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DS21458 Datasheet(PDF) 10 Page - Dallas Semiconductor |
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DS21458 Datasheet(HTML) 10 Page - Dallas Semiconductor |
10 / 270 page DS21455/DS21458 Quad T1/E1/J1 Transceivers 10 of 270 The parallel port provides access for control and configuration of all the DS21455/DS21458’s features. The Extended System Information Bus (ESIB) function allows up to eight transceivers, two DS21455s or two DS21458s to be accessed via a single read for interrupt status or other user-selectable alarm status information. Diagnostic capabilities include loopbacks, PRBS pattern generation/detection, and 16-bit loop-up and loop-down code generation and detection. * The JTAG function on the DS21455/DS21458 is a single controller for all four transceivers, unlike the DS21Q55, which has a JTAG controller-per-transceiver architecture. 1.1 Standards § ANSI: T1.403-1995, T1.231-1993, T1.408 § AT&T: TR54016, TR62411 § ITU: G.703, G.704, G.706, G.736, G.775, G.823, G.932, I.431, O.151, O.161 § ETSI: ETS 300 011, ETS 300 166, ETS 300 233, CTR4, CTR12 § Japanese: JTG.703, JTI.431, JJ-20.11 (CMI coding only) |
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