mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 964

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

17.3 PCMCIA SIGNALS
The PCMCIA module consists of the cycle control, input port, output port, and various other
signals.
17.3.1 The PCMCIA Cycle Control Signals
The following signals are used for I/O accesses to the PCMCIA card:
• Address Bus (A[6:31])—Output. These signals must be buffered to generate the
• Attribute Memory Select (REG)—Output. When this signal is asserted during a
• Card Enables (CE1_B, CE2_B)—Output. When a PCMCIA access is performed, the
socket’s A25 through A0 signals, which are address bus output lines that allow direct
addressing of up to 64M of memory on the PCMCIA card. Signal A6 is the
most-significant bit and A31 is the least-significant bit.
PCMCIA access, card access is limited to attribute memory when a memory access
occurs (WE or OE are asserted), and to I/O ports when an I/O access occurs (IORD or
IOWR are asserted). On accesses with REG asserted, accesses to common memory
or DMA devices are blocked. When no PCMCIA access is performed, this signal is
TSIZ0.
CE1 and CE2 signals are card enable output signals. The CE1 signal enables even
bytes and CE2 enables odd bytes.
The CEx signals can be configured to duplicate the values of the A[22:23] signals. At
the end of the PCMCIA access, these lines will be always negated. See Table 17-1 for
details. This feature can be used to access devices supporting IDE/ATA protocols.
PRS
PRS = ‘110’
FIELD
PRS
‘110’
Table 17-1. Card Enable as Driven by the MPC823
A22
X
0
0
1
1
Freescale Semiconductor, Inc.
A23
For More Information On This Product,
X
0
1
0
1
MPC823 REFERENCE MANUAL
Go to: www.freescale.com
16 bits
PORT
8 bits
SIZE
X
X
X
X
16 bit (only even)
16 bit (only even)
8 bits even
8 bits even
No access
ACCESS
8 bit odd
8 bit odd
SIZE
X
X
X
X
MPC823: A31
(SLOT: A0)
X
X
X
X
X
0
1
0
0
1
0
PCMCIA Interface
CE2
1
1
1
0
0
1
1
0
0
1
1
CE1
0
0
0
0
1
0
1
0
1
0
1
17-3