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BT8375EPF 参数 Datasheet PDF下载

BT8375EPF图片预览
型号: BT8375EPF
PDF下载: 下载PDF文件 查看货源
内容描述: 单芯片收发器T1 / E1和综合业务数字网( ISDN )基本速率接口 [single chip transceivers for T1/E1 and Integrated Service Digital Network (ISDN) primary rate interfaces]
分类和应用: 电信集成电路综合业务数字网
文件页数/大小: 323 页 / 1950 K
品牌: CONEXANT [ CONEXANT SYSTEMS, INC ]
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2.0 Circuit Description  
2.8 Transmitter  
Bt8370/8375/8376  
Fully Integrated T1/E1 Framer and Line Interface  
The Transmit Data Link FIFO #1 [TDL1; addr 0AD] is 64 bytes, and very  
versatile. It can be used as a single-byte transmit buffer or in any number of bytes,  
up to a maximum of 64. As a single-byte FIFO, the Transmit FIFO Empty Status  
(TMPTY1) in TDL #1 Status [TDL1_STAT; addr 0AE] and Transmit FIFO  
Empty Interrupt (TEMPTY) in Data Link 1 Interrupt Status (ISR2; addr 009] can  
be used for byte-by-byte transmissions.  
Using the Transmit Data FIFO, an entire block of data can be transmitted with  
very little microprocessor-interrupt overhead. Block transfers to the FIFO can be  
controlled by the Near Empty Threshold in the FIFO Empty Control register  
[TDL1_FEC; addr 0AB]. The Near Empty Threshold is a user-programmable  
value between 0 and 63 that represents the minimum number of bytes that can  
remain in the transmit FIFO before near empty is declared. Once the threshold is  
set, the Near Empty Status (TNEAR1) in TDL #1 Status [TDL1_STAT;  
addr 0AE] is asserted whenever the Near Empty Threshold is reached. An  
interrupt, TNEAR in the Data Link 1 Interrupt Status register [ISR2; addr 009], is  
also available to mark this event.  
Once an entire message is written into the transmit FIFO or circular buffer, the  
processor must indicate the end of message by writing any value to the TDL #1  
End of Message (EOM) Control [TDL1_EOM; addr 0AC]. In FCS mode, the  
EOM indicates that the FCS is to be calculated and transmitted following the last  
byte in the FIFO; in the Circular Buffer mode, the EOM indicates the end of the  
transmit circular buffer.  
2-56  
Conexant  
N8370DSE  
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