ATEVK1105 Atmel, ATEVK1105 Datasheet - Page 390

• Manufacturer Part Number: ATEVK1105
• Description: KIT EVAL FOR AT32UC3A0
• Manufacturer: Atmel
• Series: AVR®32r
• Type: MCUr

Specifications of ATEVK1105

• Contents: Evaluation Board, Software and Documentation
• Processor To Be Evaluated: AT32UC3A0512
• Processor Series: AVR
• Data Bus Width: 32 bit
• Interface Type: USART, TWI, USB, SPI, Ethernet
• Operating Supply Voltage: 3.3 V
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Core Sub-architecture: AVR UC3
• Silicon Core Number: AT32UC3A0512
• Silicon Family Name: AVR
• Kit Contents: Board CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: AT32UC3A0
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

27.6.6.2
Figure 27-23. TDF Optimization: No TDF wait states are inserted if the TDF period is over when the next access begins
27.6.6.3
32058J–AVR32–04/11
CLK_SMC
D[15:0]
A[25:2]
NCS0
NWE
NRD
TDF Optimization Enabled (TDF_MODE = 1)
TDF Optimization Disabled (TDF_MODE = 0)
Read access on NCS0 (NRD controlled)
When the TDF_MODE of the MODE register is set to 1 (TDF optimization is enabled), the SMC
takes advantage of the setup period of the next access to optimize the number of wait states
cycle to insert.
Figure 27-23
NWE, on Chip Select 0. Chip Select 0 has been programmed with:
NRD_HOLD = 4; READ_MODE = 1 (NRD controlled)
NWE_SETUP = 3; WRITE_MODE = 1 (NWE controlled)
TDF_CYCLES = 6; TDF_MODE = 1 (optimization enabled).
When optimization is disabled, tdf wait states are inserted at the end of the read transfer, so that
the data float period is ended when the second access begins. If the hold period of the read1
controlling signal overlaps the data float period, no additional tdf wait states will be inserted.
Figure
• read access followed by a read access on another chip select,
• read access followed by a write access on another chip select,
27-24,
shows a read access controlled by NRD, followed by a write access controlled by
NRD_HOLD = 4
Figure 27-25
TDF_CYCLES = 6
and
Figure 27-26
Read to Write
Wait State
NWE_SETUP = 3
illustrate the cases:
write access on NCS0 (NWE controlled)
AT32UC3A
390