CD1865 datasheet(45/150 Pages) INTEL

Part #	CD1865

Description	Intelligent Eight-Channel Communications Controller

PDF	150 Pages

Scroll/Zoom	100%

Manufacturer	INTEL [Intel Corporation]

Direct Link	http://www.intel.com

Logo

45 / 150 page

Intelligent Eight-Channel Communications Controller — CD1865

Datasheet

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.

CD1865 Datasheet(PDF) 45 Page - Intel Corporation