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| 型号： | MC68HC705JB2P |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDIP20 |
| 封装： | PLASTIC, DIP-20 |
| 文件页数： | 111/128页 |
| 文件大小： | 2493K |
| 代理商： | MC68HC705JB2P |
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August 28, 1998
GENERAL RELEASE SPECIFICATION
UNIVERSAL SERIAL BUS MODULE
REV 1.1
10-15
10.4.4 USB Control Logic
The USB control logic manages data movement between the CPU and the
transceiver. The control logic handles both transmit and receive operations on the
USB. It contains the logic used to manipulate the transceiver and the endpoint
registers. The logic contains byte count buffers for transmit operations that load
the active transmit endpoints byte count and use this to determine the number of
bytes to transfer. This same buffer is used for receive transactions to count the
number of bytes received and, upon the end of the transaction, transfer that
number to the receive endpoints byte count register.
When transmitting, the control logic handles parallel to serial conversion, CRC
generation, NRZI encoding, and bit stufng.
When Receiving, the control logic handles Sync detection, packet identication,
end of packet detection, bit (un)stufng, NRZI decoding, CRC validation, and
serial to parallel conversion. Errors detected by the control logic include bad CRC,
time-out while waiting for EOP, and bit stufng violations.
10.4.4.1 Data Encoding/Decoding
The USB employs NRZI data encoding when transmitting packets. In NRZI
encoding, a 1 is represented by no change in level and a 0 is represented by a
change in level. Figure 10-16 shows a data stream and the NRZI equivalent and
Figure 10-17 is a ow diagram for NRZI. The high level represents the J state on
the data lines in this and subsequent gures showing NRZI encoding. A string of
zeros causes the NRZI data to toggle each bit time. A string of ones causes long
periods with no transitions in the data.
10.4.4.2 Bit Stufng
In order to ensure adequate signal transitions, bit stufng is employed by the
transmitting device when sending a packet on the USB (see Figure 10-18 and
Figure 10-19). A 0 is inserted after every six consecutive 1’s in the data stream
before the data is NRZI encoded to force a transition in the NRZI data stream.
This gives the receiver logic a data transition at least once every seven bit times to
guarantee the data and clock lock. The receiver must decode the NRZI data,
recognize the stuffed bits, and discard them. Bit stufng is enabled beginning with
the Sync Pattern and throughout the entire transmission. The data “one” that ends
the Sync Pattern is counted as the rst one in a sequence. Bit stufng is always
enforced, without exception. If required by the bit stufng rules, a zero bit will be
inserted even if it is the last bit before the end-of-packet (EOP) signal.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC68HC705JB4DW | 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述: |
| MC68HC705JJ7CDW | 功能描述:IC MCU 8BIT 20-SOIC RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:HC05 其它有关文件:STM32F101T8 View All Specifications 特色产品:STM32 32-bit Cortex MCUs 标准包装:490 系列:STM32 F1 核心处理器:ARM? Cortex?-M3 芯体尺寸:32-位 速度:36MHz 连通性:I²C，IrDA，LIN，SPI，UART/USART 外围设备:DMA，PDR，POR，PVD，PWM，温度传感器，WDT 输入/输出数:26 程序存储器容量:64KB（64K x 8） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:10K x 8 电压 - 电源 (Vcc/Vdd):2 V ~ 3.6 V 数据转换器:A/D 10x12b 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:36-VFQFN，36-VFQFPN 包装:托盘 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名称:497-9032STM32F101T8U6-ND |
| MC68HC705JP7CDW | 功能描述:IC MCU 8BIT 28-SOIC RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:HC05 其它有关文件:STM32F101T8 View All Specifications 特色产品:STM32 32-bit Cortex MCUs 标准包装:490 系列:STM32 F1 核心处理器:ARM? Cortex?-M3 芯体尺寸:32-位 速度:36MHz 连通性:I²C，IrDA，LIN，SPI，UART/USART 外围设备:DMA，PDR，POR，PVD，PWM，温度传感器，WDT 输入/输出数:26 程序存储器容量:64KB（64K x 8） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:10K x 8 电压 - 电源 (Vcc/Vdd):2 V ~ 3.6 V 数据转换器:A/D 10x12b 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:36-VFQFN，36-VFQFPN 包装:托盘 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名称:497-9032STM32F101T8U6-ND |
| MC68HC705JP7CP | 制造商:Rochester Electronics LLC 功能描述: 制造商:Freescale Semiconductor 功能描述: |
| MC68HC705K1CDW | 制造商:Motorola Inc 功能描述: |
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