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LMH0056 Datasheet(PDF) 11 Page - Texas Instruments |
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LMH0056 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 20 page SDI 143 MBPS DATA NO DATA T2 270 MBPS DATA 1485 MBPS DATA 270 MBPS DATA T1 TACQ T2 T2 SDI 270 MBPS DATA NO DATA Lock Detect SD/HD T2 NO DATA 1485 MBPS DATA NO DATA T2 Lock Detect SD/HD TACQ = Acquisition Time, defined in the AC Electrical Characteristics Table T1 = Time from Lock Detect assertion or deassertion until SD/HD output is valid, typically 37 ns (one 27 MHz clock period) T2 = Time from SDI input change until Lock Detect de-assertion, 1 ms maximum. SD/HD output is not valid during this time. T1 T1 TACQ T1 TACQ TACQ T1 T1 TACQ T1 T1 TACQ T1 LMH0056 www.ti.com SNLS236C – AUGUST 2006 – REVISED APRIL 2013 Table 3. Control Functionality LOCK DETECT OUTPUT MUTE BYPASS/AUTO BYPASS DEVICE STATUS 0 1 0 PLL unlocked, reclocker bypassed 1 1 0 PLL locked to supported data rate, reclocker not bypassed X 0 X Outputs muted 0 LOCK DETECT X Outputs muted 1 LOCK DETECT 0 PLL locked to supported data rate, reclocker not bypassed 1 LOCK DETECT 1 PLL locked to supported data rate, reclocker bypassed X 1 1 Outputs not muted, reclocker bypassed SD/HD The SD/HD output indicates whether the LMH0056 is processing SD or HD data rates. It may be used to control another device such as the LMH0002 cable driver. When this output is high it indicates that the data rate is 270 Mbps (or 143 Mbps). When low, the indicated data rate is 1483 or 1485 Mbps. The SD/HD output is a registered function and is only valid when the PLL is locked and the Lock Detect output is high. When the PLL is not locked (the Lock Detect output is low), the SD/HD output defaults to HD (low). The SD/HD output is undefined for a short time after lock detect assertion or de-assertion due to a data rate change on SDI. See Figure 4 for a timing diagram showing the relationship between SDI, Lock Detect, and SD/HD. Figure 4. SDI, Lock Detect, and SD/HD Copyright © 2006–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LMH0056 |
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