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): 103/134頁
文件大小: 2440K
代理商: MC68HC05JB4DW
GENERAL RELEASE SPECIFICATION
February 24, 1999
UNIVERSAL SERIAL BUS MODULE
REV
Figure 10-3. Supported USB Packet Types
The following sections will give some detail on each segment used to form a
complete USB transaction.
10.2.1.1 Sync Pattern
The NRZI (See Section 10.4.4.1) bit pattern shown in Figure 10-4 is used as a
synchronization pattern and is prexed to each packet. This pattern is equivalent
to a data pattern of seven 0’s followed by a 1 (0x80).
Figure 10-4. Sync Pattern
The start of a packet (SOP) is signaled by the originating port by driving the D+
and D– lines from the idle state (also referred to as the “J” state) to the opposite
logic level (also referred to as the “K” state). This switch in levels represents the
rst bit of the Sync eld. Figure 10-5 shows the data signaling and voltage levels
for the start of packet and the sync pattern.
Token Packet:
IN
OUT
SYNC
PID
ADDR
ENDP
CRC5
EOP
SETUP
Data Packet:
DATA0
SYNC
PID
DATA
CRC5
EOP
DATA1
0 - 8 bytes
Handshake Packet:
ACK
NAK
SYNC
PID
EOP
STALL
SYNC PATTERN
PID0
PID1
Idle
NRZI Data
Encoding
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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