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A set of switches is used as a mask and address boundary definer for determining whether an address bit sequence on a bus is intended for a given control unit.
English (United States)
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Address Comparison for Control Unit With Variable Device Range
A set of switches is used as a mask and address boundary definer for
determining whether an address bit sequence on a bus is intended for a given
Within the IBM System/37O architecture, as described, for example, in U. S.
Patent 3,400,371, the identifying address for a control unit and device, such as a
direct-access storage device (DASD), is encoded into an 8-bit field. The most
significant bits of the address identify the control unit on a given channel coupling
the control unit while the least significant bits identify the device. For example, a
control unit may have the address 1011XXXX (with the device address shown
with the X's), the valid addresses that this control unit must accept encompass
the range from 10110000 to 10111111. In this case, there are 16 unique device
addresses associated with this control unit. Another control unit may have an
address of 101XXXXX which in this case gives a range of 32 unique device
addresses. In the two foregoing examples, 10110000 is a valid address for both
control units. However, in the first example, the device address is 0000, while for
the second, the device address is 10000.
Since a single field contains both a control unit address and a device address
with a variable boundary therebetween, one must identify the end of one subfield
and the beginning of another. This is implemented by having a mask set such
that the control unit address oc...