Sundance SMT310Q - Manual (Page 20)

Version 2.1 Page 20 of 55 SMT310Q User Manual
5. Sundance Digital Bus (SDB)
A growing number of Sundance’s Modules have an on-board SDB. A description of
the SDB interface may be found on the Sundance web site at
www.sundance.com/html/pdf_info.htm .
The following register controls the carrier’s SDB.
D7 D6 D5 D4 D3 D2 D1 D0
X X OFFF IPFF RW RW RW RXNTX
Table 6: SDB Control Register
The SDB control and status register is located at BAR2 offset 00200260
16
. The bit
definitions are shown below:
RXNTX SDB Direction. The SDB direction is set using Jumper J18 (Figure 17) on the
SMT310Q, When the jumper is removed the SDB is set for receive mode; when the
jumper is present the SDB is set for transmit mode. This bit indicates the direction
set: 0=Receive, 1=Transmit.
RW General scratch bits
IPFF Input FIFO full: When set, a 16-bit value has been latched in the data register ready
for reading. This bit is automatically cleared on a read from the data register.
OPFF Output FIFO full: This bit is set when a 16-bit value is written to the FIFO and is
automatically cleared when it has been sent out of the SDB.
The SDB data register is located at BAR2 offset 00200240
16
. You can write 16-bit
values to this location to transfer them over the SDB interface as long as the OPFF
flag in the status register is clear and the J18 jumper is present.