Motorola MVME5100 Programmer's Reference Manual page 142

INV
GBL
RAEN
WPEN
WEN
REN
RMFTx
RMFT/RXFT
RXFTx
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Invalidate Enable. If set, the PPC master will issue a
transfer type code which specifies the current transaction
should cause an invalidate for each PPC transaction
originated by the corresponding PCI slave. The transfer
type codes generated are shown in Table 2-3.
Global Enable. If set, the PPC master will assert the
GBL_ pin for each PPC transaction originated by the
corresponding PCI slave.
Read Ahead Enable. If set, read ahead is enabled for the
corresponding PCI slave.
Write Post Enable. If set, write posting is enabled for the
corresponding PCI slave.
Write Enable. If set, the corresponding PCI slave is
enabled for write transactions.
Read Enable. If set, the corresponding PCI slave is
enabled for read transactions.
Read Multiple FIFO Threshold. This field is used by
the PHB to determine a FIFO threshold at which to
continue prefetching data from local memory during PCI
read multiple transactions. This threshold applies to
subsequent prefetch reads since all initial prefetch reads
will be four cache lines. This field is only applicable if
read-ahead has been enabled. The encoding of this field is
shown in the table below.
Subsequent Prefetch FIFO Threshold
00
01
10
11
Read Any FIFO Threshold. This field is used by the
PHB to determine a FIFO threshold at which to continue
prefetching data from local memory during PCI read and
read line transactions. This threshold applies to
subsequent prefetch reads since all initial prefetch reads
0 Cache lines
1 Cache line
2 Cache lines
3 Cache lines
Registers
2
2-103