HMC7044 Datasheet, PDF (63/72 Pages) Analog Devices – JESD204B clock generation

Data Sheet
HMC7044
Table 67. PLL1 Alarm Readback
Address Bits Bit Name
0x007C 7 PLL1 near lock
6 PLL1 lock acquisition
5 PLL1 lock detect
4 PLL1 holdover status
[3:0] CLKINx/CLKINx
LOS[3:0]
Settings
Bit 0
Bit 1
Bit 2
Bit 3
Description
PLL1 near locked. Declare near locked when the counter reaches 1/16 of
the programmable limit.
PLL1 acquiring lock.
PLL1 locked.
PLL1 in holdover.
CLKIN0/CLKIN0 LOS.
CLKIN1/CLKIN1 LOS.
CLKIN2/CLKIN2 LOS.
CLKIN3/CLKIN3 LOS.
Access
R
Table 68. Alarm Readback
Address Bits Bit Name
0x007D [7:5] Reserved
4 Sync request status
3 PLL1 and PLL2 lock
detect
2 Clock outputs phases
status
1 SYSREF sync status
0 PLL2 lock detect
Settings
0
1
0
1
0
1
1
Description
Reserved.
PLL2 locked (or disabled), but unsynchronized.
PLL1 and PLL2 lock detect status.
Either PLL1 or PLL2 is not locked or both PLL1 and PLL2 are not locked.
PLL1 and PLL2 are locked.
SYSREF alarm.
SYSREF of the HMC7044 is not valid; that is, its phase output is not stable.
SYSREF of the HMC7044 is valid and locked; that is, its phase output is
stable.
SYSREF SYNC status alarm.
The HMC7044 has been synchronized with an external sync pulse or a
sync request from the SPI.
The HMC7044 never synchronized with an external sync pulse or a sync
request from the SPI.
PLL2 near locked. Declare near locked when counter reaches 1/16 of the
programmable limit.
Access
R
Table 69. Latched Alarm Readback
Address Bits Bit Name
0x007E 7 Reserved
6 PLL2 lock acquisition latched
5 PLL1 lock acquisition latched
4 PLL1 holdover latched
[3:0] CLKINx/CLKINx LOS
Latched[3:0]
Settings
Bit 0
Bit 1
Bit 2
Bit 3
Description
Reserved.
Readback record of PLL2 lock acquisition since the last clear event.
Readback record of PLL1 lock acquisition since the last clear event.
Readback record of PLL1 holdover since the last clear event.
Readback record of CLKIN0/CLKIN0 LOS since the last clear event.
Readback record of CLKIN1/CLKIN1 LOS since the last clear event.
Readback record of CLKIN2/CLKIN2 LOS since the last clear event.
Readback record of CLKIN3/CLKIN3 LOS since the last clear event.
Access
R
Table 70. Alarm Readback Miscellaneous
Address Bits Bit Name
0x007F [7:0] Reserved
Settings Description
Reserved.
Access
R
Rev. B | Page 63 of 72