at91sam9g20-cu ATMEL Corporation, at91sam9g20-cu Datasheet - Page 145

• Manufacturer Part Number: at91sam9g20-cu
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

Table 20-9.
20.6.6.5
6384B–ATARM–15-Dec-08
Pins
NRD/CFOE
NWR0/NWE/CFWE
NWR1/NBS1/CFIOR
NWR3/NBS3/CFIOW
A25/CFRNW
Application Example
Shared CompactFlash Interface Multiplexing
Figure 20-5 on page 146
CFRNW signals are not directly connected to the CompactFlash slot 0, but do control the direc-
tion 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 sig-
nal 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)”.
Access to CompactFlash Device
CompactFlash Signals
CFOE
CFWE
CFIOR
CFIOW
CFRNW
illustrates an example of a CompactFlash application. CFCS0 and
AT91SAM9G20 Preliminary
Access to Other EBI Devices
EBI Signals
NRD
NWR0/NWE
NWR1/NBS1
NWR3/NBS3
A25
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