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HDMP-1034A 데이터시트(PDF) 30 Page - Agilent(Hewlett-Packard) |
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HDMP-1034A 데이터시트(HTML) 30 Page - Agilent(Hewlett-Packard) |
30 / 32 page 30 Nomenclature Changes between HDMP-1032A/34A and HDMP-1022/24 In previous versions of G-Link such as the HDMP-1022/24 each parallel unit of data was called a frame. This has been changed to a word with the HDMP-1032A/ 34A. Frame usually stands for a series of words that form a logical unit. For example, each unit of PPP unit is called a frame. It con- sists of a header and a checksum at the end. The encoded 20 bit entity for the HDMP-1022/24 was composed of a data field and also a control field. This was confusing because the data field contained data frames and control frames. In other words control and data were used in two different con- texts which left the reader to identify which of the two mean- ings was meant. The encoded word was split into a word field and an encoding field. With the HDMP-1032A/34A we have: • control words • data words • word field • ➣ where one may find control words or data words • encoding field In addition with the HDMP-1032A/ 34A, fill frames have been changed to idle words following the custom used in Fibre Channel and Gigabit Ethernet where idles are inserted if no information is being fed to the transmitter. Pin names have been changed to specify if they belong to the transmitter (Tx) or the receiver (Rx). In addition, some names have been changed to names analogous to those used in Fibre Channel and Gigabit Ethernet. Examples are TXCLK instead of STRBIN and RXCLK instead of STRBOUT. A pin cross reference table for the HDMP-1032A/34A & HDMP-1022/24 is provided in the table on the next page. |
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