Manual

154
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
21.5.8.5 Application Example
Figure 21-4 on page 154 illustrates an example of a CompactFlash application. CFCS0 and
CFRNW signals are not directly connected to the CompactFlash slot 0, but do control the
direction and the output enable of the buffers between the EBI and the CompactFlash Device.
The timing of the CFCS0 signal is identical to the NCS4 signal. Moreover, the CFRNW signal
remains valid throughout the transfer, as does the address bus. The CompactFlash _WAIT
signal is connected to the NWAIT input of the Static Memory Controller. For details on these
waveforms and timings, refer to the section “Static Memory Controller (SMC)”.
Figure 21-4. CompactFlash Application Example
Table 21-8. Shared CompactFlash Interface Multiplexing
Pins
Access to CompactFlash Device Access to Other EBI Devices
CompactFlash Signals EBI Signals
NRD/CFOE CFOE NRD
NWR0/NWE/CFWE CFWE NWR0/NWE
NWR1/NBS1/CFIOR CFIOR NWR1/NBS1
NWR3/NBS3/CFIOW CFIOW NWR3/NBS3
A25/CFRNW CFRNW A25
CompactFlash Connecto
r
EBI
D[15:0]
/OEDIR
CD1
CD2
/OE
D[15:0]
A25/CFRNW
NCS4/CFCS0
CD (PIO)
A[10:0]
A22/REG
NOE/CFOE
A[10:0]
REG
OE
WE
IORD
IOWR
CE1
CE2
NWE/CFWE
NWR1/CFIOR
NWR3/CFIOW
CFCE1
CFCE2
WAIT
NWAIT