Datasheet

AD9920A
Rev. B | Page 98 of 112
Table 54. VD/HD Registers
Address Data Bits Default Value
Default
Update Type Name Description
0x20 [0] 0 SCK MASTER VD/HD master or slave mode. 0 = slave mode, 1 = master mode.
0x21 [0] 0 VD VDHDPOL VD/HD active polarity. 0 = low, 1 = high.
0x22 [12:0] 0 VD HDRISE Rising edge location for HD. Minimum value is 36 pixels.
[25:13] 0 VDRISE Rising edge location for VD.
Table 55. I/O Registers
Address
Data
Bits
Default
Value
Default
Update
Type Name Description
0x23 [0] 0 SCK OSC_NVR
Oscillator normal voltage range. Set to match CLIVDD supply voltage.
0 = 1.8 V.
1 = 3.3 V.
[1] 0 XV_NVR
XV output normal voltage range. Set to match VDVDD supply voltage.
0 = 1.8 V.
1 = 3.3 V.
[2] 0 IO_NVR
I/O normal voltage range. Set to match IOVDD supply voltage.
0 = 1.8 V.
1 = 3.3 V.
[3] 0 DATA_NVR
Data pin normal voltage range. Set to match DRVDD supply voltage.
0 = 1.8 V I/O.
1 = 3.3 V I/O.
[4] 0 Test Test use only. Set to 0.
[5] 0 Test Test use only. Set to 0.
[6] 0 Test Test use only. Set to 0.
0x24 [4:0] 0x01 SCK HCLKMODE
Selects HCLK output configuration. Should be written to desired value.
Note that all other settings are invalid.
0x01 = Mode 1.
0x02 = Mode 2.
0x04 = Mode 3.
0x10 = 3-phase HCLK mode.
[5] 0 Test Test use only. Set to 0.
0x25 [24:0] 0 SCK VT_STBY12
Bits[23:0]: Standby1 and Standby2 polarity for XV[23:0].
Bit 24: Standby1 and Standby2 polarity for XSUBCK.
Settings also apply when OUT_CONTROL = low.
0x26 [24:0] 0 SCK VT_STBY3
Bits[23:0]: Standby3 polarity for XV[23:0].
Bit 24: Standby3 polarity for XSUBCK.
0x27 [7:0] 0 SCK GP_STDBY12
Standby1 and Standby2 polarity for GPO outputs.
Settings also apply when OUT_CONTROL = low.
[15:8] 0 GP_STDBY3 Standby3 polarity for GPO outputs.
Table 56. Memory Configuration and Mode Registers
Address Data Bits Default Value Update Type Name Description
0x28 [4:0] 0 SCK VPATNUM Total number of V-pattern groups.
[9:5] 0 SEQNUM Total number of V-sequences.
0x29 [27] 0 SCK UNUSED Do not access, or set to 0.
0x2A [2:0] 0 SCK Mode Total number of fields in the mode register.
0x2B [4:0] 0 SCK FIELD1 Selected first field in the mode register.
[9:5] 0 FIELD2 Selected second field in the mode register.
[14:10] 0 FIELD3 Selected third field in the mode register.
[19:15] 0 FIELD4 Selected fourth field in the mode register.
[24:20] 0 FIELD5 Selected fifth field in the mode register.