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SAB82525H-V21 Datasheet(PDF) 34 Page - Siemens Semiconductor Group |
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SAB82525H-V21 Datasheet(HTML) 34 Page - Siemens Semiconductor Group |
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34 / 126 page  SAB 82525 SAB 82526 SAF 82525 SAF 82526 Semiconductor Group 34 901.90 3.2 Half-Duplex SDLC-NRM Operation The LAP controllers of the two serial channels can be configured to function in a half-duplex Normal Response Mode (NRM), where they will operate as a slave (secondary) station, by setting the NRM bit in the XBCH register of the respective channel. In contrast to the full-duplex LAPB/LAPD operation, where the combined (primary + secondary) station transmits both commands and responses and may transmit data at any time, the NRM mode allows only responses to be transmitted and the secondary station may transmit only when instructed to do so by the master (primary) station. The HSCX gets the permission to transmit a frame from the primary by an S-, or I-frame with the poll bit (p) set! The NRM mode can be profitably used in a point-to-multipoint configuration with a fixed master-slave relationship and avoids collisions on the common transmit line. It’s the responsibility of the master station to poll the slaves periodically and to process the error recovery. Prerequisite for NRM operation is: MODE: MDS0, MDS1, ADM = 000 MODE: TDM = 0 XAD1 = XAD2 = RAL1 = RAL2 ← (address of secondary) Note: The broadcast address may be programmed in RAL2 if broadcasting is required. Reception of Frames The reception of frames functions equally to the LAPB/LAPD operation. Transmission of Frames The HSCX does not transmit S-, or I-frames if not instructed to do so by the primary station sending an S-, or I-frame with the poll bit set. The HSCX can be prepared to send an I-frame by the CPU issuing an XIF command (via CMDR) at any time. The transmission of the frame, however, will not be initiated by the HSCX prior to the reception of either a RR, or I-frame with a poll bit set (p = 1). After the frame has been transmitted (with the final bit set), the XFIFO is inhibited and the HSCX waits for the arrival of a positive acknowledgement. auto-mode with 8-bit address field selected external timer mode same transmit and receive addresses, since only responses can be transmitted, i.e. |
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