Smbus; Device Bus; Table 5-2 Smbus Addressing; Table 5-3 Device Bus Devices, Access, Size And Default Address Range - GE C2K Hardware Reference Manual

5.1.2 SMBus

The C2K provides a System Management Bus (SMBus), a two-wire IIC interface that can com-
municate configuration or status information with other components following the I2C protocol.
The MV64460 System Controller provides the SMBus Host Controller to five slave ports. Table
5-2 lists the slave devices and their 7-bit addressing used by the devices.
SMBus addressing
Table 5-2
Device
MAX6658 Thermal Monitor
Board Configuration EEPROM
User Configuration EEPROM
C2K CPLD
RTC

5.1.3 Device Bus

The C2K provides an asynchronous 32-bit multiplexed Device Bus, mastered by the MV64460
System Controller with bus control and address decoding provided by the FPGA. Table 5-3 lists
the accessible devices and default address ranges set by the MV64460 following power-up or hard
reset. Addressing for these devices is according to MV64460 instructions for interfacing 8-bit,
16-bit, and 32-bit devices.
NOTE: MV64460 default values may be redefined in U-Boot boot loader utility.
Device bus devices, access, size and default address range
Table 5-3
Bank Device
Boot Flash ROM
3 Not used
2 FPGA USARTs
1 Not used
0 FPGA
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Address
0x4C
0x50
0x51
0x10
0x68
Access Size
32-bit 8MB
– –
8-bit 64kB
– –
16-bit 64kB
Default Address Range
0xFF80_0000 to 0xFFFF_FFFF
–
0xD811_0000 to 0xD811_FFFF
–
0xD810_0000 to 0xD810_FFFF
Resources
5-2