Rainbow-electronics MAX3798 Bedienungsanleitung PDF herunterladen (Seite 22)

MAX3798

Receiver Control Register 1 (RXCTRL1)

Bit 3: CAZX. When CAZX is set to 0, no external capacitor is required (CAZ1 and CAZ2). When CAZX is set to 1, an

external capacitor with a minimum value of 2nF is required between CAZ1 and CAZ2.

0 = no capacitor

1 = capacitor connected

Bit 2: GMEN. Allows faster switching between data paths.

0 = disabled

1 = enabled

Bit 1: MODE_SEL. MODE_SEL combined with the MSEL pin through a logic-OR function selects between the high-

gain mode (1.0625Gbps to 8.5Gbps) or high-bandwidth mode (1.0625Gbps to 10.32Gbps).

Logic-OR output 0 = high-gain mode

Logic-OR output 1 = high-bandwidth mode

Bit 0: SLEW_RATE. Controls the slew rate of the output stage to reduce the effects of EMI at slower data rates.

Effective when MODE_SEL = 0 and MSEL = GND only.

0 = 50ps

1 = 30ps

Receiver Control Register 2 (RXCTRL2)

Bit 6: LOS_EN. Controls the LOS circuitry. When RX_EN is set to 0 the LOS detector is also disabled.

0 = disabled

1 = enabled

Bit 5: LOS_POL. Controls the output polarity of the LOS pin.

0 = inverse

1 = normal

Bit 4: RX_POL. Controls the polarity of the receiver signal path.

0 = inverse

1 = normal

Bit 3: SQ_EN: When SQ_EN = 1, the LOS controls the output circuitry.

0 = disabled

1 = enabled

1.0625Gbps to 10.32Gbps, Integrated, Low-

Power SFP+ Limiting Amplifier and VCSEL Driver

22 ______________________________________________________________________________________

Bit # 7 6 5 4 3 2 1 0 ADDRESS

Name X X X X CAZX GMEN MODE_SEL SLEW_RATE

Default Value X X X X 1 1 0 0

H0x00

Bit # 7 6 5 4 3 2 1 0 ADDRESS

Name X LOS_EN LOS_POL RX_POL SQ_EN RX_EN RXDE_EN AZ_EN

Default Value X 1 1 1 0 1 0 1

H0x01

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Rainbow-electronics MAX3798 Bedienungsanleitung Seite 22