Tornado

4
Projects
Figure 4-45
NetROM Connection Macros
4
WDB_NETROM_NUM_ACCESS
The value 1 indicates that pod zero is accessed only once when a word of
memory is read.
WDB_NETROM_POLL_DELAY
The value 2 specifies that the NetROM is polled every two VxWorks clock ticks
to see if data has arrived from the host.
WDB_NETROM_ROMSIZE
The default value is ROM_SIZE, a makefile macro that can be set for a specific
build. See Makefile Macros, p.131.
WDB_NETROM_TYPE
The default value of 400 specifies the old 400 series.
WDB_NETROM_WIDTH
The value 1 indicates that the ROMs support 8-bit access. To change this to 16-
or 32-bit access, specify the value 2 or 4, respectively.
The size of the NetROM dual-port RAM is 2 KB. The NetROM permits this 2 KB
buffer to be assigned anywhere in the pod 0 memory space. The default position
for the NetROM dual-port RAM is at the end of the pod 0 memory space. The
following line in target/src/config/usrWdb.c specifies the offset of dual-port RAM
from the start of the ROM address space.
dpOffset = (WDB_ROM_SIZE - DUALPORT_SIZE) * WDB_NETROM_WIDTH;
If your board has more than one ROM socket, this calculation gives the wrong
result, because the VxWorks macro ROM_SIZE describes the total size of the ROM
139