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參數(shù)資料
| 型號(hào)： | MPC859TTS |
| 廠商： | Motorola, Inc. |
| 英文描述： | PowerQUICC⑩ Family Technical Summary |
| 中文描述： | ⑩家庭技術(shù)的PowerQUICC綜述 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 287K |
| 代理商： | MPC859TTS |
MOTOROLA
MPC859P/859T/859DSL PowerQUICC Family Technical Summary
For More Information On This Product,
Go to: www.freescale.com
7
System Interface Unit (SIU)
The IU uses 32, 32-bit GPRs for source and target operands. Typically, it can execute one integer instruction
each clock cycle. Each element in the integer block is clocked only when valid data is in the data queue and
is ready for operation. This holds power consumption of the device to the absolute minimum.
The core is integrated with MMUs as well as instruction and data caches. Each MMU provides a 32-entry,
fully associative instruction and data TLB, with multiple page sizes of 4, 16, 512, and 256 Kbytes and 8
Mbytes. It supports 16 virtual address spaces with 8 protection groups. Three special scratch registers
support software table search and update operations.
The instruction cache is four-way, set associative with physical addressing. It allows single-cycle access on
hits with no added latency for misses. It has four words per block, supporting a four-beat burst line fill using
an LRU (least recently used) replacement algorithm. The cache can be locked on a per cache block basis for
application-critical routines.
The data cache is two-way, set associative with physical addressing. It allows single-cycle accesses on hits
with one added clock latency for misses. It has four words per cache block, supporting burst line fill using
LRU replacement. The cache can be locked on a per block basis for application critical routines. The data
cache can be programmed through the MMU to support copy-back or write-through. Cache-inhibit mode
can be programmed per MMU page.
The debug interface provides debug capabilities without degrading operation speed. This interface supports
six watchpoint pins that are used to detect software events. Four of its eight internal comparators operate on
the effective address on the address bus, two operate on the effective address on the data address bus, and
two operate on the data bus. The core can make =,
≠
, <, and > comparisons to generate watchpoints. Each
watchpoint can then generate a break point that can be configured to trigger in a programmable number of
events.
1.3
System Interface Unit (SIU)
The SIU on the MPC859P/859T/859DSL Family integrates general-purpose features useful in almost any
32-bit processor system. Dynamic bus sizing allows 8-, 16-, and 32-bit peripherals and memory to exist in
the 32-bit system bus mode.
The SIU also provides power management functions, reset control, decrementer, and timebase.
The memory controller supports up to eight memory banks with glueless interfaces to DRAM, SRAM,
SSRAM, EPROM, Flash EPROM, SDRAM, EDO, and other peripherals with 2-clock-cycle access to
external SRAM and bursting support. It provides variable block sizes from 32 Kbytes to 256 Mbytes. The
memory controller provides 0–30 wait states for each memory bank and can use address type matching to
qualify each memory bank access. It provides four byte-enable signals, an output-enable signal. and a boot
chip select available at reset.
The DRAM interface supports port sizes of 8, 16, and 32 bits. Memory banks can be defined in depths of
256 or 512 Kbytes or 1, 2, 4, 8, 16, 32, or 64 Mbytes for all port sizes. The memory depth can be 64 and 128
Kbytes for 8-bit memory or 128 and 256 Mbytes for 32-bit memory. The DRAM controller supports
page-mode access for successive transfers within bursts. The MPC859P/859T/859DSL supports a glueless
interface to one bank of DRAM while external buffers are required for additional memory banks. The
refresh unit provides CAS before RAS, a programmable refresh timer, refresh active during external reset,
disable refresh mode, and stacking up to 7 refresh cycles. The DRAM interface uses a programmable state
machine to support almost any memory interface.
F
Freescale Semiconductor, Inc.
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