6-12
BajaPPC-750: VMEbus Interface
6.2.6 VMEbus Master Image Registers
The Universe allows up to eight VMEbus master (PCI slave) images. Each image
has a control register, base address register, bound address register, and a transla-
tion offset register. All these registers have 64-kilobytes of resolution, except for
the LSI0 and LSI4 register sets, which have a 4-kilobyte resolution. Since the bit
assignments are similar for all eight VMEbus master (PCI slave) images, only
image 0 will be discussed here. Refer to the
Universe User’s Manual
for additional
details.
The PCI Slave Image 0 Base Address Register, LSI0_BS, at hex offset 104
16
defines
the lowest address in the range to be decoded. Bits BS[31:12] hold the base
address, and bits [11:0] are reserved.
The PCI Slave Image 0 Bound Address Register, LSI0_BD, at hex offset 108
16
defines the window size for the slave image. Bits BD[31:12] hold the bound
address, and bits [11:0] are reserved.
NOTE.
Since the MPC106 memory controller currently issues a retry upon
detecting a memory select error, the maximum slave window size
should be limited to the size of the desired memory-mapped region.
The slave window can make any portion of the BajaPPC-750 memory
map available on the VMEbus.
VARBTO
VMEbus arbitration timeout in microseconds. (SYSCON support)
Binary 00=disabled, 016µs, 10=256µs, all others=reserved.
SW_LRST
Software PCI reset characteristic. PCI masters should not write to this bit.
Binary 0=no effect, 1=initiate LRST#. (Read always returns 0.)
SW_SRST
Software VMEbus SYSRESET characteristic. VMEbus masters should not
write to this bit.
Binary 0=no effect, 1=initiate SYSRST*. (Read always returns 0.)
BI
BI Mode. (Also, this bit is affected by VIRQ1*, if enabled.)
Binary 0=disabled, 1=enabled.
ENGBI
Enable global BI-mode initiator.
Binary 0=VIRQ1 assertion ignored, 1=VIRQ1 assertion activates BI mode.
RESCIND
Rescinding DTACK Enable.
This field is no longer used. The Universe always rescinds DTACK.
SYSCON
Allow Universe to function as VMEbus system controller.
Binary 0=disabled, 1=enabled.
V64AUTO
Initiate VME64 Auto ID slave participation by Universe.
Binary 0=no effect, 1=initiate sequence.
Содержание BajaPPC-750
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