Freescale Semiconductor PowerQUICC MPC885 Reference Manual page 527

Signal
SPKR_x Speaker. input. When the card and socket are programmed for I/O interface operation, BVD2_x is
used as digital audio (SPKR_x) and is generated by I/O PC cards. SPKR_x must be used to provide
the socket's single amplitude (digital) audio wave form to the system. The SPKR_x signal of all
sockets are XORed and routed through the speaker out signal (SPKROUT).
RDY/ BSY_x, Ready/busy or interrupt request. Input. When the card and its socket are programmed for memory
IREQ_x interface operation, this signal is used as RDY/BSY_x and must be asserted by a PC card to indicate
that the PC card is busy processing a previous write command. When the card and its socket are
programmed for I/O interface operation, this signal is used as IREQ_x and must be asserted by a
PC card to indicate that a device on the PC card requires service by host software. Must be held
negated when no interrupt is requested. These signals are connected to IP_x7.
16.2.3 PCMCIA Output Port Signals (OP[0:4])
A PCMCIA slot can use the signals in
buffers to the card. The MPC885 gives software a way to control the output signal state. This function is
not necessarily specific to the PCMCIA interface; a system can use these signals as a general-purpose
output port.
Signal
RESET_x Card reset. Output. Provided to clear the card's configuration option register, thus placing the card
in its default (memory-only interface) state and beginning an additional card initialization. RESET_A
is connected to OP0 and RESET_B is connected to OP3.
POE_x PCMCIA buffers output enable. An output port line reflecting the value of PGCRx[CxOE]. Used to
three-state address and strobe lines addressing each slot. POE_A connects to OP1; POE_B
connects to OP2.
16.2.4 Other PCMCIA Signals
The PCMCIA socket uses the signals in
PCMCIA
Signal
IRQ Power is on. Input. The card power supply circuitry can use two of the IRQ signals as
general-purpose interrupt requests to notify the MPC885 when the card's power supply reaches the
full required voltage.
SPKROUT Speaker out. Output. Provides a digital audio wave form to be driven to the system's speaker. It is
generated as a logic exclusive OR of the SPKR_A and SPKR_B input signals.
Note: General purpose timer 1 can be used to drive SPKROUT. When enabled, timer 1 is exclusive
ORed with the resulting exclusive OR of the SPKR_A and SPKR_B input signals to generate
SPKROUT. See
Freescale Semiconductor
Table 16-2. PCMCIA Input Port Signals (continued)
Table 16-3 to control the RESET input and output enable of the
Table 16-3. PCMCIA Output Port Signals
Table 16-4, although their function is not necessarily specific to
Table 16-4. Other PCMCIA Signals
Section 17.2.2.6, "Timer 1 and SPKROUT."
MPC885 PowerQUICC Family Reference Manual, Rev. 2
Description
Description
Description
PCMCIA Interface
16-5