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HD-6409 Datasheet(PDF) 5 Page - Intersil Corporation |
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HD-6409 Datasheet(HTML) 5 Page - Intersil Corporation |
5 / 14 page 5 FN2951.3 October 15, 2008 Repeater Operation Manchester Il data can be presented to the repeater in either of two ways. The inputs Bipolar One In and Bipolar Zero In will accept data from differential inputs such as a comparator or sensed transformer coupled bus. The input Unipolar Data In accepts only noninverted Manchester II coded data. The decoder requires a single clock with a frequency 16X or 32X the desired data rate. This clock is selected to 16X with Speed Select low and 32X with Speed Select high. For long data links the 32X mode should be used as this permits a wider timing jitter margin. The inputs UDl, or BOl, BZl are delayed approximately 1/2 bit period and repeated as outputs BOO and BZO. The 2X ECLK is transmitted out of the repeater synchronously with BOO and BZO. A low on CTS enables ECLK, BOO, and BZO. In contrast to the converter mode, a transition on CTS does not initiate a synchronization sequence of eight 0’s and a command sync. The repeater mode does recognize a command or data sync pulse. SD/CDS is an output which reflects the state of the most recent sync pulse received, with high indicating a command sync and low indicating a data sync. When RST is low, the outputs SDO, DCLK, and NVM are low, and SRST is set low. SRST remains low after RST goes high and is not reset until a sync pulse and two valid manchester bits are received with the reset bit low. The reset bit is the first data bit after the sync pulse. With RST high, NRZ Data is transmitted out of Serial Data Out synchronously with the 1X DCLK. FIGURE 2. DECODER OPERATION DCLK UDI SDO RST NVM COMMAND SYNC 10 01 01 0 1 0 1 0 1 0 FIGURE 3. REPEATER OPERATION INPUT COUNT ECLK UDI BZO BOO RST SRST SYNC PULSE 12 3 45 6 7 HD-6409 HD-6409 |
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