Filter
Top Products
1-20 Computer Group Literature Center Web Site
Board Description and Memory Maps
1
interrupts may be tailored to meet user requirements. The
ST16C554DCQ64 provides constant active interrupt outputs but do not
offer TXRDY/RXRDY outputs. Refer to the EXAR ST16C554D data
sheet for additional information.
COM 1 is an RS232 port and the TTL-level signals are routed through
appropriate EIA-232 drivers and receivers to an RJ45 connector on the
front panel. COM2 is also an RS232 port which is routed to an onboard
planar header for rear I/O access via option inductors/resistors. Unused
control inputs on COM1 and COM2 are wired active. The reference clock
frequency for the QUART is 1.8432 MHz. All UART ports are capable of
signaling at up to 115 Kbaud.
Real-Time Clock and NVRAM
The Real-Time Clock/NVRAM/Watchdog Timer is implemented using a
SGS-Thompson M48T37V Timekeeper SRAM, and M4T28-BR12SH1
SnapHat battery. Refer to the M48T37V data sheets for additional
programming information.
Table 1-13. M48T37V Access
Address Offset Function - 0xF1110000
0x0000 - 0x5FFF Available for users
0x0100 - 0x0200 VxWorks "bootline"
0x6000 - 0x6FFF Reserved (MOTLoad expansion)
0x7000 - 0x7FEF MOTLoad use (GEVs)
0x7FF0 0 0x7FFF Real Time Block