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CMX625 Datasheet(PDF) 8 Page - CML Microcircuits |
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CMX625 Datasheet(HTML) 8 Page - CML Microcircuits |
8 / 34 page ISDN TA POTS Interface CMX625 2001 Consumer Microcircuits Limited 8 D/625/2 1.5.2 Terminal Mode (TE) Terminal mode (TE) frame structure consists of 3 channels of 4 bytes each repeated at 8kHz, i.e. 96 bits in 125 µs or a data rate of 768kbps. The Data Clock (DCL) operates at twice the data rate, i.e. 1.536MHz. Figure 3 shows the TE mode frame structure. 125µs CHANNEL 0 CHANNEL 1 CHANNEL 2 B1 B2 MON0 C/I0 D M R M X CHANNEL 0 IC1 IC2 MON1 C/I1 M R M X CHANNEL 1 TIC CHANNEL 2 Not Used Not Used Not Used DU/DD FSC DCL M S B L S B FSC = 8kHz DCL = 1.536MHz DD, DU = 768kbps Figure 3 Terminal Mode Frame Structure ‘Channel 0’ is used for passing user data (2B+D channels) and controlling (MON0 and C/I0) the Layer 1 transceiver. Only ‘Channel 1’ is used by the CMX625. ‘Channel 2’ is reserved for D channel arbitration. The 12 byte frame contains the following channels: (i) The ‘B’ channels consist of two 64kbps data channels, labelled B1 and B2, and transfer B channel data to and from the network. (ii) The ‘Monitor’ channels consist of two programming channels, labelled MON0 and MON1. Each channel consists of 8 bits of data and has two associated pair of handshake bits that control data flow, MX and MR (monitor transmit and receive). The handshake procedure is described in section 1.5.4. The MON1 channel is used for programming and controlling devices attached to the IOM-2 interface. The CMX625 is programmed via the MON1 channel (see section 1.5.15). The MON0 channel is not used. Monitor channel contention is avoided by a “speak when spoken to” system whereby the CMX625 is given a unique address, programmed with the 3 Slot Address pins (SA0 to SA2) and 1 Device Select pin (DS) and only responds when that address is broadcast by the master device (see section 1.5.14). The Monitor channel address byte is shown below: Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 MON Channel Address Byte 1 Slot Address SA2 Slot Address SA1 Slot Address SA0 Device Select DS 0 0 0 |
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