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ST5451 数据表(PDF) 8 Page - STMicroelectronics |
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ST5451 数据表(HTML) 8 Page - STMicroelectronics |
8 / 34 page EOM2 End of Message 2 (monitor channel) MON2 has received an end of mes- sage. XAB2 Monitor Transmit ABORT The received byte has not been de- tected in two successive frames. MON2 has sent an ABORT (A bit) to the remote transmitter. RMR2 Receive Monitor Register 2 ready A byte has been received in register MONR2. RAB2 Receive ABORT MON2 received an ABORT from the re- mote receiver. XMR2 Transmit Monitor Register 2 ready A byte can be stored in register MONX2. MASK0, MASK1, MASK2 After Reset FF; the three mask registers MASK0, MASK1, MASK2 are associated respectively to the three interrupt registers ISTA0, ISTA1,and ISTA2. Each interrupt source in ISTA registers can be se- lectively masked by setting to ”1” the correspond- ing bit in MASK1. Interrupt sources (masked or not) are indicated when ISTA is read by the mi- croprocessor. When an interrupt source is not masked, INT goes low. STAR Status Register After Reset 48H XDOV XFW IDLE RLA DCIO 0 0 0 XDOV Transmit Data Overflow More than 32 bytes have been written into the XFIFO. XFW XFIFO Write enable Data can be entered into the XFIFO. IDLE IDLE State 15 or more consecutive ones have been detected on the input data line. RLA Receive Line Active Frames or interframe flags are being received DCIO D and C/I Channels are occupied CMDR Command Register After Reset 00 XHF XME RMC RMD RHR XRES M2RES M1RES XHF HDLC frame transmission can start. XME Transmit Message End The last part of the frame was entered in XFIFO and can be sent. RMC Receive Message Complete Reaction to RPF or RME interrupt. The received frame (or one pool of data) has been read and the corresponding RFIFO is free. RMD Receive Message Delete Reaction to RPF or RME interrupt. The entire frame will be ignored. The part of frame already stored is deleted. RHR Reset HDLC receiver XRES Reset HDLC transmitter XFIFO is cleared and the transmitted frame (if any) is aborted. M2RES Monitor 2 Reset Reset MONITOR and C/I channels (TX and RX). M1RES Monitor 1 Reset Reset MONITOR and C/I channels (TX and RX). * For the four first bits (XHF, XME, RMC, RMD), the reset is done by the device; the other bits level sensitive MODE HDLC Mode Register After Reset 00 DMA FL1 FL0 ITF RAC CAC NHF FLA DMA DMA Interface activation FL1/0 Frame Length Minimum frame length accepted FL1 FL0 3 bytes 4 bytes 5 bytes 6 bytes 0 0 1 1 0 1 0 1 ITF InterframeTime Fill ITF= 1 : Flags are transmitted ITF= 0 : IDLE is transmitted RAC RAC= 1 : Activate RX RAC= 0 : deactivate RX ST5451 8/34 |
类似零件编号 - ST5451 |
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类似说明 - ST5451 |
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