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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HDMP-0482 датащи(PDF) 2 Page - Agilent(Hewlett-Packard) |
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HDMP-0482 датащи(HTML) 2 Page - Agilent(Hewlett-Packard) |
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2 / 12 page  2 Figure 1. Block Diagram of HDMP-0482. 1 1 0 0 1 2 1 0 3 1 0 4 1 0 5 1 0 6 1 0 7 1 0 0 1 0 BYPASS0 MODE_VDD RFCM REFCLK FSEL AV BYPASS0 MODE_VDD FM_NODE[0]_DV CDR DV The HDMP-0482 design allows for CDR placement at any location with respect to the hard disk slots. For example, if the BY- PASS[0]- pin is floating and hard disk slots A to G are connected to PBC cells 1 to 7, respectively, the CDR function will be performed HDMP-0482 Block Diagram CDR The Clock and Data Recovery (CDR) block is responsible for frequency and phase locking onto the incoming serial data stream and resampling the incoming data based on the recovered clock. An automatic locking feature allows the CDR to lock onto the input data stream without external training con- trols. It does this by continually frequency locking onto the 106.25 MHz reference clock (REFCLK) and then phase locking onto the input data stream. Once bit locked, the CDR generates a high-speed sampling clock. This clock is used to before entering the hard disk at slot A. To obtain a CDR function after slot G, BYPASS[1]- must be floating and hard disk slots A to G must be connected to PBC cells 2,3,4,5,6,7 and 0, respectively. Table 1 shows all possible connections. For configurations where the CDR is before slot A, a Data Valid (FM_NODE[0]_DV) pin indicates whether the incoming data on FM_NODE[0] ± is valid Fibre Channel data. In addition, an Amplitude Valid (FM_NODE[7]AV) pin shows the status of the signal at FM_NODE[7]. sample or repeat the incoming data to produce the CDR output. The CDR jitter specifications listed in this data sheet assume an input that has been 8B/10B encoded. DV Output The Data Valid (DV) block detects if the incoming data on FM_NODE[0] ± is valid Fibre Channel data. The DV checks for sufficient K28.5+ characters (per Fibre Channel framing rules) and for run length violations (per 8B/ 10B encoding) on the data coming out of the CDR. The FM_NODE[0]_DV output is pulled low if a run length viola- tion (RLV) occurs, or if there are no commas detected (NCD) in a sufficient time. It is pulled high if no errors are found. A RLV error is defined as any consecutive sequence of 1s or 0s greater than five in the serial data bit stream. A NCD error indicates the absence of a seven-bit pattern (0011111) present in the positive disparity comma (K28.5+) character. A K28.5+ character should occur at the beginning of every Fibre Channel frame of 2148 bytes (or 21480 serial bits), as well as many times within and between frames. If this seven-bit pattern is not found within a 215 bit (~31 µs) interval, an NCD error is generated. |
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