Bridge Link (CN4)
The Bridge Link connector allows devices that requires Legacy/ISA interrupts to inteface with the cpuModule. When ISA devices are installed in the system (via a PCI to ISA bridge card), the Bridge Link connector provides Legacy/ISA DMA request signals, as well as a serial interrupt signal which permits access to all available system interrupts.
Multiple devices may utilize the serial interrupt signal, SERIRQ, which is decoded on the cpuModule. Only one device may use the DMA request and grant signal pair.
Table 29 Bridge Link (CN4)
Pin | Signal | Function |
|
|
|
1 | GND | Ground |
|
|
|
2 | DMAREQ | Legacy/ISA DMA Request |
|
|
|
3 | SERIRQ | Serial Interrupt Request |
|
|
|
4 | DMAGNT | Legacy/ISA DMA Grant |
|
|
|
Facing the connector pins, the pinout is:
31
SERIRQ
GND
DMAGNT
DMAREQ
42
46 CMX58886CX cpuModule |