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ACS8509 Datasheet(PDF) 27 Page - Semtech Corporation |
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ACS8509 Datasheet(HTML) 27 Page - Semtech Corporation |
27 / 68 page ADVANCED COMMUNICATIONS FINAL DATASHEET Revision 2.00/January 2006 © Semtech Corp. Page 27 www.semtech.com ACS8509 SETS cnfg_ref_source_ frequency This register is used to set up each of the 4 input reference sources. Bits (7:6) of each byte defines the operation undertaken on the input frequency, in accordance with the following key: 00 The input frequency is fed directly into the DPLL. (default). 01 The input frequency is internally divided down to 8 kHz, before being fed into the DPLL. (For high jitter tolerance). 10 Unsupported configuration - do not use. 11 Uses the division coefficient stored in registers 46 and 47 (cnfg_freq_divn) to divide the input by this value prior to being fed into the DPLL. The frequency monitors must be disabled. The divided down frequency should equal 8 kHz. The frequency (3:0) should be set to the nearest spot frequency just below the actual input frequency. The DivN feature works for input frequencies between 1.544 MHz and 100 MHz. Bits (5:4) define which leaky bucket group (0-3) is used, as defined in registers 50 to 5F. (default 00). Bits (3:0) defines the frequency of the reference source in accordance with the following: 0000 8 kHz, 0001 1.544 MHz (SONET)/2.048 MHz (SDH) (as defined by register 34, bit 2) (default SEC4), 0010 6.48 MHz (default <SEC3> when MSTSLVB = 1), 0011 19.44 MHz (default <SEC3> when MSTSLVB=0, and <SEC1> <SEC2>), 0100 25.92 MHz, 0101 38.88 MHz, 0110 51.84 MHz, 0111 77.76 MHz, 1000 155.52 MHz, 1001 2 kHz, 1010 4 kHz. 26 Frequency of reference source <SEC1>. 00000011 27 Frequency of reference source <SEC2>. 00000011 2A Frequency of reference source <SEC3>. 00000010 (MSTSLVB=0) 00000011 (MSTSLVB=1) 2C Frequency of reference source <SEC4>. 00000001 Table 14 Register Description (cont...) Addr. (Hex) Register Name Description Default Value (Bin) |
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