SAM9G45 Atmel Corporation, SAM9G45 Datasheet - Page 122

• Manufacturer Part Number: SAM9G45
• Manufacturer: Atmel Corporation

Specifications of SAM9G45

• Flash (kbytes): 0 Kbytes
• Pin Count: 324
• Max. Operating Frequency: 400 MHz
• Cpu: ARM926
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 160
• Ext Interrupts: 160
• Usb Transceiver: 3
• Usb Speed: Hi-Speed
• Usb Interface: Host, Device
• Spi: 2
• Twi (i2c): 2
• Uart: 5
• Lin: 4
• Ssc: 2
• Ethernet: 1
• Sd / Emmc: 2
• Graphic Lcd: Yes
• Video Decoder: No
• Camera Interface: Yes
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 440
• Resistive Touch Screen: Yes
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 64
• Self Program Memory: NO
• External Bus Interface: 2
• Dram Memory: DDR2/LPDDR, SDRAM/LPSDR
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 0.9 to 1.1
• Fpu: No
• Mpu / Mmu: No/Yes
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

Tightly-Coupled Memory Interface
5-14
In the WAIT state IRWAIT is asserted. In the COMPLETE state IRWAIT is
deasserted.
Certain types of memories can have different access penalties depending on whether an
access is sequential or nonsequential. The IRSEQ/DRSEQ signals indicate if an access
is sequential in the request cycle for an access, and are held HIGH during waited cycles.
This behaviour enables a loopback arrangement, where the SEQ output can be fed
directly back into the WAIT input through an inverter to produce a single cycle wait
state for nonsequential accesses as shown in Figure 5-8.
The cycle timing of the circuit shown in Figure 5-8 is shown in Figure 5-9 on page 5-15.
Copyright © 2001-2003 ARM Limited. All rights reserved.
Figure 5-8 Loopback of SEQ to produce a single cycle wait state
Figure 5-7 State machine for generating a single wait state
IRADDR[17:0]
IRRD[31:0]
IRWAIT
IRSEQ
IRCS
COMPLETE
IRCS = 0
WAIT
ARM DDI0198D
IRCS = 1
TCM