AT91SAM9G10-EK Atmel, AT91SAM9G10-EK Datasheet - Page 183

• Manufacturer Part Number: AT91SAM9G10-EK
• Description: KIT DEV FOR SAM9G10 ARM
• Manufacturer: Atmel
• Type: MCUr

Specifications of AT91SAM9G10-EK

• Contents: Board, Cables, Power Supply
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Kit Contents: Board
• Svhc: No SVHC (15-Dec-2010)
• Mcu Supported Families: AT91SAM9G10, ARM926EJ-S
• Tool / Board Applications: Microcontroller
• Rohs Compliant: Yes
• For Use With/related Products: *
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Figure 22-25. TDF Mode = 0: TDF wait states between read and write accesses on the same chip select
22.11 External Wait
22.11.1
6462A–ATARM–03-Jun-09
write2 controlling signal
read1 controlling signal
NBS0, NBS1,
NBS2, NBS3,
A0, A1
Restriction
D[31:0]
A[25:2]
(NWE)
(NRD)
MCK
Any access can be extended by an external device using the NWAIT input signal of the SMC.
The EXNW_MODE field of the SMC_MODE register on the corresponding chip select must be
set to either to “10” (frozen mode) or “11” (ready mode). When the EXNW_MODE is set to “00”
(disabled), the NWAIT signal is simply ignored on the corresponding chip select. The NWAIT
signal delays the read or write operation in regards to the read or write controlling signal,
depending on the read and write modes of the corresponding chip select.
When one of the EXNW_MODE is enabled, it is mandatory to program at least one hold
cycle for the read/write controlling signal. For that reason, the NWAIT signal cannot be
used in Page Mode
(“Slow Clock Mode” on page
The NWAIT signal is assumed to be a response of the external device to the read/write request
of the SMC. Then NWAIT is examined by the SMC only in the pulse state of the read or write
controlling signal. The assertion of the NWAIT signal outside the expected period has no impact
on SMC behavior.
TDF_CYCLES = 5
read1 cycle
read1 hold = 1
(“Asynchronous Page Mode” on page
Read to Write
Wait State
189).
TDF_CYCLES = 5
4 TDF WAIT STATES
192), or in Slow Clock Mode
AT91SAM9G10
write2 setup = 1
(optimization disabled)
TDF_MODE = 0
write2 cycle
183