ATEVK1105 Atmel, ATEVK1105 Datasheet - Page 382

• 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

Table 27-3.
27.6.4.7
27.6.5
32058J–AVR32–04/11
Coded Value
setup [5:0]
pulse [6:0]
cycle [8:0]
Automatic Wait States
Usage Restriction
Coding and Range of Timing Parameters
Number of Bits
The SETUP register groups the definition of all setup parameters:
• NRD_SETUP, NCS_RD_SETUP, NWE_SETUP, NCS_WR_SETUP
The PULSE register groups the definition of all pulse parameters:
• NRD_PULSE, ncs_rd_pULSE, nwe_pULSE, ncs_wr_pULSE
The CYCLE register groups the definition of all cycle parameters:
• NRD_CYCLE, NWE_CYCLEe
Table 27-3
The SMC does not check the validity of the user-programmed parameters. If the sum of
SETUP and PULSE parameters is larger than the corresponding CYCLE parameter, this
leads to unpredictable behavior of the SMC.
For read operations:
Null but positive setup and hold of address and NRD and/or NCS can not be guaranteed at the
memory interface because of the propagation delay of theses signals through external logic and
pads. If positive setup and hold values must be verified, then it is strictly recommended to pro-
gram non-null values so as to cover possible skews between address, NCS and NRD signals.
For write operations:
If a null hold value is programmed on NWE, the SMC can guarantee a positive hold of address,
byte select lines, and NCS signal after the rising edge of NWE. This is true for WRITE_MODE =
1 only. See
For read and write operations: a null value for pulse parameters is forbidden and may lead to
unpredictable behavior.
In read and write cycles, the setup and hold time parameters are defined in reference to the
address bus. For external devices that require setup and hold time between NCS and NRD sig-
nals (read), or between NCS and NWE signals (write), these setup and hold times must be
converted into setup and hold times in reference to the address bus.
Under certain circumstances, the SMC automatically inserts idle cycles between accesses to
avoid bus contention or operation conflict.
6
7
9
shows how the timing parameters are coded and their permitted range.
”Early Read Wait State” on page
256 x cycle[8:7] + cycle[6:0]
128 x setup[5] + setup[4:0]
256 x pulse[6] + pulse[5:0]
Effective Value
385.
Coded Value
0 ≤ ≤ 127
0 ≤ ≤ 31
0 ≤ ≤ 63
Permitted Range
AT32UC3A
256 ≤ ≤ 256+127
512 ≤ ≤ 512+127
768 ≤ ≤ 768+127
Effective Value
128 ≤ ≤ 128+31
256 ≤ ≤ 256+63
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