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鍙冩暩(sh霉)璩囨枡
鍨嬭櫉(h脿o)锛� MCF5280CVM66
寤犲晢锛� Freescale Semiconductor
鏂囦欢闋�(y猫)鏁�(sh霉)锛� 10/766闋�(y猫)
鏂囦欢澶�?銆�?/td> 0K
鎻忚堪锛� IC MPU 32BIT COLDF 256-MAPBGA
妯�(bi膩o)婧�(zh菙n)鍖呰锛� 90
绯诲垪锛� MCF528x
鏍稿績铏曠悊鍣細 Coldfire V2
鑺珨灏哄锛� 32-浣�
閫熷害锛� 66MHz
閫i€氭€э細 CAN锛孍BI/EMI锛屼互澶恫(w菐ng)锛孖²C锛孲PI锛孶ART/USART
澶栧湇瑷�(sh猫)鍌欙細 DMA锛孡VD锛孭OR锛孭WM锛學DT
杓稿叆/杓稿嚭鏁�(sh霉)锛� 142
绋嬪簭瀛樺劜(ch菙)鍣ㄩ鍨嬶細 ROMless
RAM 瀹归噺锛� 64K x 8
闆诲 - 闆绘簮 (Vcc/Vdd)锛� 2.7 V ~ 3.6 V
鏁�(sh霉)鎿�(j霉)杞�(zhu菐n)鎻涘櫒锛� A/D 8x10b
鎸暕鍣ㄥ瀷锛� 澶栭儴
宸ヤ綔婧害锛� -40°C ~ 85°C
灏佽/澶栨锛� 256-LBGA
鍖呰锛� 鎵樼洡
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Cache
Freescale Semiconductor
4-9
4.3.5
Cache Miss Fetch Algorithm/Line Fills
As discussed in Section 4.1.2, 鈥淚ntroduction,鈥� the cache hardware includes a 16-byte, line-fill buffer for
providing temporary storage for the last fetched line.
With the cache enabled as defined by CACR[CENB], a cacheable fetch that misses in the tag memory and
the line-fill buffer generates an external fetch. For data misses, the size of the external fetch is always 16
bytes. For instruction misses, the size of the external fetch is determined by the value contained in the 2-bit
CLNF field of the CACR and the miss address. Table 4-6 shows the relationship between the CLNF bits,
the miss address, and the size of the external fetch.
Depending on the runtime characteristics of the application and the memory response speed, overall
performance may be increased by programming the CLNF bits to values 00 or 01.
For all cases of a line-sized fetch, the critical longword defined by bits [3:2] of the miss address is accessed
first followed by the remaining three longwords that are accessed by incrementing the longword address
in a modulo-16 fashion as shown below:
if miss address[3:2] = 00
fetch sequence = 0x0, 0x4, 0x8, 0xC
if miss address[3:2] = 01
fetch sequence = 0x4, 0x8, 0xC, 0x0
if miss address[3:2] = 10
fetch sequence = 0x8, 0xC, 0x0, 0x4
if miss address[3:2] = 11
fetch sequence = 0xC, 0x0, 0x4, 0x8
After an external fetch has been initiated and the data is loaded into the line-fill buffer, the cache maintains
a special most-recently-used indicator that tracks the contents of the associated line-fill buffer versus its
corresponding cache location. At the time of the miss, the hardware indicator is set, marking the line-fill
buffer as most recently used. If a subsequent access occurs to the cache location defined by bits [
10:4] (or
bits [
9:4] for split configurations of the fill buffer address), the data in the cache memory array is now most
recently used, so the hardware indicator is cleared. In all cases, the indicator defines whether the contents
of the line-fill buffer or the memory data array are most recently used. At the time of the next cache miss,
the contents of the line-fill buffer are written into the memory array if the entire line is present, and the
line-fill buffer data is most recently used compared to the memory array.
Generally, longword references are used for sequential instruction fetches. If the processor branches to an
odd word address, a word-sized instruction fetch is generated.
Table 4-6. Initial Fetch Offset vs. CLNF Bits
CLNF[1:0]
Longword Address Bits[3:2]
00
01
10
11
00
Line
Longword
01
Line
Longword
1X
Line
MCF5282 and MCF5216 ColdFire Microcontroller User鈥檚 Manual, Rev. 3
鐩搁棞(gu膩n)PDF璩囨枡
PDF鎻忚堪
VE-234-CU CONVERTER MOD DC/DC 48V 200W
VE-J6B-IX-S CONVERTER MOD DC/DC 95V 75W
MCF5280CVF66 IC MPU 32BIT 66MHZ 256-BGA
VE-J63-IX-S CONVERTER MOD DC/DC 24V 75W
VE-233-CU CONVERTER MOD DC/DC 24V 200W
鐩搁棞(gu膩n)浠g悊鍟�/鎶€琛�(sh霉)鍙冩暩(sh霉)
鍙冩暩(sh霉)鎻忚堪
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MCF5280CVM80 鍔熻兘鎻忚堪:32浣嶅井鎺у埗鍣� - MCU MCF5216 V2CORE NOFLASH RoHS:鍚� 鍒堕€犲晢:Texas Instruments 鏍稿績:C28x 铏曠悊鍣ㄧ郴鍒�:TMS320F28x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:32 bit 鏈€澶ф檪(sh铆)閻橀牷鐜�:90 MHz 绋嬪簭瀛樺劜(ch菙)鍣ㄥぇ灏�:64 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:26 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:2.97 V to 3.63 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:LQFP-80 瀹夎棰�(f膿ng)鏍�:SMD/SMT
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