9 16-bit pc card/compact flash interface, Section 6.9, “16-bit pc card/compact flash – Intel PXA26X User Manual
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Intel® PXA26x Processor Family Developer’s Manual
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Memory Controller
Figure 6-20. Asynchronous 32-Bit Flash Write Timing Diagram (2 Writes)
In
some of the parameters are defined as follows:
•
tAS = Address setup to nCS = 1 MEMCLK
•
tCES = nCS setup to nWE = 2 MEMCLKs
•
tASW = Address setup time to nWE asserted = 3 MEMCLKs
•
tDSWH = Write data, DQM setup to nWE deasserted = (RDF+2) MEMCLKs
•
tDH = Data, DQM hold after nWE deasserted = 1 MEMCLKs
•
tCEH = nCS held asserted after nWE deasserted = 1 MEMCLK
•
tAH = Address hold after nWE deasserted = 1 MEMCLKs
6.9
16-Bit PC Card/Compact Flash Interface
The following sections provide information on the card interface based on the PC Card Standard –
Volume 2 – Electrical Specification, Release 2.1, and CF+ and CompactFlash Specification
Revision 1.4. Only 8- and 16-bit data transfers are supported.
A0
A1
byte addr
byte addr
CMD
DATA
mask
mask
tDH
tDSWH
RDF+1
RD
RDF+1
tAH
tCEH
RD
tCES
tASW
tAS
RRR*2+1
RRR*2+1
MEMCLK
nCS[0]
MA[25:2]
MA[1:0]
nWE
nOE
RDnWR
MD[31:0]
DQM[3:0]
nADV(nSDCAS)