Artesyn MVME5100, Programmer'S Reference Manual, Page: 162 / 318

Hawk PCI Host Bridge & Multi-Processor Interrupt Controller
MVME5100 Single Board Computer Programmer’s Reference (6806800H17B )
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REN
Read Enable. If set, the corresponding PCI Slave is enabled for read transactions.
RMFTx
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.
RXFTx
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 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 above:
Table 2-62 RMFTx Field
RMFT/RXFT Subsequent Prefetch FIFO Threshold
00 0 Cache lines
01 1 Cache line
10 2 Cache lines
11 3 Cache lines
Table 2-63 WXFTx Field
WXFT Write FIFO Threshold
00 4 Cache lines
01 3 Cache lines
10 2 Cache lines
11 1 Cache lines