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Network Working Group Bill ENGLISH
RFC-34 SRI / ARC
26 February 1970
Some preliminary recordings about the ARC clock
(RFC34 Some Brief Preliminary Notes On The ARC Clock)
The ARC clock system provides reference nature to the main memory of the XDS 940 computer. There are two time information
Effective - absolute time and relative time.
The absolute time is written into the neighboring words in the kernel with the format:
The first word -
The 0th to 7th bit includes code of the month directly represented by binary, the range is from 1 to 12
The 8th to 15th bit includes the date code represented by binary, and the range is from 1 to 31
The 16th to 23rd bits include a year code that is directly represented by binary, and the range is from 0 to 99
Second word -
The 0th to 7th bit includes a code directly used in binary representation, ranging from 0 to 23
The 8th to the 15th includes code that is directly used in minutes, the range is from 0 to 60
The 16th to the 23rd includes code that directly expressed directly in binary, the range is from 0 to 60
These two words are written every second. When submitted to WWV, it is expected that the accuracy of its initial setting can reach 1
Second, and the cumulative error every 250 days should no more than 1 second. The vibrators and clocks are powered by the backup power supply to protect
The accuracy of the certificate system. Due to the uncertain time delay caused by the access to the 940 system, it is expected to be short-term
Accuracy can be kept around 10 to 20 microseconds.
The relative time is only written in one word in the main memory, simply, is a 24-bit binary accumulator. accumulator
The refresh rate is optional, which can be one microsecond, or 1 microseconds. In both cases, accumulator
Every time you refresh, write it once. On the same, the short-term accuracy can be kept around 10 to 20 microseconds, long-term fine
The determination will be equal to 1 second every 250 days.
[This RFC WAS PUT INTO MACHINE READABLE FORM for Entry]
[INTO THE Online RFC Archives by Katsunori Tanaka 1/98]
RFC 34 Some Brief Preliminary Notes on The ARC Clock About ARC Clock Summary
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