SAM9G20 Atmel Corporation, SAM9G20 Datasheet - Page 135

• Manufacturer Part Number: SAM9G20
• Manufacturer: Atmel Corporation

Specifications of SAM9G20

• Flash (kbytes): 0 Kbytes
• Pin Count: 217
• Max. Operating Frequency: 400 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): 1
• Uart: 7
• 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): 95
• 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): 0.9 to 1.1
• Fpu: No
• Mpu / Mmu: No/Yes
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

5.5.6
ARM DDI0198D
Integrating RAM test logic
The memory used to implement TCM might require some form of test access, typically
by a BIST controller. Generally this is done by adding a collar of multiplexors around
the memory inputs. However, this method will add undesirable delays to the chip select
and address signals. This can be avoided by using the DMA interface to perform the
multiplexing of address and chip-select values. This is shown in Figure 5-19 on
page 5-28.
Copyright © 2001-2003 ARM Limited. All rights reserved.
DRDMAADDR[17:0]
Figure 5-18 TCM subsystem that uses the DMA interface
DRADDR[17:0]
ARM926EJ-S
DRWD[31:0]
DRWBL[3:0]
DRRD[31:0]
DRDMAEN
DRDMACS
DRWAIT
DRSEQ
DRnRW
DRCS
Tightly-Coupled Memory Interface
1
0
1
0
1
0
DMAADDR[31:0]
DRDMAEN
DMAWD[31:0]
DMAnRW
DMAWBL[3:0]
DMARD[31:0]
RD[31:0]
WBL[3:0]
nRW
WD[31:0]
A[17:0]
CS
DMA
SRAM
5-27