Datasheet

AD9920A
Rev. B | Page 35 of 112
Table 15. Summary of V-Sequence Registers (see Table 11 and Table 12 for the CLPOB, PBLK, and HBLK Register Summary)
Register
Length
(Bits) Description
HOLD 4
Use in conjunction with VMASK_EVEN and VMASK_ODD.
1 = Enable HOLD function instead of FREEZE/RESUME function.
CONCAT_GRP 4
Combines toggle positions of Group A, Group B, Group C, and Group D when enabled. Only Group A settings
for start, polarity, length, and repetition are used when this mode is selected.
0 = disable.
1 = enable the addition of all toggle positions from VPATSELA/B/C/D.
2 to 15 = test mode only; do not use.
VREP_MODE 2
Selects line alternation for V-output repetitions. Two separate controls: one for Group A and the other for
Group B, Group C, and Group D.
0 = disable alternation. Group A uses VREPA_1, Groups B/C/D use VREP_EVEN for all lines.
1 = two-line. Group A alternates VREPA_1 and VREPA_2. Groups B/C/D alternate VREP_EVEN and VREP_ODD.
2 = three-line. Group A alternates VREPA_1, VREPA_2, and VREPA_3. Groups B/C/D follow a VREP_EVEN,
VREP_ODD, VREP_ODD, VREP_EVEN, VREP_ODD, VREP_ODD pattern.
3 = four-line. Group A alternates VREPA_1, VREPA_2, VREPA_3, and VREPA_4. Groups B/C/D follow two-line
alternation.
LASTREPLEN_EN 4
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.
HDLENE 14 HD line length for even lines in the V-sequence.
HDLENO 14 HD line length for odd lines in the V-sequence.
VPOL 24 Group A start polarity bits for each XV1 to XV24 signal.
GROUPSEL_0 24
Assigns each XV1 to XV12 signal to Group A, Group B, Group C, or Group D. Two bits for each signal.
Bits[1:0] are for XV1.
Bits[3:2] are for XV2.
Bits[23:22] are for XV12.
0 = assign to Group A.
1 = assign to Group B.
2 = assign to Group C.
3 = assign to Group D.
GROUPSEL_1 24
Assigns each XV13 to XV24 signal to Group A, Group B, Group C, or Group D. Two bits for each signal.
Bits[1:0] are for XV13.
Bits[3:2] are for XV14.
Bits[23:22] are for XV24.
0 = assign to Group A.
1 = assign to Group B.
2 = assign to Group C.
3 = assign to Group D.
VPATSELA 5 Selected V-pattern for Group A.
VPATSELB 5 Selected V-pattern for Group B.
VPATSELC 5 Selected V-pattern for Group C.
VPATSELD 5 Selected V-pattern for Group D.
VSTARTA 13 Start position for the selected V-pattern Group A.
VSTARTB 13 Start position for the selected V-pattern Group B.
VSTARTC 13 Start position for the selected V-pattern Group C.
VSTARTD 13 Start position for the selected V-pattern Group D.
VLENA 13 Length of selected V-pattern Group A.
VLENB 13 Length of selected V-pattern Group B.
VLENC 13 Length of selected V-pattern Group C.
VLEND 13 Length of selected V-pattern Group D.
VREPA_1 13 Number of repetitions for the V-pattern Group A for first lines (even).
VREPA_2 13 Number of repetitions for the V-pattern Group A for second lines (odd).
VREPA_3 13 Number of repetitions for the V-pattern Group A for third lines.
VREPA_4 13 Number of repetitions for the V-pattern Group A for fourth lines.