Meinberg VME31 - Manual (Page 9)

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method is to read the clock interrupt driven or poll the 100th-of-seconds until the
value changes: in both of the cases, the software has an interval of 10ms to read the
desired data.
Address Map
The VME31 radio remote clock has a A16:D8 bus interface, so the dual port RAM
must be accessed byte wide on odd address offsets related to the base address. The
address map is shown below:
01h (reserved)
03h (reserved)
05h interrupt vector (default: 0Fh)
07h interrupt level (00h..07h, default: 00h - disabled)
09h interrupt rate (default: 00h, see below)
0Bh EPROM ID
0Dh status (see below)
0Fh year (00h..99h)
11h month (01h..12h)
13h day-of-month (01h..31h)
15h hour (00h..23h)
17h minute (00h..59h)
19h second (00h..59h)
1Bh sec100 (00h..99h)
1Dh day-of-week (01h..07h, 01h = Monday)
1Fh (reserved)
Date and time values are represented in packed BCD numbers.
The bits of the status byte are defined as described below:
bit stands for “1” “0”
D0 clock´s current state: free running DCF77 controlled
D1 daylight saving: enabled disabled
D2 Sync´ed since last Reset: yes no
D3 dayl. saving going to change: yes no
D4 interrupt enabled disabled
D5 (reserved, always "0")
D6 (reserved, always "0")
D7 on-board RTC time invalid: yes no