Texas Instruments SPRU938B manual Status Register Stat Field Descriptions

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VLYNQ Port Registers

3.3Status Register (STAT)

The status register (STAT) is used to detect conditions that may be of interest to the system designer. The STAT is shown in Figure 11 and described in Table 8.

Figure 11. Status Register (STAT)

31	28	27	24	23	20	19	15
Reserved		SWIDTHIN		SWIDTHOUT		Reserved
	R-0		R-0		R-0		R-0
14			12	11	10	9	8
	RXCURRENTSAMPLE			RTM	IFLOW	OFLOW	RERROR
		R-0		R-1	R-0	R-0	W1C-0
7	6	5	4	3	2	1	0
LERROR	NFEMPTY3	NFEMPTY2	NFEMPTY1	NFEMPTY0	SPEND	MPEND	LINK
W1C-0	R-0	R-0	R-0	R-0	R-0	R-0	R-0

LEGEND: R/W = Read/Write; R = Read only; W1C = Write 1 to clear bit; -n= value after reset; x= reset value is indeterminate

Table 8. Status Register (STAT) Field Descriptions

Bit	Field	Value	Description
31-28	Reserved	0	Reserved. Always read as 0. Writes have no effect.
27-24	SWIDTHIN	0-Fh	Size of the inbound serial data. Indicates the number of receive pins that are being used to
			establish the serial interface.
		0	No pins used
		1h	1	RX pin used
		2h	2	RX pins used
		3h	3	RX pins used
		4h	4	RX pins used
		5h-Fh	Reserved
23-20	SWIDTHOUT	0-Fh	Size of the outbound serial data. Indicates the number of transmit pins that are being used
			to establish the serial interface.
		0	No pins used
		1h	1	TX pin used
		2h	2	TX pins used
		3h	3	TX pins used
		4h	4	TX pins used
		5h-Fh	Reserved
19-15	Reserved	0	Reserved. Always read as 0. Writes have no effect.
14-12	RXCURRENTSAMPLE	0-Fh	Current RTM sample. Indicates the current clock sample value used by RTM.
11	RTM	1	RTM enable. Always read as 1. Indicates that the VLYNQ module on the DM643x DMSoC
			has the receive timing manager (RTM).

10 IFLOW

0

1

9 OFLOW

0

1

Inbound flow control.

Free to transmit.

Indicates that a flow control enable request has been received and has stalled transmit until a flow control disable request is received.

Outbound flow control. Indicates the status of the two inbound FIFOs (FIFO1 or FIFO2). Indicates that the internal flow control threshold is not yet reached.

Indicates that the internal flow control threshold has been reached (FIFO1 or FIFO2 is full) and a flow control enable request has been sent to the remote device.

28	VLYNQ Port	SPRU938B –September 2007
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