SAM9G15 Atmel Corporation, SAM9G15 Datasheet - Page 124

• Manufacturer Part Number: SAM9G15
• Manufacturer: Atmel Corporation

Specifications of SAM9G15

• Flash (kbytes): 0 Kbytes
• Pin Count: 217
• Max. Operating Frequency: 400 MHz
• Cpu: ARM926
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 105
• Ext Interrupts: 105
• Usb Transceiver: 3
• Usb Speed: Hi-Speed
• Usb Interface: Host, Device
• Spi: 2
• Twi (i2c): 3
• Uart: 6
• Lin: 4
• Ssc: 1
• Sd / Emmc: 2
• Graphic Lcd: Yes
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 10
• Adc Speed (ksps): 440
• Resistive Touch Screen: Yes
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 32
• Self Program Memory: NO
• External Bus Interface: 1
• 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
5-16
The logic used to generate DRWAIT uses both the loopback scheme using DRSEQ for
inserting a wait state for a nonsequential request, and an additional signal DMAWAIT,
for stalling during DMA accesses. The FORCE_NSEQ signal is an override signal
used to force the ARM926EJ-S access to be treated as nonsequential because of an
intervening DMA access.
The A, WE and nRW inputs to the TCM are either sourced directly from the
ARM926EJ-S TCM interface, from the DMA controller, or from the capture register
(clocked by REQCLK) if the ARM926EJ-S access is postponed because of DMA
activity.
The cycle timing of the circuit shown in Figure 5-10 is shown in Figure 5-11 on
page 5-17.
Copyright © 2001-2003 ARM Limited. All rights reserved.
Figure 5-10 DMA with single wait state for nonsequential accesses
DRADDR[17:0]
DRWD[31:0]
DRWBL[3:0]
DRRD[31:0]
DRWAIT
DRnRW
DRSEQ
DRCS
REQCLK
DMA WD
WE, nRW)
DMA (A,
FORCE_NSEQ
DMAWAIT
ARM DDI0198D
SEQ
CS
A, WE,
nRW
WD
TCM
RD