Pc Card Signals; Pc Card Interface Signals - Intel PXA27 Series Design Manual

6.5.6.1

PC Card Signals

See Table 6-13
Table 6-13. PC Card Interface Signals
Signal Name
nPCE<2:1>
nPREG
nPIOR
nPIOW
nPWE
nPOE
nIOIS16
nPWAIT
PSKTSEL
MA<25:0>
MD<15:0>
RDnWR
®
Intel PXA27x Processor Design Guide
for the list of signals required to interface to PC Card sockets.
Direction Polarity

PC Card Interface Signals

Output Active Low
Output NA
Output Active Low
Output Active Low
Output Active Low
Output Active Low
Input Active Low
Input Active Low
Output NA
Output NA
Bidirectional NA
Miscellaneous I/O Signals
Output Active High
System Memory Interface
Description
Byte lane enables for the card interface
nPCE1 enables byte MD<7:0>; nPCE2 enables byte
MD<15:8>
Serves as the card interface address bit 26 and selects
register space (I/O or attribute) versus memory space
Card interface I/O space output enable
Card interface I/O space write enable
Card interface attribute and common memory space write
enable
Also, write enable for variable latency I/O memory
Card interface attribute and common memory space output
enable
Card interface input from I/O space telling size of data bus
0 = 16-bit I/O space
1 = 8-bit I/O space
Card interface input for inserting wait states
0 – Wait
1 – Card is ready
In a single socket solution, this is the active low output
enable which is used as the nOE for the data transceivers
In a dual socket solution, the socket select
0 – Socket 0
1 – Socket 1
Output address to all memory types
Bidirectional data for all memory types
Data direction signal used by output transceivers
0 = MD<31:0> is driven by the PXA27x processor
1 = MD<31:0> is not driven by the PXA27x processor
II:6-25