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CD1865 Scheda tecnica(PDF) 45 Page - Intel Corporation |
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CD1865 Scheda tecnica(HTML) 45 Page - Intel Corporation |
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45 / 150 page  Intelligent Eight-Channel Communications Controller — CD1865 Datasheet 45 devices. In multiple-device systems, either disable daisy chaining on all devices and ‘fish’ each individually, or disable daisy chaining on the last device only and ‘fish’ the device at the beginning of the chain. Both methods of acknowledging service requests can be used interchangeably. It is usually advantageous to use Mixed mode. For example, after receiving an interrupt and servicing it in the normal manner, the host should read the Service Request Status register (SRSR) to see if other requests are pending. If so, the host can acknowledge by reading the appropriate Request Acknowledge register (RRAR, TRAR, and MRAR) and proceed to service the request. This avoids the time required for the host to exit its interrupt routine, only to re-enter it immediately for the next request. |
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