EP9315 datasheet(6/64 Pages) CIRRUS

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DS638PP4

EP9315

Enhanced Universal Platform SOC Processor

Processor Core - ARM920T

The ARM920T is a Harvard architecture processor with

separate 16-kbyte instruction and data caches with an 8-

word line length but a unified memory. The processor

utilizes a five-stage pipeline consisting of fetch, decode,

execute, memory, and write stages. Key features include:

•

ARM (32-bit) and Thumb (16-bit compressed)

Instruction Sets

•

32-bit Advanced Micro-Controller Bus Architecture

(AMBA)

•

16-kbyte Instruction Cache with Lockdown

•

16-kbyte Data Cache (programmable write-through or

write-back) with Lockdown

•

MMU for Linux®, Microsoft® Windows® CE and Other

Operating Systems

•

Translation Look Aside Buffers with 64 Data and 64

Instruction Entries

•

Programmable Page Sizes of 1 Mbyte, 64 kbyte,

4 kbyte, and 1 kbyte

•

Independent Lockdown of TLB Entries

MaverickCrunch™ Math Engine

The

MaverickCrunch

Engine

mixed-mode

coprocessor designed primarily to accelerate the math

processing required to rapidly encode digital audio

formats. It accelerates single and double precision

integer and floating point operations plus an integer

multiply-accumulate

(MAC)

instruction

that

considerably faster than the ARM920T's native MAC

instruction. The ARM920T coprocessor interface is

utilized thereby sharing its memory interface and

instruction stream. Hardware forwarding and interlock

allows the ARM to handle looping and addressing while

MaverickCrunch handles computation. Features include:

•

IEEE-754 single and double precision floating point

•

32 / 64-bit integer

•

Add / multiply / compare

•

Integer MAC 32-bit input with 72-bit accumulate

•

Integer Shifts

•

Floating point to/from integer conversion

•

Sixteen 64-bit register files

•

Four 72-bit accumulators

MaverickKey™ Unique ID

MaverickKey unique hardware programmed IDs are a

solution to the growing concern over secure web content

and commerce. With Internet

security

playing an

important role in the delivery of digital media such as

books or music, traditional software methods are quickly

becoming unreliable. The MaverickKey unique IDs

provide OEMs with a method of utilizing specific

hardware IDs such as those assigned for SDMI (Secure

Digital Music Initiative) or any other authentication

mechanism.

Both a specific 32-bit ID as well as a 128-bit random ID is

programmed into the EP9315 through the use of laser

probing technology. These IDs can then be used to

match secure copyrighted content with the ID of the

target device the EP9315 is powering, and then deliver

the copyrighted information over a secure connection. In

addition, secure

transactions

can

benefit

also

matching device IDs to server IDs. MaverickKey IDs

provide a level of hardware security required for today’s

Internet appliances.

General Purpose Memory Interface (SDRAM,

SRAM, ROM, FLASH)

The EP9315 features a unified memory address model

where all memory devices are accessed over a common

address/data bus. A separate internal port is dedicated to

the read-only Raster/LCD refresh engine, while the rest

of the memory accesses are performed via the Processor

bus. The SRAM memory controller supports 8, 16 and

32-bit devices and accommodates an internal boot ROM

concurrently with 32-bit SDRAM memory.

•

1-4 banks of 32-bit 66 or 100 MHz SDRAM

•

One internal port dedicated to the Raster/LCD

Refresh Engine (Read Only)

•

Address and data bus shared between SDRAM,

SRAM, ROM, and FLASH memory

•

NOR FLASH memory supported

Table B. General Purpose Memory Interface Pin Assignments

Pin Mnemonic

Pin Description

SDCLK

SDRAM Clock

SDCLKEN

SDRAM Clock Enable

SDCSn[3:0]

SDRAM Chip Selects 3-0

RASn

SDRAM RAS

CASn

SDRAM CAS

SDWEn

SDRAM Write Enable

CSn[7:6] and CSn[3:0]

Chip Selects 7, 6, 3, 2, 1, 0

AD[25:0]

Address Bus 25-0

DA[31:0]

Data Bus 31-0

DQMn[3:0]

SDRAM Output Enables / Data Masks

WRn

SRAM Write Strobe

RDn

SRAM Read / OE Strobe

WAITn

SRAM Wait Input

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