Freescale Semiconductor PowerQUICC MPC885 Reference Manual page 523

Chapter 16
PCMCIA Interface
The PCMCIA host adapter module provides all control logic for a PCMCIA socket interface, and requires
only additional external analog power switching logic and buffering. Additional external buffers allow the
PCMCIA host adapter module to support up to two PCMCIA sockets. The PCMCIA interface features the
following:
• Host adapter interface fully compliant with the PCMCIA standard, release 2.1 (16-bit PC Card).
• Up to two PCMCIA sockets, requiring only external buffering and analog switching logic
• Eight memory or I/O windows that can be assigned to either socket
16.1 System Configuration
In this system configuration, the sockets and system bus must be electrically isolated using external buffers
and bus transceivers. These buffers also provide voltage conversion required from the 3.3- to 5-V cards.
These components should be powered by the card power supply. Because the MPC885 can accept 5-V
inputs while generating 3.3-V outputs, conversion is not required for inputs.The PCMCIA host adapter
provides the control signals for demultiplexing the signals shared among the sockets.
a system configuration consisting of two PCMCIA sockets.
16.2 PCMCIA Module Signal Definitions
PCMCIA signals shared among all sockets consist of the address and data buses, socket control signals,
and synchronous socket status signals. A[6:31] and D[0:15] are the address and data signals of the system
bus. Figure 16-1 shows the PCMCIA host adapter module's external signals.
Freescale Semiconductor
MPC885 PowerQUICC Family Reference Manual, Rev. 2
Figure 16-1 shows
16-1