Texas Instruments VLYNQ Port - Manual (Page 29)

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3.3 Status Register (STAT)
VLYNQ Port Registers
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 9 .
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 9. 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 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
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 DM644x DMSoC
has the receive timing manager (RTM).
10 IFLOW 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.
9 OFLOW 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.
SPRUE36A – September 2007 VLYNQ Port 29
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