AT91FR40162SB-CU-999 Atmel, AT91FR40162SB-CU-999 Datasheet - Page 31
AT91FR40162SB-CU-999
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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11.9
11.9.1
11.9.2
6410B–ATARM–12-Jan-10
Wait States
Standard Wait States
Data Float Wait State
The EBI can automatically insert wait states. The different types of wait states are listed below:
Each chip select can be programmed to insert one or more wait states during an access on the
corresponding device. This is done by setting the WSE field in the corresponding EBI_CSR. The
number of cycles to insert is programmed in the NWS field in the same register.
Below is the correspondence between the number of standard wait states programmed and the
number of cycles during which the NWE pulse is held low:
For each additional wait state programmed, an additional cycle is added.
Figure 11-13. One Wait State Access
Notes:
Some memory devices are slow to release the external bus. For such devices it is necessary to
add wait states (data float waits) after a read access before starting a write access or a read
access to a different external memory.
The Data Float Output Time (t
field of the EBI_CSR register for the corresponding chip select. The value (0 - 7 clock cycles)
indicates the number of data float waits to be inserted and represents the time allowed for the
data output to go high impedance after the memory is disabled.
• Standard wait states
• Data float wait states
• External wait states
• Chip select change wait states
• Early read wait states (see
0 wait states
1 wait state
1. Early Read Protocol
2. Standard Read Protocol
ADDR
NWE
MCK
NRD
NCS
Section 11.7 “Read Protocols” on page
1/2 cycle
1 cycle
DF
(1)
) for each external memory device is programmed in the TDF
1 Wait State Access
(2)
AT91FR40162SB
28)
31
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