Datasheet

AD9122
Rev. B | Page 26 of 60
Register
Name
Address
(Hex) Bits Name Description Default
Sync Status 0x12 7 Sync lost 1 = synchronization was attained but has been lost. N/A
6 Sync locked 1 = synchronization has been attained. N/A
0x13 [7:0] Sync Phase Readback[7:0]
Indicates the averaged sync phase offset (6.2 format). If
this value differs from the Sync Phase Request[5:0] value
in Register 0x11, a sync timing error has occurred. For more
information, see the Sync Status Bits section.
N/A
00000000 = 0.0.
00000001 = 0.25.
…
11111110 = 63.50.
11111111 = 63.75.
Data
Receiver
Status
0x15 5 LVDS FRAME level high One or both LVDS FRAME input signals have exceeded 1.7 V. N/A
4 LVDS FRAME level low
One or both LVDS FRAME input signals have crossed below
0.7 V.
N/A
3 LVDS DCI level high One or both LVDS DCI input signals have exceeded 1.7 V. N/A
2 LVDS DCI level low
One or both LVDS DCI input signals have crossed
below 0.7 V.
N/A
1 LVDS data level high One or more LVDS Dx input signals have exceeded 1.7 V. N/A
0 LVDS data level low One or more LVDS Dx input signals have crossed below 0.7 V. N/A
DCI Delay 0x16 [1:0] DCI Delay[1:0]
This option is available for the Revision 2 silicon only. The
DCI delay bits control the delay applied to the DCI signal.
The DCI delay affects the sampling interval of the DCI with
respect to the Dx inputs. See Table 13.
00 = 350 ps delay of DCI signal.
01 = 590 ps delay of DCI signal.
10 = 800 ps delay of DCI signal.
11 = 925 ps delay of DCI signal.
00
FIFO
Control
0x17 [2:0] FIFO Phase Offset[2:0]
FIFO write pointer phase offset following FIFO reset. This
is the difference between the read pointer and the write
pointer values upon FIFO reset. The optimal value is
nominally 4 (100).
100
000 = 0.
001 = 1.
…
111 = 7.
FIFO Status 0x18 7 FIFO Warning 1 1 = FIFO read and write pointers are within ±1. N/A
6 FIFO Warning 2 1 = FIFO read and write pointers are within ±2. N/A
2
FIFO soft align
acknowledge
1 = FIFO read and write pointers are aligned after a serial
port initiated FIFO reset.
N/A
1 FIFO soft align request
1 = request FIFO read and write pointer alignment via the
serial port.
0
0x19 [7:0] FIFO Level[7:0] Thermometer encoded measure of the FIFO level. N/A