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Programming Details
2
MV64360 Endian Issues
2-18
4. The interrupting device is addressed from the MV64360 I2C
Bus.
5. The mapping of VMEbus interrupt sources and Tsi148
internal interrupt sources are programmable via the Interrupt
Map Registers 1 and 2 in the Tsi148 ASIC.
6. The DS1621 Digital Thermometer and Thermostat provides
9-bit temperature readings which indicate the temperature of
the device. The thermal alarm output, TOUT, is active when
the temperature of the device exceeds a user defined
temperature TH.
7. GPP[1,4,30,31] are unused. They are resistively pulled high
onboard.
The MV64360 supports only a big endian CPU bus. The endianess of the
local memory (DDR and SRAM) is also big endian. Data transferred
to/from the local memory is never swapped. The internal registers of the
MV64360 are always programed in little endian. On a CPU access to the
internal registers, data is byte swapped.
Data swapping on a CPU access to the PCI is controlled via PCI Swap bits
of each PCI Low Address register. This configurable setting allows a CPU
access to PCI agents with a different endianess convention.
Refer to the MV64360 Data Sheet, listed in
Documentation, for additional information and programming details.
Appendix A, Related
Computer Group Literature Center Web Site
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