TinyRISC
®
LR4102
Microprocessor
Datasheet
The TinyRISC LR4102 Microprocessor is a compact, high performance
32-bit microprocessor implemented in the LSI Logic G11™ technology.
The LR4102 is a complete microprocessor solution with caches, an
external bus interface with built-in memory controllers, and on-chip
debug. The LR4102 is built using the EZ4102 EasyMACRO subsystem,
available to customers through the LSI Logic CoreWare
®
program.
The LR4102 provides a 32-bit FBusMACRO to control all off-chip data
transactions (including DRAM or SDRAM) and an EJTAG interface for
on-chip debug with PC trace output.
Figure 1
illustrates the LR4102 chip.
Figure 1
LR4102
LR4102 Block Diagram
MMU
TLB RAM
Caches
Clock
Controller
32-bit TinyRISC
4102 CPU
and FastMDU
BIU and Cache
Controller (BBCC)
OCM
FBus-
MACRO
FBus
Two 32-bit Timers
SerialICE™-1 Port
EJTAG
SerialICE-1
Interface
EJTAG
Interface
EJTAG
Extended Debug MACRO
PC Trace
Output
The LR4102 microprocessor is powered by either 2.5 V (for 85 MHz
operation) or 1.8 V (for 50 MHz operation). The chip I/O ring requires
3.3 V. With a system clock of 85 MHz, peak performance is 85 MIPS and
sustained performance is estimated at 68 MIPS. With a 50 MHz clock,
performance is 50 MIPS peak and 40 MIPS sustained.
March 2000
Copyright © 1998–2000 by LSI Logic Corporation. All rights reserved.
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