Texas Instruments TMS320TCI648x manual Lettermask, For a single-segment message, Mailbox

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							SRIO Registers
			Figure 113. Mailbox to Queue Mapping Register Pair
Mailbox to Queue Mapping Register L n (RXU_MAP_L n )
31	30	29	24	23	22	21	16
LETTER_MASK			MAILBOX_MASK		LETTER		MAILBOX
	R/W-11		R/W-111111		R/W-00		R/W-000000
15							0
			SOURCEID
			R/W-0000h

Mailbox to Queue Mapping Register H n (RXU_MAP_H n )

31

Reserved

R-0

10	9	8	7	6	5	2	1	0
Reserved		TT	Reserved		QUEUE_ID		PROMISCUOUS	SEGMENT_
								MAPPING
R-0		R/W-01	R-00		R/W-0000		R/W-0	R/W-0

LEGEND: R/W = Read/Write; R = Read only; -n= Value after reset

Table 119. Mailbox-to-Queue Mapping Register Ln (RXU_MAP_Ln) Field Descriptions

Bit	Field	Value	Description
31–30	LETTER_MASK	00b–11b	Letter mask. Each 0 in this field indicates a don'tcare bit in the letter
			number. This allows mapper n to handle a set or range of letter numbers
			rather than only one.
29–24	MAILBOX_MASK		Mailbox mask. Each 0 in this field indicates a don'tcare bit in the mailbox
			number. This allows mapper n to handle a set or range of mailbox numbers
			rather than only one.
			For a single-segment message:
		000000b–111111b	6-bit mailbox mask value
			For a multi-segment message:
		xxxx00b–xxxx11b	3-bit mailbox mask value
23–22	LETTER	00b–11b	Letter number. If LETTER_MASK = 11b, this is the only letter number
			handled by mapper n. If LETTER_MASK is not 11b, mapper n handles the
			set of letter numbers formed with the mask bit(s).
21–16	MAILBOX		Mailbox number. If MAILBOX_MASK = 111111b, this is the only mailbox
			number handled by mapper n. If MAILBOX_MASK is not all 1s, mapper n
			handles the set of mailbox numbers formed with the mask bit(s).
			For a single-segment message:
		000000b–111111b	6-bit mailbox number (0 to 63)
			For a multi-segment message:
		xxxx00b–xxxx11b	3-bit mailbox number (0 to 3)
15–0	SOURCEID	0000h–FFFFh	Source identification number. The SOURCEID field is used to indicate which
			external device has access to mapper n and its corresponding queue. A
			comparison is performed between the sourceID of the incoming message
			packet and the SOURCEID field. If the values do not match, an ERROR
			response is sent to the sender, and the transaction is logged in the logical
			layer error management capture registers.

Table 120. Mailbox-to-Queue Mapping Register Hn (RXU_MAP_Hn) Field Descriptions

Bit	Field	Value	Description
31–10	Reserved	0	These read-only bits return 0s when read.
9–8	TT		Transport type
		0	During the sourceID comparison, the incoming sourceID is compared
			with the 8 LSBs of the SOURCEID field of RXU_MAP_Ln.
		1	During the sourceID comparison, the incoming sourceID is compared
			with all 16 bits of the SOURCEID field of RXU_MAP_Ln.
SPRUE13A –September 2006			Serial RapidIO (SRIO)	179
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