RM9200 Atmel Corporation, RM9200 Datasheet - Page 29

• Manufacturer Part Number: RM9200
• Manufacturer: Atmel Corporation

Specifications of RM9200

• Flash (kbytes): 0 Kbytes
• Pin Count: 256
• Max. Operating Frequency: 180 MHz
• Cpu: ARM920
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 122
• Ext Interrupts: 122
• Usb Transceiver: 3
• Usb Speed: Full Speed
• Usb Interface: Host, Device
• Spi: 1
• Twi (i2c): 1
• Uart: 5
• Ssc: 3
• Ethernet: 1
• Sd / Emmc: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 16
• 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: 3.3
• Fpu: No
• Mpu / Mmu: No / Yes
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

3.5
ARM DDI 0180A
Unidirectional/bidirectional mode interface
The ARM9TDMI supports connection to external memory systems using either a
bidirectional data data bus or two unidirectional buses. This is controlled by the UNIEN
input.
If UNIEN is LOW, DD[31:0] is a tristate output bus used to transfer write data. It is
only driven when the ARM9TDMI is performing a write to memory. By wiring
DD[31:0] to the input DDIN[31:0] bus (externally to the ARM9TDMI), a bidirectional
data data bus can be formed.
If UNIEN is HIGH, then DD[31:0], and all other ARM9TDMI outputs, are
permanently driven. DD[31:0] then forms a unidirectional write data data bus. In this
mode, the tristate enable pins IABE, DABE, DDBE, TBE, and the TAP instruction
nHIGHZ, have no effect. Therefore all outputs are always driven.
All timing diagrams in this manual, except where tristate timing is shown explicitly,
assume UNIEN is HIGH.
© Copyright ARM Limited 2000. All rights reserved.
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