AD9920ABBCZ datasheet(108/112 Pages) AD

108 / 112 page

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]

SCP

CLPOBPOL

CLPOB start polarity.

[1]

PBLKPOL

PBLK start polarity.

[5:2]

HOLD

1 = enable HOLD function for each VPAT group (A, B, C, D).

[6]

VSEQALT_EN

Special V-sequence alternation enable.

[9:7]

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]

CONCAT_GRP

Combine multiple VPAT groups together in one sequence. Set register

equal to 0x01 to enable.

[15:14]

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]

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]

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]

Test

Test use only. Set to 0.

[24]

SUBCK_MASK

1 = enable SUBCK masking feature.

0x01

[13:0]

SCP

HDLENE

HD line length for even lines.

0x02

[13:0]

SCP

HDLENO

HD line length for odd lines.

0x03

[23:0]

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]

SCP

LASTREPLEN_A

Last repetition length for Group A. Must be enabled using LASTREPLEN_EN

[25:13]

LASTREPLEN_B

Last repetition length for Group B. Must be enabled using LASTREPLEN_EN

0x05

[12:0]

SCP

LASTREPLEN_C

Last repetition length for Group C. Must be enabled using LASTREPLEN_EN

[25:13]

LASTREPLEN_D

Last repetition length for Group D. Must be enabled using LASTREPLEN_EN

0x06

[23:0]

SCP

VPOL

Starting polarities for each V-output signal.

0x07

[23:0]

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.

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