We are debugging a PCI board and met some difficulties. The main chip is PCI 9052(for PCI bus), the local device is SJA1000 (for can bus). We used
8-bit local bus (LAD[7:0]) as data-address multiplexed-mode, and using this local bus for PCI to communicate with SJA1000. Questions as follow:
- How to use the pin LBE[3:0], in the 8-bit multiplexed mode.
- The difficulty I met is I can¡¯t read the register of SJA1000.I want to know the possible cause and how to solve it.
- I want to know how to configure the ¡°Local Address Space (0~1) Bus Region Descriptor Register Description¡±, maybe there is some wrong with the timing between the PCI9052 and SJA1000.