Texas Instruments TMS320TCI648x manual Prescalerselect

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SRIO Registers

Table 43. Peripheral Settings Control Register (PER_SET_CNTL) Field Descriptions (continued)

	Bit	Field	Value	Description
	17–15	TX_PRI1_WM	000b–111b	Transmit credit threshold. Sets the required number of logical layer TX
				buffers needed to send priority 1 packets across the UDI. This is valid
				for all ports in 1x mode only.
				Required buffer count for transmit credit threshold 1 value
				(TX_PRI1_WM):
				∙ 000→8, 7, 6, 5, 4, 3, 2, 1 (effectively lets all of this priority pass)
				∙ 001→8, 7, 6, 5, 4, 3, 2
				∙ 010→8, 7, 6, 5, 4, 3
				∙ 011→8, 7, 6, 5, 4
				∙ 100→8, 7, 6, 5
				∙ 101→8, 7, 6
				∙ 110→8, 7
				∙ 111→8
	14–12	TX_PRI0_WM	000b–111b	Transmit credit threshold. Sets the required number of logical layer TX
				buffers needed to send priority 0 packets across the UDI. This is valid
				for all ports in 1x mode only.
				Required buffer count for transmit credit threshold 0 value
				(TX_PRI0_WM):
				∙ 000→8, 7, 6, 5, 4, 3, 2, 1 (effectively lets all of this priority pass)
				∙ 001→8, 7, 6, 5, 4, 3, 2
				∙ 010→8, 7, 6, 5, 4, 3
				∙ 011→8, 7, 6, 5, 4
				∙ 100→8, 7, 6, 5
				∙ 101→8, 7, 6
				∙ 110→8, 7
				∙ 111→8
	11–9	CBA_TRANS_PRI	000b–111b	DSP system transaction priority. 000b – Highest Priority … 111b –
				Lowest Priority.
	8	1X_MODE		This register bit determines the UDI buffering setup (priority versus port).
				For additional programming information, see Section 2.3.13.2.
			0	UDI buffers are priority based
			1	UDI buffers are port based. This mode must be selected when using
				more than one 1x port
	7–4	PRESCALER_SELECT		Internal frequency prescaler, used to drive the request to response
				timers. These 4 bits are the prescaler reload value allowing division of
				the DMA clock by a range from 1 up to 16. Setting should reflect the
				device DMA frequency in MHz.
			0000b	Sets the internal clock frequency Min 44.7 and Max 89.5
			0001b	Sets the internal clock frequency Min 89.5 and Max 179.0
			0010b	Sets the internal clock frequency Min 134.2 and Max 268.4
			0011b	Sets the internal clock frequency Min 180.0 and Max 360.0
			0100b	Sets the internal clock frequency Min 223.7 and Max 447.4
			0101b	Sets the internal clock frequency Min 268.4 and Max 536.8
			0110b	Sets the internal clock frequency Min 313.2 and Max 626.4
			0111b	Sets the internal clock frequency Min 357.9 and Max 715.8
			1000b	sets the internal clock frequency Min 402.7 and Max 805.4
			1001b	Sets the internal clock frequency Min 447.4 and Max 894.8
			1010b	Sets the internal clock frequency Min 492.1 and Max 984.2
			1011b	Sets the internal clock frequency Min 536.9 and Max 1073.8
			1100b	Sets the internal clock frequency Min 581.6 and Max 1163.2
			1101b	Sets the internal clock frequency Min 626.3 and Max 1252.6
			1110b	Sets the internal clock frequency Min 671.1 and Max 1342.2
			1111b	Sets the internal clock frequency Min 715.8 and Max 1431.6
114	Serial RapidIO (SRIO)			SPRUE13A –September 2006

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