SAM9XE256 Atmel Corporation, SAM9XE256 Datasheet - Page 133

• Manufacturer Part Number: SAM9XE256
• Manufacturer: Atmel Corporation

Specifications of SAM9XE256

• Flash (kbytes): 256 Kbytes
• Pin Count: 217
• Max. Operating Frequency: 180 MHz
• Cpu: ARM926
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 96
• Ext Interrupts: 96
• Usb Transceiver: 3
• Usb Speed: Full Speed
• Usb Interface: Host, Device
• Spi: 2
• Twi (i2c): 2
• Uart: 6
• Ssc: 1
• Ethernet: 1
• Sd / Emmc: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: Yes
• Adc Channels: 4
• Adc Resolution (bits): 10
• Adc Speed (ksps): 312
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 32
• Self Program Memory: NO
• External Bus Interface: 1
• Dram Memory: sdram
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 1.65 to 1.95
• Fpu: No
• Mpu / Mmu: No / Yes
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

ARM DDI0198D
The address and chip-select inputs to the ROM are pipelined with respect to the
ARM926EJ-S TCM interface outputs. An address incrementer is used to generate
sequential addresses. The output of the incrementer is captured at the end of every cycle
where the ROM CS chip select is active. The address source for the ROM is switched
over to the registered version of IRADDR when a nonsequential access occurs.
Figure 5-17 on page 5-26 shows the timing of the ROM address, chip-select, and read
data relative to the ARM926EJ-S TCM interface signals. The address supplied to the
ROM can either be behind, in sync with, or ahead of IRADDR, depending on the type
of memory access and the presence of idle cycles.
Figure 5-16 TCM subsystem that uses wait states for nonsequential accesses
Copyright © 2001-2003 ARM Limited. All rights reserved.
ARM926EJ-S
IRADDR[17:0]
IRRD[31:0]
IRWAIT
IRSEQ
IRCS
EN
1
0
+1
Tightly-Coupled Memory Interface
CS
A
RD
ROM
5-25