occurrence of data errors. Flag masking can be done only when the device is in the receive mode. During transmit mode all error flags are reset. The transmit mode would be used for source equipment and equipment that modifies or processes the data before re-serializing. Programmable Interrupt The interrupt output can be made sensitive to any specific or all error flags. This function is programmed using the sensitivity flags SANC, SFF and SAP as described in the section for I 2C interface WRITE format. Errored Field Counter This 21 bit counter can be used to count the number of fields in which data errors occur. The same set of sensitivity flags used for the programmable interrupt, also control the incrementing of this counter. This counter can be made to increment on the occurrence of any specific type of error flag in a field. Error Reporting Error reporting is meant to provide the information necessary to allow system diagnostics. There are fifteen error flags in total, which are used to identify specific error types. All flags are available to be read or overwritten via the I 2C interface. The definition of these flags and an explanation of how the device handles these flags are described below. The acronyms used are: EDA Error Detected Already EDH Error Detected Here IDH Internal device error Detected Here IDA Internal device error Detected Already UES Unknown Error Status AP Active Picture FF Full Field 1. EDH for AP and FF If the incoming CRC checkword is different from the calculated CRC checkword, the EDH flag is set. 2. EDH for Ancillary If the checksum for the ancillary data does not match the calculated checksum, this flag is set. 3. EDA for AP and FF This flag is generated by summing the incoming EDA flag with the product of the incoming EDH flag and the valid CRC bit. As a result, if the incoming EDH flag is set and the EDA flag has not been set, the EDH flag will be recoded to EDA and then cleared. If the incoming CRC is invalid, then the outgoing EDA flag will be determined by the incoming EDA flag only. This is to support devices in the transmission path that do not generate valid CRC,yet pass only the EDA flags. 4. EDA for Ancillary This flag is the sum of the in-coming EDH and EDA flags for ancillary data. 5. IDH for AP, FF and Ancillary These flags are set by the user through the I 2C serial interface. They can be used to indicate any internal device errors in the vicinity of the device. Examples could be local hardware errors such as a RAM failure or a system diagnostics failure on power- up. 6. IDA for AP, FF and Ancillary This flag is the sum of the incoming IDH and IDA flags for AP, FF and ancillary data. |
Numéro de pièce similaire - GS9001_04 |
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Description similaire - GS9001_04 |
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