required. * .--. / / ` + | | ' \ \__, * + '--' * + /\ + .' '. * * /======\ + ;:. _ ; |:. (_) | |:. _ | + |:. (_) | * ;:. ; .' \:. / `. / .-'':._.'`-. \ |/ /||\ \| _..--"""````"""--.._ _.-'`` ``'-._ __ __ _ __ / _| /_/ | | /_/ | |_ _ _ ___ ___ ___ __ _ ___| ___ | _| | | / __|/ _ \/ _ \ / _` |/ _ \ |/ \ | | | |_| \__ \ __/ __/ | (_| | __/ | __/ Field Size Description direction 1b if '1', the device should respond with data type 2b specifies whether this request is of a standard type or not recipient 5b encodes the context in which this request should be considered; request 8b specifies the request number length 16b specifies the maximum amount of data to be transferred