10 Copyright 2010 Cirrus Logic (All Rights Reserved) DS636F2
EP9301
Entry Level ARM9 System-on-Chip Processor
Reset and Power Management
The chip may be reset through the PRSTn pin or through
the open drain common reset pin, RSTOn.
Clocks are managed on a peripheral-by-peripheral basis
and may be turned off to conserve power.
The processor clock is dynamically adjustable from 0 to
166 MHz.
Hardware Debug Interface
The JTAG interface allows use of ARM’s Multi-ICE or
other in-circuit emulators.
12-channel DMA Controller
The DMA module contains 12 separate DMA channels.
Ten of these may be used for peripheral-to-memory or
memory-to-peripheral access. Two of these are
dedicated to memory-to-memory transfers. Each DMA
channel is connected to the 16-bit DMA request bus.
The request bus is a collection of requests, Serial Audio
and UARTs. Each DMA channel can be used
independently or dedicated to any request signal. For
each DMA channel, source and destination addressing
can be independently programmed to increment,
decrement, or stay at the same value. All DMA
addresses are physical, not virtual addresses.
Internal Boot ROM
The Internal 16 kbyte ROM allows booting from FLASH
memory, SPI or UART. Consult the EP93xx User’s
Manual for operational details.
Table N. Reset and Power Management Pin Assignments
Pin Mnemonic Pin Name - Description
PRSTn Power On Reset
RSTOn
User Reset In/Out – Open Drain –
Preserves Real Time Clock value
Table O. Hardware Debug Interface
Pin Mnemonic Pin Name - Description
TCK JTAG Clock
TDI JTAG Data In
TDO JTAG Data Out
TMS JTAG Test Mode Select
TRSTn JTAG Port Reset
