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GS12190 Datasheet(PDF) 49 Page - Semtech Corporation |
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GS12190 Datasheet(HTML) 49 Page - Semtech Corporation |
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49 / 121 page  GS12190 Final Data Sheet Rev.3 PDS-061916 May 2020 49 of 121 Semtech Proprietary & Confidential www.semtech.com 4.8.4 Amplitude and Pre-Emphasis Control The two output drivers offer very granular amplitude and pre-emphasis control. For optimal loss compensation, both the pre-emphasis pulse amplitude and the pre-emphasis pulse width can be independently configured on both output drivers. This extra flexibility provides a mechanism to better shape the pre-emphasis gain to match the frequency loss response of interconnect composed of trace, connector and via losses. The swing and pre-emphasis can be independently configured for specific data rates. Note: Output 0 references the Cable Driver, and Output 1 references the Trace Driver. The output swing on the Cable Driver can be configured for the following three rate groups: • CFG_OUTPUT0_CD_SD_DRIVER_SWING (MADI and SD) • CFG_OUTPUT0_CD_HD_DRIVER_SWING (HD and 3G) • CFG_OUTPUT0_CD_UHD_DRIVER_SWING (6G and 12G) The output pre-emphasis on the Cable Driver can be configured for the following two rate groups: • CFG_OUTPUT0_CD_HD_PREEMPH_WIDTH (HD and 3G) • CFG_OUTPUT0_CD_HD_PREEMPH_AMPL (HD and 3G) • CFG_OUTPUT0_CD_UHD_PREEMPH_WIDTH (6G and 12G) • CFG_OUTPUT0_CD_UHD_PREEMPH_AMPL (6G and 12G) The output driver swing and pre-emphasis will use the rate specific swing configuration when the reclocker is locked to that rate. The default swing setting is ~800mVpp single-ended into an external 75Ω load, and is adjustable in each of the output swing parameters listed above. The Cable Driver supply is pin 25 (VCCO_0) and should be connected to a 2.5V supply. The default pre-emphasis settings provide minimal insertion loss compensation. The Trace Driver amplitude can be configured to use the same swing for all rates, or similarly to the Cable Driver, can have a specific swing for each rate. The following registers allow a per rate swing to be configured for five rates: • CFG_OUTPUT1_TD_SD_DRIVER_SWING (SD) • CFG_OUTPUT1_TD_HD_DRIVER_SWING (HD) • CFG_OUTPUT1_TD_3G_DRIVER_SWING (3G) • CFG_OUTPUT1_TD_6G_DRIVER_SWING (6G) • CFG_OUTPUT1_TD_12G_DRIVER_SWING (12G) The output pre-emphasis on the Trace Driver can be configured for the following five rates: • CFG_OUTPUT1_TD_SD_PREEMPH_WIDTH (SD) • CFG_OUTPUT1_TD_SD_PREEMPH_AMPL (SD) • CFG_OUTPUT1_TD_HD_PREEMPH_WIDTH (HD) • CFG_OUTPUT1_TD_HD_PREEMPH_AMPL (HD) • CFG_OUTPUT1_TD_3G_PREEMPH_WIDTH (3G) • CFG_OUTPUT1_TD_3G_PREEMPH_AMPL (3G) • CFG_OUTPUT1_TD_6G_PREEMPH_WIDTH (6G) • CFG_OUTPUT1_TD_6G_PREEMPH_AMPL (6G) |
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