英语文档之关键词统计
1、操作目的
在阅读英语文档之前，一般需要有一定的英文基础。但是，在很多时候，我们不能知道自己的单词储备是否可以有效地完成阅读。这时，我们需要补充单词。自然而然地可以想到，我们应该补充高频单词用于提高阅读体验。高频，使用直接的统计方法就可以得到高频单词的分布，进而提升阅读体验。
2、操作方法
首先要找到软件，在百度上查了一下，replace pioneer可以实现该功能。其中的pattern counter支持在txt文件中查找单词并给出统计。当然，如果有实力的话也可以自己编程。在实际使用过程中查找一个几十M的文件需要几分钟。
自定义输入的正则表达式：[a-zA-Z]{4,14}
3、操作结果
以ug585为对象操作得到以下结论，取前面的数据：
Number 4_word([a-zA-Z]{4,14})
======= ====================================================
5438 Register
3433 Name
3343 Reset
3232 Type
3180 Description
3112 Value
3045 Address
2526 register
2419 data
2409 Details
2311 bits
2134 Zynq
1993 Reference
1954 Manual
1900 Technical
1891 xilinx
1885 Send
1870 Feedback
1863 September
1683 Bits
1658 reserved
1627 Field
1612 that
1600 read
1588 interrupt
1583 this
1513 This
1430 controller
1424 mode
1396 Access
1389 Width
1356 from
1287 clock
1275 Absolute
1275 Relative
1237 address
1200 when
1183 value
1148 Appendix
1061 write
1052 with
1018 Chapter
965 Controller
965 status
950 Control
949 memory
944 Interrupt
943 used
899 FIFO
893 reset
860 Reserved
850 only
832 Table
823 interface
820 control
748 Enable
748 Write
743 enable
723 device
712 secure
711 registers
700 Data
690 state
678 debug
666 must
658 Figure
612 Software
608 mixed
607 Read
597 When
593 field
588 Status
576 Clock
573 frame
568 channel
561 Output
559 system
556 same
542 using
531 Device
524 CTRL
509 port
505 zero
504 BootROM
504 section
500 DMAC
498 buffer
497 enabled
491 signal
482 dmac
479 frames
479 high
478 Level
476 boot
473 time
469 number
461 each
460 error
460 Configuration
459 into
457 access
447 slcr
441 software
439 signals
434 event
429 transfer
424 will
418 cache
417 counter
416 level
410 through
403 Interface
400 which
398 bytes
396 Input
392 then
387 input
387 EMIO
386 Select
386 power
381 output
379 slave
378 Mode
375 Note
373 configuration
371 master
370 Boot
359 instruction
357 transaction
352 Host
349 ignored
349 GPIO
349 mask
347 byte
345 burst
343 disabled
340 System
340 sraz
339 Counter
339 snsro
338 ddrc
337 written
336 always
334 targeted
330 received
328 Error
327 JTAG
325 XADC
324 Channel
319 UART
319 Quad
318 active
317 SDIO
315 Peripheral
314 other
313 DRAM
311 packet
307 both
307 after
305 Memory
304 host
301 reads
298 these
298 generated
296 more
296 Port
295 should
295 devices
295 disable
293 block
293 thread
290 also
290 code
289 source
289 operation
289 DATA
286 Indicates
286 pins
286 between
282 full
281 command
279 interrupts
279 writes
279 corresponding
278 These
278 information
268 length
266 Operates
263 peripheral
262 Trace
261 Each
260 following
259 trace
253 logic
253 size
252 Refer
252 User
249 request
249 type
247 High
247 timer
247 valid
247 Block
246 Transfer
242 Buffer
242 edge
242 before
241 Writes
240 page
239 shown
239 first
238 Power
238 Ethernet
237 values
236 modify
234 pause
233 Master
232 receive
231 Disable
231 enables
230 have
229 been
228 delay
228 message
228 than
227 bank
227 external
226 priority
225 NAND
225 Timer
225 transmit
224 interfaces
224 PERIPHID
223 example
223 transfers
222 single
222 Trigger
221 FSBL
220 down
219 Programmable
218 line
217 processor
217 Endpoint
216 four
215 TxFIFO
215 response
214 Slave
213 does
212 Signals
212 user
210 during
209 within
208 described
206 Target
206 Command
205 frequency
205 cycles
204 hardware
203 required
202 support
201 ports
201 refer
200 either
199 start
198 Secure
197 programmed
197 SRAM
196 endpoint
195 Event
194 word
194 complete
194 Cortex
194 indicates
193 until
193 there
191 There
191 interconnect
191 writing
189 PCAP
189 Debug
189 packets
188 available
187 clocks
184 RxFIFO
184 MASK
184 core
182 select
182 Bank
182 transactions
181 occurs
181 ctrl
181 cleared
180 Example
179 accesses
179 count
179 clear
177 whether
177 Clocks
176 rate
176 Interconnect
176 errors
176 match
175 Interrupts
175 ENABLE
171 ULPI
169 entry
169 MFIFO
168 XEMACPS
168 devcfg
167 Pointer
167 transmitted
167 Speed
166 latency
166 Mask
165 without
165 lower
165 contains
164 commands
164 undefined
163 based
163 security
162 default
162 Guide
161 setting
160 FPGA
158 supported
158 program
157 chip
157 trigger
156 provides
156 generate
155 width
155 executes
155 Transmit
154 Overview
154 lock
152 lockdown
151 Registers
149 being
149 table
148 Logic
148 maximum
147 configured
147 because
147 performance
146 execute
146 queue
145 Programming
145 destination
143 Clear
143 Diagram
142 sets
141 store
140 Base
140 Unit
140 programs
138 State
138 uart
138 receiver
136 stimulus
136 voltage
136 cycle
135 Cache
135 addr
135 abort
134 target
134 controlled
133 Full
132 flash
132 card
132 internal
132 might
131 DDRC
131 driven
130 empty
129 execution
128 EHCI
128 effect
128 StimPort
128 Flash
128 includes
127 Frame
127 beat
126 ICDIPTR
126 selected
126 Header
126 returns
126 Xilinx
126 descriptor
125 Start
125 LPDDR
125 module
125 list
124 CPUs
124 transmission
124 Test
124 fault
123 back
123 Pins
123 multiple
123 mpcore
123 connected
123 Packet
122 After
122 Transaction
121 config
121 last
120 sequence
120 detected
120 uses
120 Intrpt
120 next
120 current
119 CoreSight
119 asserted
118 Watchdog
118 controls
118 operating
117 speed
116 Match
116 case
116 three
115 PULLUP
115 rising
115 routed
115 programming
114 Acceptance
114 details
114 Enabled
113 provide
113 Config
112 COMPID
112 return
112 modes
111 automatically
111 DisableRcvr
110 shows
110 Configure
110 defined
110 Frames
110 OFFSET
109 where
109 different
109 range
109 supports
108 overflow
108 Priority
108 Signal
108 sent
108 change
107 flag
107 condition
106 except
106 Request
106 Gigabit
105 fields
105 associated
105 locked
105 while
104 include
104 causes
104 protocol
104 feature
103 buffers
103 training
103 instructions
102 generation
102 requests
102 Processing
102 process
102 tpiu
102 DDRIOB
102 Source
101 stored
101 image
101 operations
101 Standard
101 entries
101 indicate
100 Length
100 implemented
100 SLCR
100 provided
100 DMAST
100 QSPI
这里是出现次数超过一百次的单词。有时间就可以多记，没时间少记。这里面大部分单词是基础单词，一扫而过就行。感觉记住超过1000的即可基本阅读。