
AD9920A
Rev. B | Page 99 of 112
Address
Data Bits
Default Value
Update Type
Name
Description
0x2C
[4:0]
0
SCK
FIELD6
Selected sixth field in the mode register.
[9:5]
0
FIELD7
Selected seventh field in the mode register.
0x2D
[27]
0
SCK
UNUSED
Do not access, or set to 0.
0x2E
[27]
0
SCK
UNUSED
Do not access, or set to 0.
0x2F
[27]
0
SCK
UNUSED
Do not access, or set to 0.
Table 57. Timing Core Registers
Address
Data Bits
Default
Value
Update
Type
Name
Description
0x30
[5:0]
0
SCK
H1POSLOC
H1 rising edge location in HCLK Mode 1, Mode 2, and Mode 3.
Phase 3 (H7/H8) rising edge location in 3-phase mode.
[13:8]
0x20
H1NEGLOC
H1 falling edge location in HCLK Mode 1, Mode 2, and Mode 3.
Phase 3 (H7/H8) falling edge location in 3-phase mode.
[16]
0x01
Test
Test use only. Set to 1.
0x31
[5:0]
0
SCK
H2POSLOC
H2 rising edge location in HCLK Mode 2.
H5 rising edge location in HCLK Mode 3.
Phase 2 (H5/H6) rising edge location in 3-phase mode.
[13:8]
0x20
H2NEGLOC
H2 falling edge location in HCLK Mode 2.
H5 falling edge location in HCLK Mode 3.
Phase 2 (H5/H6) falling edge location in 3-phase mode.
[16]
0x01
Test
Test use only. Set to 1.
0x32
[5:0]
0
SCK
HLPOSLOC
HL rising edge location.
[13:8]
0x20
HLNEGLOC
HL falling edge location.
[16]
0x01
Test
Test use only. Set to 1.
0x33
[5:0]
0
SCK
H3P1POSLOC
Phase 1 (H1/H2) rising edge location in 3-phase mode.
[13:8]
0x20
H3P1NEGLOC
Phase 1 (H1/H2) falling edge location in 3-phase mode.
[16]
0x01
Test
Test use only. Set to 1.
0x34
[5:0]
0
SCK
RGPOSLOC
RG rising edge location.
[13:8]
0x10
RGNEGLOC
RG falling edge location.
[16]
0x01
Test
Test use only. Set to 1.
0x35
[0]
0
SCK
H1HBLKRETIME
Retime H1 HBLK to internal clock. Enabling retime adds one half cycle
delay to HBLK position.
0 = no retime.
1 = retime.
[1]
0
H2HBLKRETIME
Retime H2 HBLK to internal clock.
[2]
0
HLHBLKRETIME
Retime HL HBLK to internal clock.
[3]
0
H3PHBLKRETIME
Retime H3 HBLK to internal clock.
[7:4]
0
HCLK_WIDTH
Enables wide H-clocks during HBLK interval. Set to 0 to disable.
[8]
0
Test
Test use only. Set to 0.
[9]
0
HLHBLK
1 = enable HBLK for HL.
[19:10]
0
Test
Test use only. Set to 0.
[20]
0
H1FINERETIME
Adds one additional retime operation to H1 HBLK signal.
[21]
0
H2FINERETIME
Adds one additional retime operation to H2 HBLK signal.
[22]
0
HLFINERETIME
Adds one additional retime operation to HL HBLK signal.
[23]
0
H3PFINERETIME
Adds one additional retime operation to H3P HBLK signal
(3-phase mode).