IDT77105L25TF8 IDT, Integrated Device Technology Inc, IDT77105L25TF8 Datasheet - Page 14

• Manufacturer Part Number: IDT77105L25TF8
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT77105L25TF8

• Data Rate: 25.6Mbps
• Number Of Channels: 1
• Type Of Atm Phy Interface: UTOPIA
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Pin Count: 64
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

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.
writing to register 0x06.
Multi-Phy Operation
Multi-Phy Operation
Multi-Phy Operation
Multi-Phy Operation
PHY system architecture is needed.
IDT77105
The TxCell and RxCell counters are sized (16 bits) to provide a full
Reading Counters
1.
2.
Further reads may be accomplished in the same manner by first
Multiple 77105's may be connected to a common bus when a multi-
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.
value.
Decide which counter value is desired. Write to register 0x06 to
Read registers 0x04 (low byte) and 0x05 (high byte) to get the
Note: Only one counter (Selected bit in 0x06) may be
enabled at any time.
"Upstream"
"UTOPIA Transmit Bus"
"Upstream"
Hardware
Hardware
"UTOPIA Receive Bus"
-TxData[7:0]
-TxParity
-TxSOC
-RxData[7:0]
-RxParity
-RxSOC
RxCLAV #1
RxCLAV #2
RxCLAV #3
RxCLAV #4
TxCLAV #1
TxCLAV #2
TxCLAV #3
TxCLAV #4
RxEnb #1
RxEnb #2
RxEnb #3
RxEnb #4
TxEnb #1
TxEnb #2
TxEnb #3
TxEnb #4
10
10
Figure 12 Multi-PHY: Transmit Example
Figure 13 Multi-PHY Receive Example
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bus, can attach to common busses.
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.
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.
direction. A separate TxEnb and TxClav signal is provided to each
77105 for device select.
that each device has dedicated RxEnb and RxClav signals. (See Figure
13).
Both Transmit and Receive UTOPIA busses, as well as the utility
Device selection is controlled via the UTOPIA “enable” control
Note that while multiple transmit devices may be selected (e.g. for
Figure 12 is an example of connecting multiple PHYs in the transmit
Multi-Phy Receive is constructed in the same manner as transmit, in
77105#1
77105#3
77105#2
77105#4
77105#1
77105#3
77105#2
77105#4
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Magnetics
Magnetics
Magnetics
Magnetics
Magnetics
Magnetics
Magnetics
Magnetics
September 11, 2000
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3445 drw 15
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