The MPC8541E integrates a PowerPC™ processor core built on Power Architecture™ technology with system logic required for networking, telecommunications, and wireless infrastructure applications. The MPC8541E is a member of the PowerQUICC™ III family of devices that combine system-level support for industry-standard interfaces with processors that implement the embedded category of the Power Architecture technology. For functional characteristics of the processor, refer to the MPC8555E PowerQUICC™ III Integrated Communications Processor Reference Manual.

Overview
The following section provides a high-level overview of the MPC8541E features. Figure 1 shows the major functional units within the MPC8541E.

KEY FEATUREs
The following lists an overview of the MPC8541E feature set.
• Embedded e500 Book E-compatible core
   — High-performance, 32-bit Book E-enhanced core that implements the PowerPC architecture
   — Dual-issue superscalar, 7-stage pipeline design
   — 32-Kbyte L1 instruction cache and 32-Kbyte L1 data cache with parity protection
   — Lockable L1 caches—entire cache or on a per-line basis
   — Separate locking for instructions and data
   — Single-precision floating-point operations
   — Memory management unit especially designed for embedded applications
   — Enhanced hardware and software debug support
   — Dynamic power management
   — Performance monitor facility
• Security Engine is optimized to handle all the algorithms associated with IPSec, SSL/TLS, SRTP, IEEE Std 802.11i™, iSCSI, and IKE processing. The Security Engine contains 4 Crypto-channels, a Controller, and a set of crypto Execution Units (EUs). The Execution Units are:
   — Public Key Execution Unit (PKEU) supporting the following:
      – RSA and Diffie-Hellman
      – Programmable field size up to 2048-bits
      – Elliptic curve cryptography
      – F2m and F(p) modes
      – Programmable field size up to 511-bits
   — Data Encryption Standard Execution Unit (DEU)
      – DES, 3DES
      – Two key (K1, K2) or Three Key (K1, K2, K3)
      – ECB and CBC modes for both DES and 3DES
   — Advanced Encryption Standard Unit (AESU)
      – Implements the Rinjdael symmetric key cipher
      – Key lengths of 128, 192, and 256 bits.Two key
      – ECB, CBC, CCM, and Counter modes
   — ARC Four execution unit (AFEU)
      – Implements a stream cipher compatible with the RC4 algorithm
      – 40- to 128-bit programmable key
   — Message Digest Execution Unit (MDEU)
      – SHA with 160-bit or 256-bit message digest
      – MD5 with 128-bit message digest
      – HMAC with either algorithm
   — Random Number Generator (RNG)
   — 4 Crypto-channels, each supporting multi-command descriptor chains
      – Static and/or dynamic assignment of crypto-execution units via an integrated controller
      – Buffer size of 256 Bytes for each execution unit, with flow control for large data sizes
• High-performance RISC CPM
   — Two full-duplex fast communications controllers (FCCs) that support the following protocol:
      – IEEE Std 802.3™/Fast Ethernet (10/100)
   — Serial peripheral interface (SPI) support for master or slave
   — I2C bus controller
   — General-purpose parallel ports—16 parallel I/O lines with interrupt capability
• 256 Kbytes of on-chip memory
   — Can act as a 256-Kbyte level-2 cache
   — Can act as a 256-Kbyte or two 128-Kbyte memory-mapped SRAM arrays
   — Can be partitioned into 128-Kbyte L2 cache plus 128-Kbyte SRAM
   — Full ECC support on 64-bit boundary in both cache and SRAM modes
   — SRAM operation supports relocation and is byte-accessible
   — Cache mode supports instruction caching, data caching, or both
   — External masters can force data to be allocated into the cache through programmed memory ranges or special transaction types (stashing).
   — Eight-way set-associative cache organization (1024 sets of 32-byte cache lines)
   — Supports locking the entire cache or selected lines
      – Individual line locks set and cleared through Book E instructions or by externally mastered transactions
   — Global locking and flash clearing done through writes to L2 configuration registers
   — Instruction and data locks can be flash cleared separately
   — Read and write buffering for internal bus accesses  (Continue....)