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AD9974BBCZ датащи(PDF) 45 Page - Analog Devices |
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AD9974BBCZ датащи(HTML) 45 Page - Analog Devices |
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45 / 52 page ![]() AD9974 Rev. A | Page 45 of 52 Table 27. Timing Core Registers Address Data Bit Content Default Value Update Name Description 0x30 [5:0] 0 SCK H1POSLOC H1 Rising Edge Location. [7:6] Unused Set unused bits to 0. [13:8] 20 H1NEGLOC H1 Falling Edge Location. [15:14] 0 TESTMODE Test Operation Only. Set to 0. [16] 1 H1POL H1 Polarity Control. 0 = inverse of Figure 21. 1 = no inversion. [27:17] Unused Set unused bits to 0. 0x31 [5:0] 0 SCK H2POSLOC H2 Rising Edge Location. [7:6] Unused Set unused bits to 0. [13:8] 20 H2NEGLOC H2 Falling Edge Location. [15:14] 0 TESTMODE Test Operation Only. Set to 0. [16] 1 H2POL H2 Polarity Control. 0 = inverse of Figure 21. 1 = no inversion. [27:17] Unused Set unused bits to 0. 0x32 [5:0] 0 SCK TESTMODE Test Operation Only. Set to 0. [7:6] Unused Set unused bits to 0. [13:8] 20 TESTMODE Test Operation Only. Set to 20. [15:14] 0 TESTMODE Test Operation Only. Set to 0. [16] 1 TESTMODE Test Operation Only. Set to 1. [27:17] Unused Set unused bits to 0. 0x33 [5:0] 0 SCK RGPOSLOC RG Rising Edge Location. [7:6] Unused Set unused bits to 0. [13:8] 10 RGNEGLOC RG Falling Edge Location. [15:14] 0 TESTMODE Test Operation Only. Set to 0. [16] 1 RGPOL RG Polarity Control. 0 = inverse of Figure 21. 1 = no inversion. [27:17] Unused Set unused bits to 0. 0x34 [0] 0 SCK H1BLKRETIME Retime H1 HBLK to Internal Clock. 0 = no retime. 1 = enable retime. Recommended setting is enable retime. Enabling retime adds one cycle delay to programmed HBLK positions. [1] 0 H2BLKRETIME Retime H2 HBLK to Internal Clock. [2] 0 TESTMODE Test Operation Only. Set to 0 [3] 0 TESTMODE Test Operation Only. Set to 0 [7:4] 0 HCLK_WIDTH Enables wide H-clocks during HBLK interval. 0 = disable (see Table 13). [27:8] Unused Set unused bits to 0. 0x35 [2:0] 1 SCK H1DRV H1 Drive Strength. 0 = off. 1 = 4.3 mA. 2 = 8.6 mA. 3 = 12.9 mA. 4 = 17.2 mA. 5 = 21.5 mA. 6 = 25.8 mA. 7 = 30.1 mA. [3] Unused Set unused bits to 0. [6:4] 1 H2DRV H2 Drive Strength. [7] Unused Set unused bits to 0. |
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