AT91RM9200-CI-002 Atmel, AT91RM9200-CI-002 Datasheet - Page 160

• Manufacturer Part Number: AT91RM9200-CI-002
• Description: IC ARM9 MCU 256 BGA
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91RM9200-CI-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: 256-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

Figure 18-6. Memory Connection for 2 x 8-bit Data Path Devices
18.6.2.2
Figure 18-7. Connection to a 16-bit Data Path Device with Byte and Half-word Access
160
AT91RM9200
Byte Select Access
Byte Select Access is used to connect 16-bit devices in a memory page.
Figure 18-7
device type) on NCS2 (BAT = 1).
Figure 18-8
on NCS2 (BAT = 1).
• The signal A0/NLB is used as NLB and enables the lower byte for both read and write
• The signal NWR1/NUB is used as NUB and enables the upper byte for both read and write
• The signal NWR0/NWE is used as NWE and enables writing for byte or half-word.
• The signal NRD enables reading for byte or half-word.
operations.
operations.
SMC
SMC
shows how to connect a 16-bit device without byte access (e.g., Flash device type)
shows how to connect a 16-bit device with byte and half-word access (e.g., SRAM
D[15:8]
A[22:1]
D[15:8]
A[19:1]
NWR1
NWR0
D[7:0]
NCS2
D[7:0]
NCS2
NWE
NRD
NUB
NRD
NLB
A0
D[15:8]
D[7:0]
A[18:0]
Write Enable
Read Enable
Memory Enable
A[18:0]
Write Enable
Read Enable
Memory Enable
D[15:8]
A[18:0]
D[7:0]
Low Byte Enable
High Byte Enable
Write Enable
Output Enable
Memory Enable
1768I–ATARM–09-Jul-09