Status Register (Stat); Status Register (Stat) Field Descriptions - Texas Instruments SPRU938B User Manual

VLYNQ Port Registers
3.3

Status 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
31 28
Reserved
R-0
14
RXCURRENTSAMPLE
7 6
LERROR NFEMPTY3
W1C-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
Bit Field
31-28 Reserved
27-24 SWIDTHIN
23-20 SWIDTHOUT
19-15 Reserved
14-12 RXCURRENTSAMPLE
11 RTM
10 IFLOW
9 OFLOW
28 VLYNQ Port
Figure 11 and described in
Figure 11. Status Register (STAT)
27
SWIDTHIN
R-0
12
R-0
5 4
NFEMPTY2 NFEMPTY1
R-0 R-0
Table 8. Status Register (STAT) Field Descriptions
Value Description
0 Reserved. Always read as 0. Writes have no effect.
Size of the inbound serial data. Indicates the number of receive pins that are being used to
0-Fh
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
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
0 Reserved. Always read as 0. Writes have no effect.
0-Fh Current RTM sample. Indicates the current clock sample value used by RTM.
1 RTM enable. Always read as 1. Indicates that the VLYNQ module on the DM643x DMSoC
has the receive timing manager (RTM).
Inbound flow control.
0 Free to transmit.
Indicates that a flow control enable request has been received and has stalled transmit until
1
a flow control disable request is received.
Outbound flow control. Indicates the status of the two inbound FIFOs (FIFO1 or FIFO2).
0 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)
1
and a flow control enable request has been sent to the remote device.
Table 8.
24 23
SWIDTHOUT
R-0
11 10
RTM IFLOW
R-1 R-0
3
NFEMPTY0 SPEND
R-0 R-0
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20 19
Reserved
R-0
9
OFLOW
R-0
2 1
MPEND
R-0
SPRU938B – September 2007
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15
8
RERROR
W1C-0
0
LINK
R-0