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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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TNETV1002IDZHK bảng dữ liệu(PDF) 45 Page - Texas Instruments |
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TNETV1002IDZHK bảng dữ liệu(HTML) 45 Page - Texas Instruments |
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45 / 102 page  MCU Subsystem Functional Overview 35 June 2001 -- Revised December 2002 SPRS180C • Operation -- MCU software has to manage RX/TX events (by interrupt or polling) on MCU queues. Packets could be processed directly in EIM packet memory or could be transferred to general-purpose MCU memory to release descriptors as soon as possible. -- If multicast subscribing/unsubscribing is desired on MCU port, the MCU software has to compute a new value of the logical address hash filter and reprogram it on the ENET. • ENET DMA operations are limited to the 16 KB packet RAM. ENET cannot see the whole MCU memory space. Bits 31--16 of addresses are not significant. • ENET interrupts are grouped into one EIM interrupt. Interrupt status is accessible through the EIM status register. 4.3.2 MCU Universal Asynchronous Receiver/Transmitter (UART) Interfaces The UART modules perform serial-to-parallel conversion on data characters received and parallel-to-serial conversion on data characters transmitted by the processor. 4.3.2.1 UART Modes UART mode supports data transmission and data reception via two 64-word-deep FIFOs. Five different parity types are enabled, with three different stop bit formats. The word length is between 5 and 8, and line break can be generated and detected. The baud rate is generated from the MCU subsystem clock by a programmable divisor. All transmitting parameters can be detected in reception mode by an auto-bauding mechanism that recognizes speed, word size, parity, and the number of stop bits. Software flow control is available in the UART/IrDA when in UART mode. The UART/modem supports both software and hardware flow control when in UART mode. Hardware flow control can reduce the MCU software overhead required to process data interrupts. UART/Modem Mode The UART/modem provides an autobauding mechanism. All operations are controllable either via a software interface or using hardware flow control signals. The UART/Modem provides five external pin signals (multiplexed with GPIO pins): • GPIO09/TX_MODEM: Output - transmit data • GPIO10/RX_MODEM: Input - receive data • GPIO11/CTS_MODEM: Input - clear to send • GPIO12/RTS_MODEM: Output - request to send • GPIO13/DCD_MODEM: Output - data carrier detected The UART/modem features: • Line-break generation and detection • Interrupt system control • Loop-back capabilities for internal test • The autobauding supports speeds between 1200 and 115.2 Kbits/s. • Hardware flow control (DCD, RTS, CTS) |
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