Datasheet

AD9920A
Rev. B | Page 108 of 112
Table 63. V-Sequence (VSEQ) Registers (Default Values Are Undefined)
Address
Data
Bits
Default
Value
Update
Type
Name Description
0x00 [0] X SCP CLPOBPOL CLPOB start polarity.
[1] X PBLKPOL PBLK start polarity.
[5:2] X HOLD 1 = enable HOLD function for each VPAT group (A, B, C, D).
[6] X VSEQALT_EN Special V-sequence alternation enable.
[9:7] X SPC_PAT_EN 1 = enable use of special vertical pattern insertion into VPATA sequence.
Bit 0: Use VPATB as the special pattern.
Bit 1: Use VPATC as the special pattern.
Bit 2: Use VPATD as the special pattern.
[13:10] X CONCAT_GRP
Combine multiple VPAT groups together in one sequence. Set register
equal to 0x01 to enable.
[15:14] X VREP_MODE Defines V-alternation repetition mode.
00 = single-pattern alternation for all groups.
01 = two-pattern alternation for all groups.
10 = three-pattern alternation for Group A; Groups B/C/D follow pattern
{0, 1, 1, 0, 1, 1…}.
11 = four-pattern alternation for Group A; two-pattern for Groups B/C/D.
[19:16] X LASTREPLEN_EN
Enable a separate pattern length to be used during the last repetition of
the V-sequence. One bit for each group (A, B, C, and D); Group A is the LSB.
Set bit high to enable. Recommended value is enabled.
[21:20] X HBLK_MODE Selection of HBLK modes.
00 = HBLK Mode 0 (normal six-toggle operation).
01 = HBLK Mode 1.
10 = test use only; do not access.
11 = test use only; do not access.
[23:22] X Test Test use only. Set to 0.
[24] X SUBCK_MASK 1 = enable SUBCK masking feature.
0x01 [13:0] X SCP HDLENE HD line length for even lines.
0x02 [13:0] X SCP HDLENO HD line length for odd lines.
0x03 [23:0] X SCP VSGPATSEL
Select which two toggle positions are used by each V-output
when they are configured as VSG pulses (in Miscellaneous Register 0x1C).
0 = use Toggle 1, Toggle 2.
1 = use Toggle 3, Toggle 4.
0x04 [12:0] X SCP LASTREPLEN_A
Last repetition length for Group A. Must be enabled using LASTREPLEN_EN
register. Set equal to VLENA register.
[25:13] X LASTREPLEN_B
Last repetition length for Group B. Must be enabled using LASTREPLEN_EN
register. Set equal to VLENB register.
0x05 [12:0] X SCP LASTREPLEN_C
Last repetition length for Group C. Must be enabled using LASTREPLEN_EN
register. Set equal to VLENC register.
[25:13] X LASTREPLEN_D
Last repetition length for Group D. Must be enabled using LASTREPLEN_EN
register. Set equal to VLEND register.
0x06 [23:0] X SCP VPOL Starting polarities for each V-output signal.
0x07 [23:0] X SCP GROUPSEL_0 Select to which group each V1 to V12 signal is assigned.
00 = Group A.
01 = Group B.
10 = Group C.
11 = Group D.
Bits[1:0]: V1.
Bits[3:2]: V2.
Bits[23:22]: V12.