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Universe II User Manual www.pen.phys.virginia.edu/daq/vme/universe_ii.pdf
2. program the VOWN bit in the MAST_CTL register to a value of 1 (see “Using ...... VMEbus, the user must release ownership by programming the VOWN bit to a ...
Universe IID User Manual www.idt.com/products/getDoc.cfm?docID=18713591
master given access to the bus (until the VOWN bit is cleared). ... 2. program the VOWN bit in the MAST_CTL register to a value of 1 (see ...
The VME Lock cycle is used, in combination with the VOWN bit in the “Master Control Register
(MAST_CTL)” on page 271, to lock resources on the VMEbus. The VME Lock cycle can be used by
the Universe II to inform the resource that a locked cycle is intended. The VOWN bit in the
MAST_CTL register can be set to ensure that when the Universe II acquires the VMEbus, it is the only
master given access to the bus (until the VOWN bit is cleared). It may also be necessary for the PCI
master to have locked the Universe II using the PCI LOCK_ signal.....
However, after the VME Lock cycle is complete, there is no guarantee that the Universe II remains
VMEbus master unless it has set the VOWN bit. If the Universe II loses VMEbus ownership, the
VMEbus resouce does not remain locked.
The following procedure is required to lock the VMEbus through an ADOH cycle:
1. If there is more than one master on the PCI bus, it may be necessary to use PCI LOCK_ to ensure
that the PCI master driving the ADOH cycle has sole PCI access to the Universe II registers and
the VMEbus
2. program the VOWN bit in the MAST_CTL register to a value of 1 (see “Using the VOWN bit” on
page 64)...
3. wait until the VOWN_ACK bit in the MAST_CTL register is a value of 1
4. generate an ADOH cycle with the Special Cycle Generator
5. perform transactions to be locked on the VMEbus
6. release the VMEbus by programming the VOWN bit in the MAST_CTL register to a value of 0
7. wait until the VOWN_ACK bit in the MAST_CTL register is a value of 0....
3.4.6 Using the VOWN bit
The Universe II provides a VMEbus ownership bit (VOWN bit in the “Master Control Register
(MAST_CTL)” on page 271) to ensure that the Universe II has access to the locked VMEbus resource
for an indeterminate period. The Universe II can be programmed to assert an interrupt on the PCI bus
when it acquires the VMEbus and the VOWN bit is set in the “PCI Interrupt Enable Register
(LINT_EN)” on page 242. While the VMEbus is held using the VOWN bit, the Universe II sets the
VOWN_ACK bit in the MAST_CTL register. The act of changing the VOWN_ACK bit from 0 to 1
generates and interrupt. The VMEbus Master Interface maintains bus tenure while the ownership bit is
set, and only releases the VMEbus when the ownership bit is cleared.
3.4.6.1 Reasons for Using the VOWN Bit
If the VMEbus Master Interface is programmed for RWD, through the VREL bit in “Master Control
Register (MAST_CTL)” on page 271, it may release the VMEbus when the PCI Target Channel has
completed a transaction. If exclusive access to the VMEbus resource is required for multiple
transactions, then the VMEbus ownership bit holds the bus until the exclusive access is no longer
required.
Alternatively, if the VMEbus Master Interface is programmed for ROR, the VMEbus ownership bit
ensures VMEbus tenure even if other VMEbus requesters require the VMEbus
Universe IID User Manual
-------------------------------------------------- Note added at 14 hrs (2011-07-23 14:31:33 GMT) --------------------------------------------------
Explanation: Tentatively I believe this is a typo, but looking at the context and the keyboard I cannot figure out what it should be. Maybe someone else will.
Mike
Michael Powers (PhD) United States Local time: 15:51 Native speaker of: English PRO pts in category: 12
The translation workplace 
peer agreement (net): +5
