Texas Instruments TMS320C645x manual Port Control CSR n SP nCTL Field Descriptions, Nable

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				SRIO Registers
	Table 115. Port Control CSR n (SPn_CTL) Field Descriptions (continued)
Bit	Field	Value	Description
21	INPUT_PORT_E		Input port receive enable
	NABLE
		0b	Port is stopped and only enabled to route or respond I/O logical MAINTENANCE packets,
			depending upon the functionality of the processing element. Other packets generate
			packet-not-accepted control symbols to force an error condition to be signaled by the sending
			device. Control symbols are not affected and are received and handled normally.
		1b	Port is enabled to respond to any packet
20	ERROR_CHECK		This bit disables all RapidIO transmission error checking. Device behavior when error checking and
	_DISABLE		recovery is disabled and an error condition occurs is undefined.
		0b	Error checking and recovery is enabled
			Error checking and recovery is disabled	1b
19			SendMULTICASTincomingPARTICIPANTMulticast-event control symbols to this port (multiple port devices only)
18-4	Reserved		Reserved
3	STOP_PORT_FL		When set, this bit causes the port to set the Port Error bit in the Port n Error and Status CSR and
	D_ENC_ENABLE		stop attempting to send packets to the connected device when the Output Failed-encountered bit is
			set. Packets are discarded if the Drop Packet Enable bit is set. When cleared, the port continues to
			attempt to transmit packets to the connected device if the Output Failed-encountered bit is set.
2	DROP_PACKET_		When set, this bit allows the output port to drop packets that are acknowledged with a
	ENABLE		packet-not-accepted control symbol when the error failed threshold is exceeded. If the port "heals",
			and the current error rate falls below the failed threshold, the output no longer drops packets
			(switch devices only). When cleared, the output port continues to try to transmit packets that have
			been rejected due to transmission errors
1	PORT_LOCKOU		Port Lockout: When cleared, this port is enabled to issue any packets. When set, this port is
	T		stopped and is not enabled to issue or receive any packets; the input port can still follow the
			training procedure and can still send and respond to link-requests; all received packets return
			packet-not-accepted control symbols to force an error condition to be signaled by the sending
			device.
0	PORT_TYPE		Port type. This indicates the port type, parallel or serial (read only).
		0b	Parallel port
		1b	Serial port

SPRU976 –March 2006 Serial RapidIO (SRIO) 189

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