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DS125BR401 Datasheet(PDF) 36 Page - Texas Instruments |
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DS125BR401 Datasheet(HTML) 36 Page - Texas Instruments |
36 / 52 page DS125BR401 SNLS419D – JULY 2012 – REVISED MAY 2015 www.ti.com Register Maps (continued) Table 10. SMBUS Slave Mode Register Map (continued) Addres Register Name Bit Field Type Default EEPROM Description s Bit 0x3A CH6 - CHA2 7:0 EQ Control R/W 0x2F Yes IA2 EQ Control - total of 256 levels. EQ See Table 2. 0x3B CH6 - CHA2 7 Short Circuit R/W 0xAD Yes 1: Enable the short circuit protection VOD Protection 0: Disable the short circuit protection 6 MODE_SEL Yes 1: PCIe Gen-1 or PCIe Gen-2 0: PCIe Gen-3 Note: override the MODE pin. 5:3 Reserved Yes Set bits to default value - 101. 2:0 VOD Control Yes OA2 VOD Control 000: 0.7 V 001: 0.8 V 010: 0.9 V 011: 1 V 100: 1.1 V 101: 1.2 V (default) 110: 1.3 V 111: 1.4 V 0x3C CH6 - CHA2 7 RXDET R 0x02 Observation bit for RXDET CH6 - CHA2. DEM STATUS 1: RX = detected 0: RX = not detected 6:5 MODE_DET R Observation bit for MODE_DET CH6 - CHA2. STATUS 00: PCIe Gen-1 (2.5G) 01: PCIe Gen-2 (5G) 11: PCIe Gen-3 (8G+) Note: Only functions when MODE Pin = Automatic 4:3 Reserved R/W Set bits to 0. 2:0 DEM Control R/W Yes OA2 DEM Control 000: 0 dB 001: –1.5 dB 010: –3.5 dB (default) 011: –5 dB 100: –6 dB 101: –8 dB 110: –9 dB 111: –12 dB 0x3D CH6 - CHA2 7:4 Reserved R/W 0x00 Set bits to 0. IDLE Threshold 3:2 IDLE tha Yes Assert threshold 00 = 180 mVp-p (default) 01 = 160 mVp-p 10 = 210 mVp-p 11 = 190 mVp-p Note: override the SD_TH pin. 1:0 IDLE thd Yes Deassert threshold 00 = 110 mVp-p (default) 01 = 100 mVp-p 10 = 150 mVp-p 11 = 130 mVp-p Note: override the SD_TH pin. 0x3E Reserved 7:0 Reserved R/W 0x00 Set bits to 0 0x3F CH7 - CHA3 7:3 Reserved R/W 0x00 Set bits to 0. Signal Detect 2 SD Reset 1: Force signal detect "off" 0: Normal operation 1 SD Preset 1: Force signal detect "on" 0: Normal operation 0 Reserved Set bit to 0. 36 Submit Documentation Feedback Copyright © 2012–2015, Texas Instruments Incorporated Product Folder Links: DS125BR401 |
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