Vax 613 0S Instruction Manual Page 115

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Bits Access Reset Function
15 R/W 0 10Base-T TPIC Test Mode. For testing purposes. Must be
clear (default) in normal operation. Must be 1, if the 10Base-T
loopback connector is installed.
16 R/W 0 LANCE DMA enable. When set, enables LANCE DMA, so that
the Ethernet can begin functioning; when clear, disables same.
17 Reserved
18 Reserved
19 R/W 0 ISDN receive DMA enable. When set , enables the ISDN receive
DMAs; when clear, disables same.
20 R/W 0 ISDN transmit DMA enable. When set, enables the ISDN
transmit DMAs; when clear, disables same.
21 Reserved
22 Reserved
23 Reserved
24 R/W 0 Byte 0 value for single mode ROM access
25 R/W 0 Byte 1 value for single mode ROM access
26 R/W 0 Single-mode ROM Access. When set, enables single-mode ROM
Access. When clear, an access to the the ROM slot causes four
read operations to be performed. Setting does not affect write
operations to ROM space; they are always single-access.
27 R/W 0 Fast Mode. When clear, places the IOCTL in Fast mode (25
MHz). When set, places the IOCTL in Slow mode (12.5 MHz).
Must be set to 1 for 300 models. On reset, equals 0 and must
not be changed in 400/500/600/700/800/900 models; in 300 models
must be set to 1 again.
28 R/W 0 Unused in 300 models. Printer port receive DMA enable. When
set, enables the printer port to receive DMA from SCC(1); when
clear, disables same.
29 R/W 0 Unused in 300 models. printer port transmit DMA enable. When
set, enables the printer port to transmit DMA to SCC(1)-B; when
clear, disables same.
30 R/W 0 Communication port 1 receive DMA. When set, enables
communication port 1 receive DMA from SCC(0)-B; when clear,
disables same.
31 R/W 0 Communication port 1 transmit DMA. When set, enables
communication port 1 transmit DMA to SCC(0)-B; when clear,
disables same.
IOCTL ASIC and System Registers 7–11
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