USPIIi-1v Hardware Manual
5-4
Themis Computer
Figure 5-1.
Universe IIB Architectural Diagram
The Universe IIB’s VMEbus Master Interface supports all of the addressing and data transfer modes as
specified by the VME64 specification. The Universe IIB does not support the A64 mode and modes intended
to augment the 3U applications, i.e. A40 and MD32. The Universe IIB is compatible with all the VMEbus
modules that conform to pre-VME64 specification. The Universe IIB as the VMEbus Master supports RMW,
and ADOH. The Universe IIB accepts BERR# and DTACK# as cycle terminations from the VMEbus.The
Universe IIB does not accept the RETRY# as a termination from the VMEbus Slave. DTACK# indicates the
successful completion of a transaction. The Universe IIB utilizes the ADOH cycle to implement the VMEbus
Lock command allowing a PCI bus master to lock the VMEbus resources.
5.3.4
VMEbus First Slot Detector
As defined by the VME64 specification, the Universe IIB samples the BG3IN# right after the reset to
determine if the USPIIi-1v resides in slot 1. If the BG3IN# is sampled low right after the reset, the USPIIi-1v
board becomes the SYSCON. Otherwise the SYSCON Module of the Universe IIB is disabled. The software
can set or clear the SYSCON bit the MISC_CTL register of the Universe IIB. The definition of the
MISC_CNT register is provided in Table 5-2, "Universe IIB Miscellaneous Control Register (MISC_CTL),"
on page 5-4. The offset of this register is 0x404.
Table 5-2.
Universe IIB Miscellaneous Control Register (MISC_CTL)
a
BIts
Name
Description
Reset
State
Access
[31:28]
VBTO
VMEbus Time-out:
0000 = Disable; 0001 = 16
µ
s; 0010 =
32 µ
s; 0011 = 64
µ
s;
0100 = 128
µ
s; 0101 = 256
µ
s; 0110 = 512
µ
s;
0111 = 1024
µ
s; Others = RESERVED
0011
R/W
26
VARB
VMEbus Arbitration Mode: 0 = Round Robin; 1 = Priority
0
R/W
PCI
Master
PCI
PCI
Interrupts
Slave
VME
Slave
VME
VME
Interrupts
Master
Bi-Directional DMA FIFO
posted writes
posted writes with FIFO
Interrupt Handler
Bi-Directional DMA FIFO
pre-fetch reads
coupled read
VMEbus Slave Channel
coupled read logic
Interrupter
Interrupt Channel
PCI Bus Slave Channel
PCI Bus
VMEbus
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