Spectracom TPRO-cPCI, User Manual, Page: 29 / 46

Spectracom Corporation TPRO-cPCI/TSAT-cPCI
Synchronizable Timecode Generator User Manual 4-7
4.3.10 Clock Time Registers
(tbreg_clk_upper, tbreg_clk_lower, and tbreg_clk_date)
To read the Clock Time, first read the Status Register as described above, then read the two
Clock Time registers and the Clock Date register. These registers consist of groups of four bits,
each of which represents a digit in the time (i.e., it is in Binary Coded Decimal [BCD] format).
Bits tbreg_clk_upper tbreg_clk_lower
31:28 (reserved) 10s of seconds
27:24 100s of days 1s of seconds
23:20 10s of days 100s of mS
19:16 1s of days 10s of mS
15:12 10s of hours 1s of mS
11:08 1s of hours 100s of µS
07:04 10s of minutes 10s of µS
03:00 1s of minutes 1s of µS
For example, the time day 123, hour 09, minute 41, second 36.456789 would be represented
as:
tbreg_clk_upper =
0x?1230941
Η
tbreg_clk_lower = 0x36456789
Η
Denotes an undefined value