參數(shù)資料
型號(hào): DS3160
元件分類: 通信及網(wǎng)絡(luò)
英文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
中文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
文件頁數(shù): 72/107頁
文件大?。?/td> 592K
代理商: DS3160
DS3160
72 of 107
The transmit HDLC has been designed to minimize its real-time host support requirements. The transmit
FIFO is 256 bytes. Once the host has loaded an outgoing packet, it can monitor the transmit packet-end
(TEND) status bit to know when the packet has finished being transmitted. The host also can be notified
when the FIFO has emptied below a programmable level called the low watermark. The host must never
overfill the FIFO. To keep this from occurring, the host can obtain the real-time depth of the transmit
FIFO by the transmit FIFO level bits in the HDLC status register (HSR).
The transmit remote-alarm indication (TRAI) function shares M-bits with the HDLC controller.
Transmission of RAI does not interrupt an outgoing HDLC frame in progress. Transmission of RAI can
only occur when the HDLC controller is in the idle state (sending flags or idles between transmit frames).
An HDLC packet can interrupt an RAI transmission. Transmission of the RAI resumes when the HDLC
packet is finished being sent.
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