
Block Diagram
Real-Time Clock/NVRAM/Timer Function
The MVME240x employs an
❏A
❏A SNAPHAT battery housing a crystal along with the battery
The SNAPHAT battery package is mounted on top of the M48T559 device. The battery housing is keyed to prevent reverse insertion.
The clock furnishes seconds, minutes, hours, day, date, month, and year in BCD
3 |
PCI Host Bridge (PHB)
The PHB portion of the Hawk ASIC provides the bridge function between the MPC60x bus and the PCI Local Bus. It provides 32 bit addressing and 64 bit data. The 64 bit addressing (dual address cycle) is not supported. The Hawk supports various PowerPC processor external bus frequencies up to 100MHz and PCI frequencies up to 33MHz.
There are four programmable map decoders for each direction to provide flexible address mappings between the MPC and the PCI Local Bus. Refer to the
http://www.mcg.mot.com/literature |