Справочник Пользователя для Nortel Networks Circuit Card
Page 684 of 906
NT8D41BA Quad Serial Data Interface Paddle Board
Other logic on the card includes baud rate generators, RS-232-C driver/
receiver pairs, and the switches and logic needed to configure each UART.
receiver pairs, and the switches and logic needed to configure each UART.
System considerations
In dual-processor systems, the QSDI paddle board will behave differently
depending on which backplane socket it is installed. Installing the paddle
board into a socket in the network area of the backplane allows it to work
when either of the system processors is active. Installing the paddle board into
a socket in the CPU area of the backplane allows it to work only when that
CPU is active.
depending on which backplane socket it is installed. Installing the paddle
board into a socket in the network area of the backplane allows it to work
when either of the system processors is active. Installing the paddle board into
a socket in the CPU area of the backplane allows it to work only when that
CPU is active.
Figure 162
NT8D41BA QSDI paddle board block diagram
NT8D41BA QSDI paddle board block diagram
UART
no. 1
UART
no. 2
UART
no. 3
UART
no. 4
UARTs
Address
decode logic
TD
RD
TD
RD
TD
RD
TD
RD
RS-232-C
drivers and receivers
Clock and bit
rate select logic
Processor
bus
553-5986
Port 1
Port 2
Port 3
Port 4
J1
J2