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PDP83TG720SWCSTQ1 Datasheet(PDF) 22 Page - Texas Instruments |
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PDP83TG720SWCSTQ1 Datasheet(HTML) 22 Page - Texas Instruments |
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22 / 199 page  7.3 Feature Description 7.3.1 Diagnostic Tool Kit The DP83TG720S-Q1 diagnostic tool kit provides mechanisms for monitoring normal operation, device-level debugging, system-level debugging, fault detection, and compliance testing. This tool kit includes a built-in self- test with PRBS data, various loopback modes, Signal Quality Indicator (SQI), Time Domain Reflectometry (TDR), voltage monitor, temperature monitor, electrostatic discharge monitor, and IEEE 802.3bp test modes. 7.3.1.1 Signal Quality Indicator When the DP83TG720S-Q1 is active, the Signal Quality Indicator may be used to determine the quality of link based on SNR readings made by the device. SQI is presented as a eight-level indication based on the calculated SNR value. Signal quality indication is accessible through the bits [3:1] of register<0x0871>. SQI is continuously monitored by the DP83TG720S-Q1 to allow for real-time link signal quality status. 7.3.1.2 Time Domain Reflectometry Time domain reflectometry helps detecting and estimating the location of OPEN and SHORT faults along a cable. TDR is activated by setting bit[15] = 'b1 in the register[0x001E]. When TDR diagnostic process gets completed successfully, Bit[1:0] of register[0x001E] will become 'b10. After this status change, TDR results can be read in the register of following table. Table 7-1. TDR Result Registers : 0x030F Register Bits Description [1:0] • 01 = TDR Activation • 10 = TDR On • 00,11 = TDR Not Available [3:2] Reserved [7:4] • 0011 = Short • 0110 = Open • 0101 = Noise • 0111 = Cable OK • 1000 = Test in progress; initial value with TDR ON • 1101 = Test not possible (e.g. noise; active link) • Other values are not valid [13:8] • Fault distance = Value in decimal of [13:8] • 'b111111 = Resolution not possible/out of distance [15:14] Reserved Note TDR should not be run if the link is already active. Running TDR on active line can make TDR fail and also can result in disruption of link. 7.3.1.3 Built-In Self-Test For Datapath The DP83TG720S-Q1 incorporates a data-path’s Built-In-Self-Test (BIST) to check the PHY level and system level data-paths. BIST has following integrated features which make the system level data transfer tests (through-put etc) and diagnostics possible without relying on MAC or external data generator hardware/software. 1. Loopback modes 2. Data generator a. Customizable MAC packets generator. b. Transmitted packet counter. c. PRBS stream generator. DP83TG720S-Q1 SNLS604 – SEPTEMBER 2020 www.ti.com 22 Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated |
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