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DS1877 Datasheet(PDF) 19 Page - Maxim Integrated Products |
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DS1877 Datasheet(HTML) 19 Page - Maxim Integrated Products |
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19 / 65 page  19 Maxim Integrated SFP Controller for Dual Rx Interface DS1877 Digital I/O Pins Four digital input pins and four digital output pins are provided for monitoring and control. LOS1, LOS2, and LOSOUT When LOSC_ = 0 (Table 02h, Register 8Ah), the LOS_ pin is used to convert a standard comparator output for LOS to an open-collector output. The output of the mux can be read in the STATUS register (Lower Memory, Register 6Eh) as the RXL bit. The RXL signal can be inverted (INVLOS_ = 1) before driving the open-drain output transistor using the XOR gate provided. Setting LOSC_ = 1 configures the mux to be controlled by the LOS LO QT alarm. The mux setting (stored in EEPROM) does not take effect until VCC > POA, allowing the EEPROM to recall. INX, RSEL, OUTX, RSELOUT Digital input pins INX and RSEL primarily serve to meet the rate-select requirements of SFP and SFP+. They can also serve as general-purpose inputs. OUTX and RSELOUT are driven by a combination of the INX, RSEL, and logic dictated by control registers in the EEPROM (see Figure 11). The levels of INX and RSEL can be read from the STATUS register (Lower Memory, Register 6Eh). The open-drain output OUTX can be controlled and/or inverted using the CNFGB register (Table 02h, Register 89h). The open-drain RSELOUT output is software con- trolled and/or inverted through the STATUS register and Figure 10. DAC Offset LUTs Figure 11. Logic Diagram DAC OFFSET LUTs (04h)[A2h/B2h] EIGHT REGISTERS PER DAC 0 255 511 767 1023 EACH OFFSET REGISTER CAN BE INDEPENDENTLY SET BETWEEN 0 AND 1020. 1020 = 4 x FFh. THIS EXAMPLE ILLUSTRATES POSITIVE AND NEGATVE TEMPCO. DAC LUT BITS 7:0 F8h DAC LUT BITS 7:0 F9h DAC LUT BITS 7:0 FAh DAC LUT BITS 7:0 FBh DAC LUT BITS 7:0 FCh DAC LUT BITS 7:0 FDh DAC LUT BITS 7:0 FEh DAC LUT BITS 7:0 FFh 0 255 511 -40°C -8°C +8°C +24°C +40°C +56°C +70°C +88°C +104°C 767 1023 EACH OFFSET REGISTER CAN BE INDEPENDENTLY SET BETWEEN 0 AND 1020. 1020 = 4 x FFh. THIS EXAMPLE ILLUSTRATES POSITIVE TEMPCO. DAC LUT BITS 7:0 F8h DAC LUT BITS 7:0 F9h DAC LUT BITS 7:0 FAh DAC LUT BITS 7:0 FBh DAC LUT BITS 7:0 FCh DAC LUT BITS 7:0 FDh DAC LUT BITS 7:0 FEh DAC LUT BITS 7:0 FFh DAC OFFSET LUTs (04h)[A2h/B2h] EIGHT REGISTERS PER DAC -40°C -8°C +8°C +24°C +40°C +56°C +70°C +88°C +104°C INVOUTX INXC INX INXS RXL OUTX INVRSOUT INVLOSOUT LOSC1 LOS1 LOS LO1 INVLOS1 MUX RSELOUT RSELC RSEL RSELS = PINS LOSOUT LOS2 INVLOS2 LOSC2 LOS LO2 MUX |
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