參數(shù)資料
型號: MC68HC05JB4DW
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 105/134頁
文件大?。?/td> 2440K
代理商: MC68HC05JB4DW
GENERAL RELEASE SPECIFICATION
February 24, 1999
UNIVERSAL SERIAL BUS MODULE
REV
10.2.1.4 Endpoint Field (ENDP)
The Endpoint eld is a four bit number that is used to select a particular endpoint
within a USB device. For the MC68HC05JB4, this will be a binary number
between zero and two inclusive. Any other value will cause the transaction to be
ignored.
10.2.1.5 Cyclic Redundancy Check (CRC)
Cyclic Redundancy Checks are used to verify the address and data stream of a
USB transaction. This eld is ve bits wide for token packets and sixteen bits wide
for data packets. CRCs are generated in the transmitter and sent on the USB data
lines after both the endpoint eld and the data eld. Figure 10-6 shows how the
ve bit CRC value is calculated from the data stream and veried for the address
and endpoint elds of a token packet. Figure 10-7 shows how the sixteen bit CRC
value is calculated and either transmitted or veried for the data packet of a given
transaction.
Figure 10-6. CRC Block Diagram for Address and Endpoint Fields
00 1 0 1
01 1 0 0
0
5
next bit
Data Stream
- Update every bit time.
- Reset to ones at SOP
Equal?
Good CRC
Bad CRC
5
Y
N
Expected Residual:
Generator Polynomial:
MUX
1
0
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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