AT91RM9200-CI-002 Atmel, AT91RM9200-CI-002 Datasheet - Page 159

• 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 18-5. Memory Connection for a 16-bit Data Path Device
18.6.2
18.6.2.1
1768I–ATARM–09-Jul-09
Byte Write Access
Write Access
Write Access Type
Each chip select with a 16-bit data bus can operate with one of two different types of write
access:
This option is controlled by the BAT field in the SMC_CSR for the corresponding chip select.
See
Byte Write Access is used to connect 2 x 8-bit devices as a 16-bit memory page.
Figure 18-6
• Byte Write Access supports two byte write and a single read signal.
• Byte Select Access selects upper and/or lower byte with two byte select lines, and separate
• The signal A0/NLB is not used.
• The signal NWR1/NUB is used as NWR1 and enables upper byte writes.
• The signal NWR0/NWE is used as NWR0 and enables lower byte writes.
• The signal NRD enables half-word and byte reads.
read and write signals.
“SMC Chip Select Registers” on page
SMC
shows how to connect two 512K x 8-bit devices in parallel on NCS2 (BAT = 0)
D[15:8]
A[22:1]
D[7:0]
NCS2
NWE
NUB
NRD
NLB
190.
D[7:0]
D[15:8]
A[22:0]
Low Byte Enable
High Byte Enable
Write Enable
Output Enable
Memory Enable
AT91RM9200
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