DS20006554A datasheet(68/94 Pages) MICROCHIP

68 / 94 page

ZL30260-ZL30263

Data Sheet

DS20006554A

OCxDIFF

Output Clock x Start Stop Register

OC1: 202h, OC2: 212h, OC3: 222h, OC4: 232h, OC5: 242h

OC6: 252h, OC7: 262h, OC8: 272h, OC9: 282h, OC10: 292h

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Name

VCM[3:0]

VOD[3:0]

Default

Bits 7 to 4: Differential Common-Mode Voltage (VCM[3:0]). This field specifies the common-mode voltage for the

differential output driver. See section 5.6.1.

0000 = 1.23V (default)

– typical for LVDS and AC-coupled LVPECL

0011 = 1.0V

0100 = 1.1V

0101 = 1.3V

0110 = 1.4V

0111 = 1.5V

1000 = 1.6V

1001 = 1.7V

1010 = 1.8V

1011 = 1.9V

1100 = 2.0V

– typical for DC-coupled LVPECL

1101 = 2.1V

1111 = Use this setting for HCSL signal format

All other values reserved

Bits 3 to 0: Differential Swing Voltage (VOD[3:0]). This field specifies the differential output voltage (VOD) for the

differential output driver. In the device this field actually controls driver output current. When the specified current is

driven into the required external 100

 termination resistor, the voltage across the termination resistor is the desired

VOD. See Figure 16 for the definition of VOD. VOD is equivalent to the single-ended voltage swing of the OCxP pin or

the OCxN pin. This field is ignored and VOD is set to 400mV when OCxCR2.OCSF=0001 (LVDS). See section 5.6.1.

0000 = 300mV (3mA driver current)

0001 = 400mV

– typical for LVDS

0010 = 500mV

0011 = 600mV

0100 = 700mV

0101 = 800mV

– default value, typical for LVPECL

0110 = 900mV (9mA driver current)

1010 = Use this setting for HCSL signal format

All other values reserved

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