Modifying the Environment
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3-19
3
F-Page (VMEbus A24) Enable
[Y/N]
Y
Yes, Enable the F-Page Address Decoder.
F-Page (VMEbus A24) Control
02
Defines the access characteristics for the
address space defined with the F-Page address
decoder. Default is $02.
ROM Access Time Code
04
Defines the ROM access time. The default is
$04, which sets an access time of five clock
cycles of the local bus.
Flash Access Time Code
03
Defines the Flash access time. The default is
$03, which sets an access time of four clock
cycles of the local bus.
MCC Vector Base
VMEC2 Vector Base #1
VMEC2 Vector Base #2
05
06
07
Base interrupt vector for the component
specified. Default: MC2chip = $05, VMEchip2
Vector 1 = $06, VMEchip2 Vector 2 = $07.
VMEC2 GCSR Group Base
Address
D2
Specifies group address ($FFFFXX00) in Short
I/O for this board. Default = $D2.
VMEC2 GCSR Board Base
Address
00
Specifies base address ($FFFFD2XX) in Short
I/O for this board. Default = $00.
VMEbus Global Time Out Code
01
Controls VMEbus timeout when the
MVME172P4 is system controller. Default $01
= 64
µ
s.
Local Bus Time Out Code
02
Controls local bus timeout. Default $02 = 256
µ
s.
VMEbus Access Time Out Code
02
Controls the local-bus-to-VMEbus access
timeout. Default $02 = 32 ms.
Table 3-3. ENV Command Parameters (Continued)
ENV Parameter and Options
Default
Meaning of Default
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