AT91FR40162SB-CU-999 Atmel, AT91FR40162SB-CU-999 Datasheet - Page 30

• Manufacturer Part Number: AT91FR40162SB-CU-999
• Description: IC MCU 32BIT RISC 121BGA
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91FR40162SB-CU-999

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 75MHz
• Connectivity: EBI/EMI, UART/USART
• Peripherals: WDT
• Number Of I /o: 32
• Program Memory Size: 2MB (1M x 16)
• Program Memory Type: FLASH
• Ram Size: 256K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 121-BGA
• Data Bus Width: 32 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

Figure 11-11. Early Read Wait State
Write Cycle
Early Read Wait
Read Cycle
MCKI
ADDR
NCS
NRD
NWE
11.8
Write Data Hold Time
During write cycles in both protocols, output data becomes valid after the falling edge of the
NWE signal and remains valid after the rising edge of NWE, as illustrated in
Figure
11-12. The
external NWE waveform (on the NWE pin) is used to control the output data timing to guarantee
this operation.
It is therefore necessary to avoid excessive loading of the NWE pins, which could delay the write
signal too long and cause a contention with a subsequent read cycle in standard protocol.
Figure 11-12. Data Hold Time
MCK
ADDR
NWE
Data Output
In early read protocol the data can remain valid longer than in standard read protocol due to the
additional wait cycle which follows a write access.
AT91FR40162SB
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6410B–ATARM–12-Jan-10