TRICONEX 4329 Logic control module

Smode [1:0] - Scan Mode configuration control bits. This field is used to configure either the Auto Scan mode, the Single Scan mode, or the Random Access mode as shown in Table 3-8 on page 54. In Auto Scan mode the scan is re-armed and triggered each time the end of the buffer is reached. When the end of the buffer is reached in Single Scan mode, the scan is terminated until the next trigger event. In Random Access mode, the scan is disabled. At each trigger event a single channel, indicated by Groupc [5.0], is converted and the data placed in buffer location 0þ Gain Mode control bits. This field is used to configure the channel gains as shown in Table 3-7. Fixed gains apply to all active channels. In Auto Gain mode the gain programmed into the channel x Auto Gain location is applied to channel x

Bits 05 through 00:

 Groupc [5:0] - Channel group control bits. This field is used to select which group of channels will be active for scanning. It is also used to enter the desired channel in Random Access mode. If the buffer field is loaded with $00, $03, $07, $0C, $11, or $16 the entire buffer will be filled with the channel indicated by the group field. This is similar to Random Access, except the entire buffer is filled and not just the first location. Examples on how to use the Configuration Control Register are shown in the following paragraphs.

Examples on Using Configuration Control Register (CCR) 

The VMIVME-3122 has a buffer size of 1024 Words that can be accessed via the VMEbus. The configuration of this buffer may be manipulated using the Configuration Control Register located at Offset $0004. There are three terms used throughout this manual when discussing the configuration of the data buffer. The terms are: Buffer size: The VMEbus always has access to the entire set of 1024-words, but the user may program the number of buffer locations that will be updated when the VMIVME-3122 makes a scan of the selected inputs. Possible values: 16, 32, 64, 128, 256, 512, 1024. Block size: The Block size is the number of active channels that will be measured whenever the VMIVME-3122 makes a scan of the selected inputs.

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