Efficiency of compression of data pages

摘要

A technique for controlling scan access of multiple scan devices (including or more slave scan devices and a master scan device) to a scan chain includes sending, by a requesting slave scan device included in the one or more slave scan devices, a first request for access to the scan chain to the master scan device. The master scan device and the one or more slave scan devices are connected to the scan chain. The technique also includes receiving, at the requesting slave scan device, an evaluation result from the master scan device and accessing, by the requesting slave scan device, the scan chain in response to the evaluation result indicating access granted. Finally, the technique includes sending, by the requesting slave scan device, one or more second requests for access to the scan chain to the master scan device in response to the evaluation result indicating access denied.

主权项

1. A system, comprising:
a scan chain; a master scan device coupled to the scan chain and configured to control access to the scan chain; one or more slave scan devices coupled to the master scan device and the scan chain, wherein a requesting slave scan device included in the one or more slave scan devices is configured to:
send a first request for access to the scan chain to the master scan device;receive an evaluation result from the master scan device;access the scan chain in response to the evaluation result indicating access granted; andsend one or more second requests for access to the scan chain to the master scan device in response to the evaluation result indicating access denied.