Overview
The MPC106 provides an integrated high-bandwidth, high-performance, TTL-compatible interface between a 60x processor, a secondary (L2) cache or additional (up to four total) 60x processors, the PCI bus, and main memory. This section provides a block diagram showing the major functional units of the 106 and describes briefly how those units interact.
Figure 1 shows the major functional units within the 106. Note that this is a conceptual block diagram intended to show the basic features rather than how these features are physically implemented on the device.

Features
This section summarizes the major features of the 106, as follows:
• 60x processor interface
   — Supports up to four 60x processors
   — Supports various operating frequencies and bus divider ratios
   — 32-bit address bus, 64-bit data bus
   — Supports full memory coherency
   — Supports optional 60x local bus slave
   — Decoupled address and data buses for pipelining of 60x accesses
   — Store gathering on 60x-to-PCI writes
• Secondary (L2) cache control
   — Configurable for write-through or write-back operation
   — Supports cache sizes of 256 Kbytes, 512 Kbytes, and 1 Mbyte
   — Up to 4 Gbytes of cacheable space
   — Direct-mapped
   — Supports byte parity
   — Supports partial update with external byte decode for write enables
   — Programmable interface timing
   — Supports pipelined burst, synchronous burst, or asynchronous SRAMs
   — Alternately supports an external L2 cache controller or integrated L2 cache module
• Memory interface
   — 1 Gbyte of RAM space, 16 Mbytes of ROM space
   — Supports parity or error checking and correction (ECC)
   — High-bandwidth, 64-bit data bus (72 bits including parity or ECC)
   — Supports fast page mode DRAMs, extended data out (EDO) DRAMs, and synchronous DRAMs (SDRAMs)
   — Supports 1 to 8 banks of DRAM/EDO/SDRAM with sizes ranging from 2 Mbyte to 128 Mbytes per bank
   — ROM space may be split between the PCI bus and the 60x/memory bus (8 Mbytes each)
   — Supports 8-bit asynchronous ROM or 64-bit burst-mode ROM
   — Supports writing to Flash ROM
   — Configurable external buffer control logic
   — Programmable interface timing
• PCI interface
   — Compliant with PCI Local Bus Specification, Revision 2.1
   — Supports PCI interlocked accesses to memory using LOCK signal and protocol
   — Supports accesses to all PCI address spaces
   — Selectable big- or little-endian operation
   — Store gathering on PCI writes to memory
   — Selectable memory prefetching of PCI read accesses
   — Only one external load presented by the MPC106 to the PCI bus
   — Interface operates at 20–33 MHz
   — Word parity supported
   — 3.3 V/5.0 V-compatible
• Support for concurrent transactions on 60x and PCI buses
• Power management
   — Fully-static 3.3-V CMOS design
   — Supports 60x nap, doze, and sleep power management modes and suspend mode
• IEEE 1149.1-compliant, JTAG boundary-scan interface
• 304-pin ceramic ball grid array (CBGA) package