OPERATION
•
GT Memory Offset
- The offset in GT200 VME physical memory to which the
VME Address maps. In conjunction with the window size, this option may be
used to allow access to restricted portions of the available GT200 VME memory.
For the A16 and A24 address spaces, this offset can be used to gain access to
portions of GT200 VME memory that are above the VME addressable range
(A16 only provides 64 KB of addressable memory and A24 provides 16 MB).
See also the note below regarding granularity.
It is not required that more than one window be enabled. All 128 MB of GT200 VME
memory can be mapped in a single window using A32 or A64 address spaces.
Also, if two VME address windows overlap within the same address space, the lower
numbered window has priority.
NOTE:
Each address space has an alignment restriction for the VME address and GT
memory offset, and a granularity restriction for the window size. The A64 and A32
address spaces require 64KB (0x10000) alignment and granularity. The A24 and A16
address spaces require 4KB (0x1000) and 16B (0x10) alignment and granularity,
respectively.
4.4.5.5 VME Slot Number Configuration
The user may specify the VME slot number of GT200 VME. The factory default setting
is to auto-detect the slot number using geographical or auto-slot ID detection features
provided by the VME backplane. If your VME backplane does not support geographical
or auto-slot ID features, you can configure the slot number by selecting "VME
Configuration Menu" followed by "Configure VME Interface" from the menu system.
Enter the desired slot number (1-21) when prompted, or zero (0) for auto-detection. You
must reset GT200 VME for the slot number to be changed.
4.4.6 GT Network Interface Configuration
GT network interface options may be configured from the menu system by selecting “GT
Configuration Menu” followed by “Configure GT Interface.” The available options are:
•
Node ID
– The network identifier of the GT node. The user should configure
each node on the network with a unique node ID. The node ID is used in the
removal of traffic from the network, and in identifying native traffic.
•
Receive Interface
– Selects the transceiver used for receiving network traffic.
•
Receive Path
– When turned on, allows data received from the network to be
written to GT memory. When turned off, data received from the network is not
written to GT memory.
•
Transmit Path
- When turned on, allows data written locally to GT memory to
also be transmitted to the network. When turned off, prevents locally written data
from being transmitted to the network.
•
Retransmit Path
– When turned on, allows non-native data received on the
network to be retransmitted to the network. When turned off, prevents
retransmission of received data.
•
Write-last
– When turned on, locally written data will be written to local GT
memory after it traverses the network and is received at the receive interface.
Copyright 2005
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GT200 VME Hardware Reference
Содержание GT200 VME
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