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©2018 Integrated Device Technology, Inc
September 12, 2018
8A3xxxx Family Programming Guide
DPLL_CTRL_0.DPLL_MASTER_DIV
Master divider value.
DPLL_CTRL_0.DPLL_FOD_FREQ Bit Field Descriptions
Bit Field Name
Field Type Default Value
Description
N[15:0]
R/W
0
Unsigned 16-bit frequency N field.
N must not be configured to 0.
M[47:0]
R/W
0
Unsigned 48-bit frequency M field.
A setting of 0 will disable the FOD, but not other parts of the DPLL. This will
significantly reduce the power consumption of this DPLL. As there is no clock
output from the FOD when this field is set to 0, it is suggested to disable the
outputs which are associated with this FOD by setting
SCSR_OUTPUT_0.PAD_MODE to 0 (high-Z mode).
Table 269: DPLL_CTRL_0.DPLL_MASTER_DIV Bit Field Locations and Descriptions
Offset
Address
(Hex)
DPLL_CTRL_0.DPLL_MASTER_DIV Bit Field Locations
D7
D6
D5
D4
D3
D2
D1
D0
024h
DPLL_MASTER_DIV[7:0]
025h
DPLL_MASTER_DIV[15:8]
026h
DPLL_MASTER_DIV[23:16]
027h
DPLL_MASTER_DIV[31:24]
DPLL_CTRL_0.DPLL_MASTER_DIV Bit Field Descriptions
Bit Field Name
Field Type Default Value
Description
DPLL_MASTER_DIV[31:0]
R/W
0
Unsigned 32-bit master divider value.
For each of the 8 output channels, there is a master divider circuit that divides
down the FOD clock. The purpose of this divider is to send sync signals to the
output channel's important dividers, such as the integer output divider(s), the
DPLL feedback divider, the DPLL feedback frame divider and the ToD (for those
channels that have a ToD).
0 means the master divider is set to a value that results in an 8 KHz signal
coming out of the master divider block.