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DP83849IFVS 数据表(PDF) 83 Page - National Semiconductor (TI) |
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DP83849IFVS 数据表(HTML) 83 Page - National Semiconductor (TI) |
83 / 108 page 83 www.national.com 7.3.10 Link Quality Data Register (LQDR), Page 2 This register provides read/write control of thresholds for the 100Mb Link Quality Monitor function. The register also pro- vides a mechanism for reading current adapted parameter values. Threshold values may not be written if the device is powered-down . Table 52. Link Quality Data Register (LQDR), address 1Eh Bit Bit Name Default Description 15:14 RESERVED 0, RO RESERVED: Writes ignored, read as 0. 13 SAMPLE_PARAM 0, RW Sample DSP Parameter: Setting this bit to a 1 enables reading of current parameter values and initiates sampling of the parameter value. The parameter to be read is selected by the LQ_PARAM_SEL bits. 12 WRITE_LQ_THR 0, RW Write Link Quality Threshold: Setting this bit will cause a write to the Threshold register selected by LQ_PARAM_SEL and LQ_THR_SEL. The data written is con- tained in LQ_THR_DATA. This bit will always read back as 0. 11:9 LQ_PARAM_SEL 0, RW Link Quality Parameter Select: This 3-bit field selects the Link Quality Parameter. This field is used for sampling current parameter values as well as for reads/writes to Threshold values. The following encodings are available: 000: DEQ_C1 001: DAGC 010: DBLW 011: Frequency Offset 100: Frequency Control 8 LQ_THR_SEL 0, RW Link Quality Threshold Select: This bit selects the Link Quality Threshold to be read or written. A 0 selects the Low threshold, while a 1 selects the high threshold. When combined with the LQ_PARAM_SEL field, the following en- codings are available {LQ_PARAM_SEL, LQ_THR_SEL}: 000,0: DEQ_C1 Low 000,1: DEQ_C1 High 001,0: DAGC Low 001,1: DAGC High 010,0: DBLW Low 010,1: DBLW High 011,0: Frequency Offset Low 011,1: Frequency Offset High 100,0: Frequency Control Low 100,1: Frequency Control High 7:0 LQ_THR_DATA 0, RW Link Quality Threshold Data: The operation of this field is dependent on the value of the Sample_Param bit. If Sample_Param = 0: On a write, this value contains the data to be written to the selected Link Quality Threshold register. On a read, this value contains the current data in the selected Link Quality Threshold register. If Sample_Param = 1: On a read, this value contains the sampled parameter value. This value will remain unchanged until a new read sequence is started. |
类似零件编号 - DP83849IFVS |
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类似说明 - DP83849IFVS |
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