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TNETA1585PCM Datasheet(PDF) 11 Page - Texas Instruments |
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TNETA1585PCM Datasheet(HTML) 11 Page - Texas Instruments |
11 / 32 page TNETA1585 ATM TRAFFIC MANAGEMENT SCHEDULER DEVICE WITH RECEIVE UTOPIA AND COPROCESSOR INTERFACES SDNS041A – NOVEMBER 1996 – REVISED JULY 1998 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 RM-cell-contents FIFO D When the TNETA1575 reads the next-cell register and an indication is given that an RM cell should be sent from the RM-cell contents FIFO D, the TNETA1575 must make 12 accesses to control-memory location 10004h to fetch one entire cell payload. The data that is returned by the TNETA1585 is in big-endian format as follows: Byte 0 (31–24) Byte 1 (23–16) Byte 2 (15–8) Byte 3 (7–0) The ordering and formatting of data (as it is sequentially read from this register) is: Word 0 – Bytes 0, 1, 2, 3 Word 1 – Bytes 0, 1, 2, 3 • • • coprocessor interface The coprocessor interface consists of a group of unidirectional serial channels through which real-time information concerning the transmission and reception of cells by the SAR/switch port is passed between the TNETA1585 and the SAR/switch port. Reset and interrupt capabilities also are provided by the coprocessor interface. The unidirectional serial-interface implementation by the TNETA1575 SAR is described below. Similar requirements apply when interfacing to a different SAR device or a switch port. The coprocessor interface consists of: Received cell-indication interface (RCCX) Transmitted cell-indication interface (TCCX) Data-availability interface (DAX) COP full-indication interface (COPFULL) received-cell-indication interface (RCCX) A serial-bit interface allows the TNETA1575 to signal to the TNETA1585 that a cell has been received on the UTOPIA interface on a particular channel. This interface is necessary to avoid duplicating the hardware that is used to resolve a virtual path identifier (VPI) or virtual channel identifier (VCI) to a channel number. When a cell is received, the VPI/VCI value from the header is extracted by the TNETA1575 and is used as a key in a lookup algorithm to resolve its associated channel number. When the lookup is complete, the TNETA1575 passes relevant information to the TNETA1585 by sending a 13-bit frame formatted as follows: Channel number (12–2) Good/bad cell indicator (1) Framing (0) Bits 12–2 (channel number). These bits indicate on which of the 2K channels the last cell was received. Bit 1 (good/bad cell indicator). This bit indicates whether or not the last cell passed the lookup test or if it should be discarded. The bit is encoded as follows: BIT 1 INDICATION 0 Cell is good (VPI/VCI was found in the lookup) 1 Cell should be discarded Bit 0 (framing). This bit is set to a 1 to denote the start of a frame. The frame is transmitted to the TNETA1585 through the RCCX terminal starting with bit 0. When a frame is not actively being transmitted, the RCCX terminal is driven to a 0. |
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