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IDT77105 Datasheet(PDF) 14 Page - Integrated Device Technology |
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IDT77105 Datasheet(HTML) 14 Page - Integrated Device Technology |
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14 / 24 page  14 of 24 September 11, 2000 IDT77105 The TxCell and RxCell counters are sized (16 bits) to provide a full cell count (without roll over) if the counter is read once/second. The Symbol Error counter and HEC Error counter were given sufficient size to indicate exact counts for low error-rate conditions. If these counters overflow, a gross condition is occurring, where additional counter resolu- tion does not provide additional diagnostic benefit. Reading Counters 1. Decide which counter value is desired. Write to register 0x06 to the bit location corresponding to the desired counter. This loads the Counter Read registers with the selected counter’s value, and resets this counter to zero. Note: Only one counter (Selected bit in 0x06) may be enabled at any time. 2. Read registers 0x04 (low byte) and 0x05 (high byte) to get the value. Further reads may be accomplished in the same manner by first writing to register 0x06. Multi-Phy Operation Multi-Phy Operation Multi-Phy Operation Multi-Phy Operation Multiple 77105's may be connected to a common bus when a multi- PHY system architecture is needed. Both Transmit and Receive UTOPIA busses, as well as the utility bus, can attach to common busses. Device selection is controlled via the UTOPIA “enable” control signals: TxEnb and RxEnb. In transmit, TxEnb tells the selected device that the data and control signals it sees are to be used for ATM cell transmission. In receive, when RxEnb is deasserted (high), RxData[7:0], RxParity, and RxSOC are all tri-stated, allowing them to share a common bus. When RxEnb is asserted, the selected device drives these outputs, transferring the data to the upstream hardware. Note that while multiple transmit devices may be selected (e.g. for multicast) by asserting more than one TxEnb, multiple receive devices should not be enabled. Also, the output of RxRef is not affected by RxEnb; the same is also true for TxRef and TxEnb. These must be routed and/or multiplexed separately. Figure 12 is an example of connecting multiple PHYs in the transmit direction. A separate TxEnb and TxClav signal is provided to each 77105 for device select. Multi-Phy Receive is constructed in the same manner as transmit, in that each device has dedicated RxEnb and RxClav signals. (See Figure 13). Figure 12 Multi-PHY: Transmit Example Figure 13 Multi-PHY Receive Example "Upstream" Hardware 77105#1 Magnetics 77105#2 77105#3 77105#4 "UTOPIA Transmit Bus" -TxData[7:0] -TxParity -TxSOC TxEnb #1 TxEnb #2 TxEnb #3 TxEnb #4 3445 drw 15 Magnetics Magnetics Magnetics 2 2 2 2 2 2 2 2 10 10 10 10 10 TxCLAV #1 TxCLAV #2 TxCLAV #3 TxCLAV #4 "Upstream" Hardware 77105#1 Magnetics 77105#2 77105#3 77105#4 "UTOPIA Receive Bus" -RxData[7:0] -RxParity -RxSOC RxEnb #1 RxEnb #2 RxEnb #3 RxEnb #4 3445 drw 16 Magnetics Magnetics Magnetics 2 2 2 2 2 2 2 2 10 10 10 10 10 RxCLAV #1 RxCLAV #2 RxCLAV #3 RxCLAV #4 |
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