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PM7383 Datasheet(PDF) 52 Page - PMC-Sierra, Inc |
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PM7383 Datasheet(HTML) 52 Page - PMC-Sierra, Inc |
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52 / 231 page  RELEASED PM7383 FREEDM-32A256 DATASHEET PMC-2010336 ISSUE 1 FRAME ENGINE AND DATA LINK MANAGER 32A256 PROPRIETARY AND CONFIDENTIAL 44 8 FUNCTIONAL DESCRIPTION 8.1 High Speed Multi-Vendor Integration Protocol (H-MVIP) H-MVIP defines a synchronous, time division multiplexed (TDM) bus of Nx64 Kbps constant bit rate (CBR) data streams. Each 64 Kbps data stream (time- slot) carries an 8-bit byte of HDLC traffic, as described in the following section, and is characterised by 8 KHz framing. H-MVIP supports higher bandwidth applications on existing telephony networks by fitting more time-slots into a 125 ms frame. The FREEDM-32A256 supports H-MVIP data rates of 2.048 Mbps and 8.192 Mbps with 32 or 128 time-slots per frame and associated clocking frequencies of 4.096 and 16.384 MHz respectively. Figure 1 shows a diagram of the H-MVIP protocol supported by the FREEDM-32A256 device. Figure 1 – H-MVIP Protocol Data Clock (4, 16 MHz) Fram e Pulse (8 KHz) Serial Data B8 B1 B2 B8 TS 31/127 TS 0 TS 1 B1 TS 31/127 B2 B8 B7 125 us Fram e Pulse Clock (4 MHz) B7 8.2 High-Level Data Link Control (HDLC) Protocol Figure 2 shows a diagram of the synchronous HDLC protocol supported by the FREEDM-32A256 device. The incoming stream is examined for flag bytes (01111110 bit pattern) which delineate the opening and closing of the HDLC packet. The packet is bit de-stuffed which discards a "0" bit which directly follows five contiguous "1" bits. The resulting HDLC packet size must be a multiple of an octet (8 bits) and within the expected minimum and maximum packet length limits. The minimum packet length is that of a packet containing two information bytes (address and control) and FCS bytes. For packets with CRC-CCITT as |
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