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TLK2201AJR Datasheet(PDF) 8 Page - Texas Instruments |
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TLK2201AJR Datasheet(HTML) 8 Page - Texas Instruments |
8 / 20 page TLK2201AJR 1.0 Gb to 1.6 Gb SMALL FORMFACTOR ETHERNET TRANSCEIVER SLLS614A − MARCH 2004 − REVISED MAY 2007 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 detailed description (continued) 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 cause 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. PRBS function The TLK2201AJR has a built-in 27−1 PRBS function. When the PRBSEN control bit is set high, the PRBS test is enabled. A PRBS is generated and fed into the 10-bit parallel transmitter input bus. Data from the normal parallel input source is ignored during PRBS test mode. The PBRS pattern is then fed through the transmit circuitry as if it were normal data and sent out to the transmitter. The output can be sent to a (BERT) bit error rate tester or to the receiver of another TLK2201AJR. Since the PRBS is not really random and is really a predetermined sequence of ones and zeros, the data can be captured and checked for errors by a BERT. The TLK2201AJR also has a built-in BERT function on the receiver side that is enabled by PRBSEN. It can receive a PRBS pattern and check for errors, and then reports the errors by forcing the SYNC/PASS terminal low. When PRBS is enabled, RBCMODE is ignored. MODESEL must be low for the PRBS verifier to function correctly. The PRBS testing supports two modes (normal and latched), which are controlled by the SYNC enable input. When SYNCEN is low, the result of the PRBS bit error rate test is passed to the SYNC/PASS terminal. When SYNCEN is high the result of the PRBS verification is latched on the SYNC/PASS output (i.e., a single failure forces SYNC/PASS to remain low). |
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