Motorola MPC823e Reference Manual page 975

CBDREQ2
Figure 17-2. Internal DMA Request Logic
17.5 PROGRAMMING THE PCMCIA INTERFACE
The following section describes the PCMCIA interface programming model. All registers are
memory-mapped within the internal control register area. The following registers are used
to control the PCMCIA interface.
17.5.1 PCMCIA Interface Input Pins Register
The PCMCIA interface input pins register (PIPR) is used to sample the PCMCIA input port
signals. When the PCMCIA controller is not operating, bits 16-23 of the PIPR can be used
to read from and write to the IP_B[0:7] pins as general-purpose I/O pins.
PIPR
BIT 0 1 2
FIELD
RESET
R/W
ADDR
BIT 16 17 18
FIELD
CBVS1 CBVS2 CBWP CBCD2
RESET
— — —
R/W
R/W R/W R/W
ADDR
NOTE: — = Undefined.
Bits 0–15—Reserved
These bits are reserved and must be set to 0.
MOTOROLA
IOIS16_B SPKR CBDREQ1
MULTIPLEXER
INTERNAL DMA REQUEST
3 4 5 6 7
RESERVED
—
R/W
(IMMR & 0xFFFF0000) + 0xF0
19 20 21 22 23
CBBVD CBBVD
CBCD1 CBRDY
2 1
— — — — —
R/W R/W R/W R/W R/W
(IMMR & 0xFFFF0000) + 0xF0
MPC823e REFERENCE MANUAL
PCMCIA Interface
DREQ2
PORT C
LOGIC
PORT C DREQ2
8 9 10 11 12
24 25 26 27 28
RESERVED
—
R/W
13 14 15
29 30 31
17-9