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AD9920A
Rev. B | Page 36 of 112
Register
Length
(Bits)
Description
VREPB_ODD
13
Number of repetitions for the V-pattern Group B for odd lines.
VREPC_ODD
13
Number of repetitions for the V-pattern Group C for odd lines.
VREPD_ODD
13
Number of repetitions for the V-pattern Group D for odd lines.
VREPB_EVEN
13
Number of repetitions for the V-pattern Group B for even lines.
VREPC_EVEN
13
Number of repetitions for the V-pattern Group C for even lines.
VREPD_EVEN
13
Number of repetitions for the V-pattern Group D for even lines.
FREEZE1
13
Pixel location where the V-outputs freeze or hold (see VMASK_EVEN and VMASK_ODD). Also used as
VALTSEL0_EVEN, Bits[12:0] register when special VSEQALT_EN mode is enabled.
FREEZE2
13
Pixel location where the V-outputs freeze or hold (see VMASK_EVEN and VMASK_ODD). Also used as
VALTSEL1_EVEN, Bits[12:0] register when special VSEQALT_EN mode is enabled.
FREEZE3
13
Pixel location where the V-outputs freeze or hold (see VMASK_EVEN and VMASK_ODD). Also used as
VALTSEL0_ODD, Bits[12:0] register when special VSEQALT_EN mode is enabled.
FREEZE4
13
Pixel location where the V-outputs freeze or hold (see VMASK_EVEN and VMASK_ODD). Also used as
VALTSEL1_ODD, Bits[12:0] register when special VSEQALT_EN mode is enabled.
RESUME1
13
Pixel location where the V-outputs resume operation (see VMASK_EVEN and VMASK_ODD). Also used as
VALTSEL0_EVEN, Bits[17:13] register when special VSEQALT_EN mode is enabled.
RESUME2
13
Pixel location where the V-outputs resume operation (see VMASK_EVEN and VMASK_ODD). Also used as
VALTSEL1_EVEN, Bits[17:13] register when special VSEQALT_EN mode is enabled.
RESUME3
13
Pixel location where the V-outputs resume operation (see VMASK_EVEN and VMASK_ODD). Also used as
VALTSEL0_ODD, Bits[17:13] register when special VSEQALT_EN mode is enabled.
RESUME4
13
Pixel location where the V-outputs resume operation (see VMASK_EVEN and VMASK_ODD). Also used as
VALTSEL1_ODD, Bits[17:13] register when special VSEQALT_EN mode is enabled.
LASTREPLEN_A
13
Separate length for last repetition of vertical pulses for Group A. Must be enabled using LASTREPLEN_EN.
Should be programmed to a value equal to the VLENA register.
LASTREPLEN_B
13
Separate length for last repetition of vertical pulses for Group B. Must be enabled using LASTREPLEN_EN.
Should be programmed to a value equal to the VLENB register.
LASTREPLEN_C
13
Separate length for last repetition of vertical pulses for Group C. Must be enabled using LASTREPLEN_EN.
Should be programmed to a value equal to the VLENC register.
LASTREPLEN_D
13
Separate length for last repetition of vertical pulses for Group D. Must be enabled using LASTREPLEN_EN.
Should be programmed to a value equal to the VLEND register.
VSEQALT_EN
1
Special V-sequence alternation mode is enabled when this register is programmed high.
VALTSEL0_EVEN
18
Select lines for special V-sequence alternation mode for even lines. Used to concatenate VPAT Group A, Group B,
Group C, and Group D into unique merged patterns. Setting is used to specify one segment, with up to a maxi-
mum of 18 segments. (The FREEZE/RESUME registers function as VALTSEL when VSEQALT_EN is enabled.)
VALTSEL1_EVEN
18
Select lines for special V-sequence alternation mode for even lines. Used to concatenate VPAT Group A, Group B,
Group C, and Group D into unique merged patterns. Setting is used to specify one segment, with up to a maxi-
mum of 18 segments. (The FREEZE/RESUME registers function as VALTSEL when VSEQALT_EN is enabled.)
VALTSEL0_ODD
18
Select lines for special V-sequence alternation mode for odd lines. Used to concatenate VPAT Group A, Group B,
Group C, and Group D into unique merged patterns. Setting is used to specify one segment, with up to a maxi-
mum of 18 segments. (The FREEZE/RESUME registers function as VALTSEL when VSEQALT_EN is enabled.)
VALTSEL1_ODD
18
Select lines for special V-sequence alternation mode for odd lines. Used to concatenate VPAT Group A, Group B,
Group C, and Group D into unique merged patterns. Setting is used to specify one segment, with up to a maxi-
mum of 18 segments. (The FREEZE/RESUME registers function as VALTSEL when VSEQALT_EN is enabled.)
SPC_PAT_EN
3
Enable special V-pattern to be inserted into one repetition of a VPATA series.
SPC_PAT_EN, Bit 0: set to 1 to enable VPATB to be used as special pattern insertion.
SPC_PAT_EN, Bit 1: set to 1 to enable VPATC to be used as special pattern insertion.
SPC_PAT_EN, Bit 2: set to 1 to enable VPATD to be used as special pattern insertion.
SEQ_ALT_INC
1
0 = normal operation.
1 = automatically increments the sequence number at the end of the line, unless a sequence change
position boundary is reached.
SEQ_ALT_RST
1
0 = normal operation.
1 = automatically resets the sequence number back to the sequence defined for that particular region in the
active field register.