Specifications
CDS Daughtercard Architecture
MPC8555E Configurable Development System Reference Manual, Rev. 1
4-16 Freescale Semiconductor
The CDC provides the I2C resources listed in Table 4-8.
4.13 Configuration
As with the CDS, CDCs include a large number of configuration options. Due to a variance in
configuration needs of processors/bridge logic, this section is dependent on the CDC processor.
Some options are designed to be easily changeable, and use the same I2C-overrideable switch
configuration logic used on the carrier (see Section 3.13, “Configuration”). Other infrequently used
options are implemented with optional resistor installation, requiring removal and/or installation of SMT
resistors.
Configuration options fall into two classes: persistent and dynamic. Persistent configuration values are
connected to dedicated pins which have no other function. These signals can be connected to resistors or
switches, but no other help is needed. Dynamic configuration values are determined by sampling a pin at
reset, after which time the pin reverts to some other function.
4.14 Power
Power for the processor core, as well as other logic on the daughtercard, comes from the +2.5- and +3.3-V
power supplies. A +12 V power supply is also available for fan-sink power and switching gate drive, but
not in sufficient amperage to derive any significant power from it. Table 4-9 summarizes the available
power to HIP cards.
Table 4-8. CDS Daughtercard I2C Bus Properties
I2C Device I2C Device I2C Address Data Size Notes
Remote control/configuration port PCA9555 0x18 (0011_000x)
0x19 (0011_001x)
0x1A (0011_010x)
0x1B (0011_011x)
8
System configuration EEPROM AT24C64A 0x50 (1010_000x) 8192 1
DDR SDRAM SPD EEPROM AT24LC02 0x51 (1010_001x) 256 2
CDC ID EEPROM AT24C64A 0x57 (1010_111x) 8192
Voltage monitor ADCs MAX1036 0xC8 (1100_100x) 16
Notes:
1. Only extended address I2C EEPROM devices are supported.
2. Device shown is just a compatible example; this device is actually on the DIMM memory module.
Table 4-9. CDC Available Power
Power Pins × Current Current Power
+2.5 V 41 × 0.45 A 18.5 A 46.2 W
+3.3 V 30 × 0.45 A 13.5 A 44.5 W
+5.0 V 16 × 0.45 A 7.2 A 36.0 W