Gemini; Introduction; Functional Description - Panasonic EB-GD30 Technical Manual

7

GEMINI

7.1 Introduction

Gemini contains the DSP, CPU and GSM timing functions and many peripheral functions. The software for the DSP is
contained in masked ROM.

7.2 Functional Description

7.2.1 Digital Signal Processor
The Digital Signal Processor (DSP) core is compatible with the Texas Instruments TMS350C5xx family of DSPs. Included in
the DSP core is an interface to the CPU by a shared memory interface.
The DSP memory is also located within GEMINI. The ROM code size is determined by the size of the software.
7.2.2 CPU
The CPU is an ARM7 32 bit RISC micro-controller core. It can work in 32 or 16-bit instruction modes and on 32, 16 or 8-bit
data. Pipelining is employed so that all parts of the processing and memory system can operate continuously.
CPU clock speed is selectable and is set to achieve optimum speed for memory access.
Clock Speed
19.5 MHz
13 MHz
9.75 MHz
6.5 MHz
4.875 MHz
3.75 MHz
For 120 ns access FLASH and RAM a 13 MHz clock gives 1 wait state access to both devices.
MCUK991001G8
Technical Guide
BASEBAND
INTERFACE
GSM
TDMA
TIMER
DSP
TPU
CORE
SIM
I/F
Figure 7.1: GEMINI Block Diagram
Memory Access Times
Memory Access Time
41 ns
67 ns
91 ns
144 ns
194 ns
298 ns
SPEECH
INTERFACE
ARM
MEM
I/F
Additional Access time per wait state
51 ns
77 ns
102 ns
154 ns
204 ns
308 ns
Section 7
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GEMINI
PWM
I/O
10087-1
Issue 1
Revision 0