Freescale Semiconductor PowerQUICC MPC885 Reference Manual page 529

16.3.3 Interrupts
The PCMCIA interface input pins register (PIPR) reports any changes on inputs from the PCMCIA card
to the host (BVD, CD, RDY, VS). The contents of the PCMCIA interface status changed register (PSCR)
are logically ANDed with the PCMCIA interface enable register (PER) to generate a PCMCIA interface
interrupt. The interrupt level is user programmable and the PCMCIA interface can generate an additional
interrupt for RDY/IRQ that can trigger on level (low or high) or edge (fall or rise) of the input signal.
16.3.4 Power Control
The user can perform a write cycle using one of the memory controller chip-select pins. This data includes
the controls to the analog switch such as the MAXIM MAX780. However, no auto-power control is
supported.
16.3.5 Reset and Three-State Control
The user can reset the PCMCIA cards or disable the output of the external latches by writing to
PGCRx[CxRESET] and PGCRx[CxOE], respectively.
16.3.6 DMA
The MPC885 DMA module with the CPM microcode provides two independent DMA (IDMA) channels.
See Section 19.3, "IDMA Emulation."
an I/O device implemented as a PCMCIA card to respond to DMA transfer. Any window can be
programmed as a DMA window through PORx[PRS]. When configured appropriately, the PCMCIA
controller supplies the required signals to the socket. Note that DMA to and from the PCMCIA interface
is handled through dual-access DMA transfers.
DMA requests can be supplied through SPKR_x, IOIS16_x, or INPACK. To support DMA, INPACK
should be connected to DREQ0 for slot A or to DREQ1 for slot B. The source for a DMA request is
programmed through PGCRx[CxDREQ]. If the internal DMA request is disabled, the DMA request is
assumed to be DREQ0/DREQ1 and port C should assign PC15/14 as DREQ0/DREQ1. If the request is
enabled, port C should not be programmed to be DREQ0/DREQ1.
Freescale Semiconductor
The PCMCIA module can be programmed to generate control for
MPC885 PowerQUICC Family Reference Manual, Rev. 2
PCMCIA Interface
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