SAM9G20 Atmel Corporation, SAM9G20 Datasheet - Page 128

• 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

Tightly-Coupled Memory Interface
5.5
5.5.1
5.5.2
5-20
TCM interface examples
Zero-wait-state RAM example
Producing byte writable memory using word writable RAM
This section contains the following examples:
•
•
•
Most of the examples in this section are for the DTCM interface. These are also
applicable to the ITCM interface.
The additional logic required for implementing the examples in this section is the
responsibility of the implementer.
Figure 5-12 shows the simplest RAM interface where the RAM block is constructed
from a single word-wide RAM that has byte write control. The TCM interface can
connect directly to the RAM block. This is a zero-wait-state memory so DRWAIT is
tied LOW.
If byte-write RAM is not available, four banks of byte-wide RAM must be used as
shown in Figure 5-13 on page 5-21.
Copyright © 2001-2003 ARM Limited. All rights reserved.
Zero-wait-state RAM example
Producing byte writable memory using word writable RAM
Multiple banks of RAM example on page 5-21.
Note
ARM926EJ-S
Figure 5-12 Zero wait state RAM example
DRADDR[17:0]
DRWD[31:0]
DRSIZE[3:0]
DRWBL[3:0]
DRRD[31:0]
DRWAIT
DRnRW
DRIDLE
DRSEQ
DRCS
[14:0]
b0110
CLK
CLK
A[14:0]
DIN[31:0]
nRW
BW[3:0]
CS
DOUT[31:0]
ARM DDI0198D
RAM 32KB