XVME-653/658 Manual
4-4
Note
PCI memory slave access = VMEbus master access
PCI memory master access = VMEbus slave access
System Resources
The XVME-653/658 automatically provides slot 1 system resource functions. The sys-
tem resource functions are explained in the Universe manual. (Contact Tundra at
for a .pdf version of the Universe II manual.) This function can be dis-
abled using jumper J1. Refer to
Jumper Settings
in Chapter 2 (p. 2-2) for more infor-
mation.
VMEbus Master Interface
The XVME-653/658 can act as a VMEbus master by accessing a PCI slave channel or by
the DMA channel initiating a transaction. The Universe chip contains eight PCI slave
images. Slave images 0 and 4 have a 4 KB resolution; the others (1-3, 5-7) have a 64 KB
resolution. Slave images 0 through 3 have been implemented on the XVME-653/658.
Slave images 4-7, if required, need to be implemented by the user. The VMEbus master
can generate A16, A24, or A32 VMEbus cycles for each PCI slave image.
The address mode and type are programmed on a PCI slave image basis. The PCI mem-
ory address location for the VMEbus master cycle is specified by the Base and Bound
address. The VME address is calculated by adding the Base address to the Translation
Offset address. All PCI slave images are located in the PCI bus memory space.
All VMEbus master cycles are byte-swapped by the Universe chip to maintain address
coherency. For more information on the Xycom Automation software selectable byte-
swapping hardware on the XVME-658 and the XVME-653/31x modules, refer to
Caution
PCI slave images mapped to a system DRAM area will access the system
DRAM, not the PCI slave image. Also, the Universe configuration reg-
ister has a higher priority than the PCI slave images. As a result, if the
PCI slave image and the Universe configuration registers are mapped
into the same memory area, the configuration registers will take prece-
dence.
VMEbus Slave Interface
The XVME-653/658 can act as a VMEbus slave by configuring the VMEbus slave im-
ages. There are eight PCI slave images Slave images 0 and 4 have a 4 KB resolution; the
others (1-3, 5-7) have a 64 KB resolution. Slave images 0 through 3 have been imple-
mented on the XVME-653/658. Slave images 4-7, if required, need to be implemented by
the user. The slave can respond to A16, A24, or A32 VMEbus cycles for each VMEbus
slave image.
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