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TLK2201A Datasheet(PDF) 7 Page - Texas Instruments |
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TLK2201A Datasheet(HTML) 7 Page - Texas Instruments |
7 / 21 page TLK2201A, TLK2201AI ETHERNET TRANSCEIVERS SLLS572 – JUNE 2003 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 data reception latency The serial to parallel data latency is the time from when the first bit arrives at the receiver until it is output in the aligned parallel word with RD0 received as first bit. The minimum latency in TBI mode is 21 bit times and the maximum latency is 31 bit times. The minimum latency in DDR mode is 27 bit times and maximum latency is 34 bit times. data reception latency (continued) 10 Bit Code RXP, RXN RD(0–9) RBC0 10 Bit Code td(Rx latency) Figure 6. Receiver Latency – TBI Normal Mode Shown loss of signal detection These devices have a loss of signal (LOS) detection circuit for conditions where the incoming signal no longer has sufficient voltage level to keep the clock recovery circuit in lock. The LOS is intended to be an indication of gross signal error conditions, such as a detached cable or no signal being transmitted, and not an indication of signal coding health. Under a PRBS serial input pattern, LOS is high for signal amplitudes greater than 150 mV. The LOS is low for all amplitudes below 50 mV. Between 50 mV and 150 mV, LOS is undetermined. testability The loopback function provides for at-speed testing of the transmit/receive portions of the circuitry. The enable function allows for all circuitry to be disabled so that an Iddq test can be performed. The PRBS function also allows for a BIST( built-in self test). The terminal setting, TESTEN high, enables the test mode. The terminal TESTEN has an internal pulldown resistor, so it defaults to normal operation. The TESTEN is only used for factory testing, and is not intended for the end-user. loopback testing The transceiver can provide a self-test function by enabling (LOOPEN to high level) the internal loopback path. Enabling this function causes serial transmitted data to be routed internally to the receiver. The parallel data output can be compared to the parallel input data for functional verification. (The external differential output is held in a high-impedance state during the loopback testing.) enable function When held low, ENABLE disables all quiescent power in both the analog and digital circuitry. This allows an ultralow-power idle state when the link is not active. |
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