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System Interface Unit
The PCMCIA host adapter module provides all control logic for a PCMCIA interface fully
compliant with the PCMCIA Standard, Release 2.1+ (PC Card -16). It can support one
PCMCIA socket with a maximum of eight memory or I/O windows.
Note: Both the MPC823e and MPC821 have the same PCMCIA module except that
the MPC823e has only one valid slot (Slot B). Programming a window to be
assigned to Slot A may cause an erroneous operation.
12.1 FEATURES
The following is a list of the system interface unit's main features:
• System Configuration and Protection
• System Interrupt Configuration
• System Reset Monitoring and Generation
• Clock Synthesizer
• Power Management
• Real-Time Clock
• PowerPC Decrementer
• Timebase
• Periodic Interrupt Timer
• External Bus Interface Control
• Eight Memory Banks Supported By the Memory Controller
• Debug Support
• PCMCIA Host Adapter Module Supports Eight Memory or I/O Windows
• IEEE 1149.1 Test Access Port
12.2 SYSTEM CONFIGURATION AND PROTECTION
The MPC823e incorporates many system functions that normally must be provided in
external circuits. It is designed to provide maximum system safeguards against hardware
and/or software faults. The following features are provided in the system configuration and
protection submodule:
• Interrupt Configuration —Allows you to configure the system according to your own
requirements. The functions include control of parity checking, show cycle operation,
and part and mask number constants.
• Bus Monitor —Monitors the TA response time for all bus accesses initiated by the
internal masters. A TEA signal is asserted if the TA response limit is exceeded. The bus
monitor measures time between TS and any termination of the bus cycle, including TA,
TEA, and RETRY.
12-2
MPC823e REFERENCE MANUAL
MOTOROLA
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