
ToD Clock Configuration Register Space
Table C-6: ToD Clock Registers
HW
Reset
DescriptionR/WNameDword
Offset
0x0• Bits 0 to 15: High-order 16-bit second field.
• Bits 16 to 31: Not used.
RWSecondsH0x00
0x0Bits 0 to 32: Low-order 32-bit second field.RWSecondsL0x01
0x0Bits 0 to 32: 32-bit nanosecond field.RWNanoSec0x02
—Reserved for future use—Reserved0x03
nThe period for the frequency adjustment.
• Bits 0 to 15: Period in fractional nanosecond
(PERIOD_FNS).
• Bits 16 to 24: Period in nanosecond (PERIOD_
NS).
• Bits 25 to 31: Not used.
The default value for the period depends on the
f
MAX
of the MAC function. For example, if f
MAX
=
125-MHz, the period is 8-ns (PERIOD_NS = 0x0008
and PERIOD_FNS = 0x0000).
RWPeriod0x04
0x0The period for the offset adjustment.
• Bits 0 to 15: Period in fractional nanosecond
(ADJPERIOD_FNS).
• Bits 16 to 24: Period in nanosecond
(ADJPERIOD_NS).
• Bits 25 to 31: Not used.
RWAdjustPeriod0x05
0x06Bits 0 to 19: The number of AdjustPeriod clock
cycles used during offset adjustment.
Bits 20 to 31: Not used.
RWAdjustCount0x06
Altera Corporation
Time-of-Day (ToD) Clock
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C-5
ToD Clock Configuration Register Space
UG-01008
2014.06.30
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