ATSAM3U-EK Atmel, ATSAM3U-EK Datasheet - Page 371

• Manufacturer Part Number: ATSAM3U-EK
• Description: KIT EVAL FOR AT91SAM3U CORTEX
• Manufacturer: Atmel
• Type: MCUr

Specifications of ATSAM3U-EK

• Contents: Board
• Processor To Be Evaluated: SAM3U
• Data Bus Width: 32 bit
• Interface Type: RS-232, USB
• Operating Supply Voltage: 3 V
• Silicon Manufacturer: Atmel
• Core Architecture: ARM
• Core Sub-architecture: Cortex - M3
• Silicon Core Number: SAM3U4E
• Silicon Family Name: SAM3U
• Kit Contents: Board CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: AT91SAM3U
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

25.13.1
Figure 25-17. TDF Period in NRD Controlled Read Access (TDF = 2)
6430D–ATARM–25-Mar-11
6430D–ATARM–25-Mar-11
READ_MODE
NBS0, NBS1,
Setting READ_MODE to 1 indicates to the SMC that the NRD signal is responsible for turning off
the tri-state buffers of the external memory device. The Data Float Period then begins after the
rising edge of the NRD signal and lasts TDF_CYCLES MCK cycles.
When the read operation is controlled by the NCS signal (READ_MODE = 0), the TDF field gives
the number of MCK cycles during which the data bus remains busy after the rising edge of NCS.
Figure 25-17
assuming a data float period of 2 cycles (TDF_CYCLES = 2).
ation when controlled by NCS (READ_MODE = 0) and the TDF_CYCLES parameter equals 3.
D[15:0]
A[23:2]
A0, A1
MCK
NRD
NCS
illustrates the Data Float Period in NRD-controlled mode (READ_MODE =1),
NRD controlled read operation
tpacc
TDF = 2 clock cycles
Figure 25-18
SAM3U Series
SAM3U Series
shows the read oper-
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