AT91RM9200-QI-002 Atmel, AT91RM9200-QI-002 Datasheet - Page 166

• Manufacturer Part Number: AT91RM9200-QI-002
• Description: IC ARM9 MCU 208 PQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91RM9200-QI-002

• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 180MHz
• Connectivity: EBI/EMI, Ethernet, I²C, MMC, SPI, SSC, UART/USART, USB
• Peripherals: POR
• Number Of I /o: 122
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: ROM
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 208-MQFP, 208-PQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

Figure 18-16. Data Float Output Delay
18.6.4.4
166
AT91RM9200
Chip Select Change Wait State
on page
15) to be inserted and represents the time allowed for the data output to go to high impedance
after the memory is disabled.
Data float wait states do not delay internal memory accesses. Hence, a single access to an
external memory with long t
memory.
To ensure that the external memory system is not accessed while it is still busy, the SMC keeps
track of the programmed external data float time during internal accesses.
Internal memory accesses and consecutive read accesses to the same external memory do not
add data float wait states.
Notes:
A chip select wait state is automatically inserted when consecutive accesses are made to two
different external memories (if no other type of wait state has already been inserted). If a wait
state has already been inserted (e.g., data float wait state), then no more wait states are added.
D[15:0]
A[22:0]
1. Early Read Protocol
2. Standard Read Protocol
190). The value of TDF indicates the number of data float wait cycles (between 0 and
NCS
MCK
NRD
(1)
DF
will not slow down the execution of a program from internal
(2)
t
DF
1768I–ATARM–09-Jul-09