MIPS 74K

The MIPS32® 74K^TM family of cores from MIPS Technologies is based on the next-generation superscalar microarchitecture with out- of-order instruction dispatch. This new family is the industry's first fully synthesizable one to surpass 1 GHz using industry standard libraries and EDA flows. The innovative embedded microarchitecture also incorporates the MIPS® DSP Application Specific Extension (ASE) Rev2.

Processor derivatives enabled:

The MIPS 74K LinuxLink can also be used as a starting point for Linux development for designs based on the Release 2 of MIPS32® Instruction Set Architecture.

Reference boards/OEM boards enabled:

The MIPS 74K LinuxLink can be used as a starting point for Linux development for designs derived from:

• Malta board with MIPS32® 74K^TM core from MIPS Technologies

Notes:

Complete peripheral support for MIPS32® 74K^TM family derived integrated processors, or board support for other reference designs, might need to be sourced from manufacturers of the respective processors or reference boards.

Processor Features

Architecture

• Superscalar dual issue pipeline with Out-of-Order Instruction dispatch
• 17-stage pipeline
• 32-bit address paths and 64-bit data paths to external interface
• 128-bit data path for instruction cache and 64 or 128-bit data path for data cache
• 4 instruction fetch per cycle
• Combined Majority Branch Predictor using three 256 entry Branch History Tables (BHT)
• 8-entry return prediction stack
• CorExtend user defined instruction set extensions

DSP ASE Rev2

• 3 additional pairs of accumulator registers
• Fractional data types (Q15, Q31)
• 8 bit simultaneously 16 bit or 4 SIMD instructions operate on 2

FPU

• IEEE-754 compliant Floating Point Unit, compliant to MIPS 64-bit FPU standards
• Supports single- and double-precision data types
• Optionally runs at 1:1, 3:2 or 2:1 core/FPU clock ratio
• Separate in-order dual-issue pipeline decoupled from integer pipeline

MDU

• 32 multiply per clock Maximum issue rate of one 32
• 7-cycle multiply latency
• Iterative SRT divide algorithm. Minimum 10 and maximum 50 clock latency (dividend (rs) sign extension-dependent)

Bus interface Unit

• OCP version 2.1 interface with 32-bit address and 64-bit data
• OCP version 2.1 interface runs at core/bus clock ratios of 1, 1.5, 2, 2.5, 3, 3.5, 4, 5, or 10 via a separate synchronous bus clock
• Clock ratio can be changed dynamically
• Burst size of four, 64-bit beats
• 4-entry write buffer

Programmable

• 16/32/48/64 dual-entry, dual-ported TLB shared by Instruction and Data MMU
• 4-entry ITLB (4KB, 1MB page size)
• 4K, 16K, 64K, 256K, 1M, 4M, 16M, 64M, 256M byte page size supported in JTLB
• Optional simple Fixed Mapping Translation (FMT) mechanism

Programmable cache p>

• Instruction Cache sizes of 16/32/64 KB
• Data Cache sizes of 0/16/32/64 KB
• 4-way set associative
• 32-byte cache line size
• Writeback and write-through support in data cache
• Optional parity support
• Data Scratchpad RAM support
• Extensions for front-side L2 cache

EJTAG 3.2

• Support for single-stepping
• Instruction address and data address/value breakpoints
• TAP controller is chainable for multi-CPU debug
• Cross-CPU breakpoint support

Boards and Reference Distributions

LinuxLink software for the MIPS32® 74K^TM series has been validated on the Malta^TM reference board from MIPS. The Malta32® board is equipped with a processor daughter card providing support for the following features:

Reference Board Features
Ethernet Ports	One 100Mbit port
PCI	4 slots
Memory	64 Mbytes SDRAM
Flash	4 Mbytes boot flash
Modem port	Audio modem riser (AMR) connector
Serial port	Interface present
Parallel port	Interface present
USB port	Interface present
Compact Flash port	Interface present
Keyboard	Interface present
Mouse	Interface present
IDE	Interface present

Kernel and Device Support

Device	Linux Driver Configuration	Notes
Ethernet 0	CONFIG_PCNET_32=y
Serial 0	CONFIG_SERIAL_8250=y CONFIG_SERIAL_8250_CONSOLE=y CONFIG_SERIAL_NR_UARTS=4	16550
RTC	CONFIG_RTC=y

Toolchains

Available toolchains for development, including compilers and debuggers.

Feature	Details
Software Versions	GCC 4.2.0, BinUtils 2.17.50, Glibc 2.4, GDB 6.6.1, uclibc 0.9.29Pre
Cross-Development Toolchains	GNU Toolchains available for IA-32 Linux and Windows/Cygwin Hosts
C-Libraries	GNU C Library (glibc)
Native Development Support	GNU compiler toolchain, auto-tools, GNU Debugger and a full range of other development tools, including make, various common utilities, scripting languages, etc.
Package Building and Development	TimeSys Cross-Development tools (tsrpm, tsenv, etc.) support building of RPM packages using cross-compilation, installation of packages on host system to create root filesystems, and creation of IPKG packages.

Packages

Application Support is available as Linux packages for creating custom root filesystems, as well as for supporting cross-development.

Feature	Details
Common Linux Utilities	bash, bzip2, coreutils, diffutils, file, findutils, grep, gzip, less, lsof, man, procps, psmisc, schedutils, tar, tcsh, util-linux, zip
Network Clients and Servers	dhclient, ftp, rsync, simple-ftpd, tftp, telnet, telnet-server, udhcp, wget, wu-ftpd
Networking	arpwatch, ethtool, iproute, iputils, lksctp, netcat, net-snmp, net-tools, ntp, nfs-utils, openntpd, portmap, procmail, sendmail, tcpdump, wget
Web Servers	apache (httpd), boa
Security	beecrypt, cyrus-sasl, cracklib, distcache, dropbear, ipsec, kerberos, openca, openssl, openssh, pam, passwd, samhain, shadow-utils, stunnel, swatch, tcp_wrappers
Editors	nvi, zile, nano, jed, vim
Scripting Languages	awk, bash, perl, python, sed, tcl, tk
Development Libraries	expat, gmp, glib, glib2, libpcap, libnet, libcap, libtermcap, libxml2, libevent, libjpeg, pcre, readline
Development Tools	gcc, binutils, gdb, autoconf, automake, libtool, flex, bison, rcs, cvs, make, ltrace, strace, patch, diffstat, quilt
System Utilities	hotplug, mingetty, modutils, setup, syslog, syslog-ng, SysVInit, udev
Package Management	rpm, yum, ipkg
Hardware Interfacing	hwdata, kernel-utils, lmsensors, minicom, pciutils, setserial, usbutils
File Systems and Storage	e2fsprogs, mtd, scsirastools, lvm2, mdadm, raidtools
High Availability	heartbeat, OpenHPI, OpenIPMI

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