DP83850CVF National Semiconductor, DP83850CVF Datasheet - Page 7

• Manufacturer Part Number: DP83850CVF
• Description: IC CONTROLLER INTERFACE 132-PQFP
• Manufacturer: National Semiconductor

Specifications of DP83850CVF

• Controller Type: Ethernet Repeater Interface Controller
• Interface: Serial
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 295mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 132-MQFP, 132-PQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *DP83850CVF

2.0 Pin Descriptions
2.2 Inter Repeater and Management Bus Interface
IRD[3:0]
/IRD_ER
/IRD_V
IRD_CK
IRD_ODIR
/IR_ACTIVE
/IR_COL_IN
/IR_COL_OUT O/OC, M
IR_VECT[4:0] I/O/OC, M
MD[3:0]
/M_DV
M_CK
/M_ER
Signal Name
I/O/OC, M
I/O/Z, M
I/O/Z, M
I/O/Z, M
I/O/Z, M
I/O/Z, M
I/O/Z, M
I/O/Z, M
I/O/Z, M
Type
O, L
I
Active
high
high
high
(Continued)
low
low
low
low
low
low
low
—
—
—
Inter Repeater Data: Nibble data input/output. Transfers data from the “active”
DP83850C to all other “inactive” DP83850Cs. The bus master of the IRD bus is de-
termined by IR_VECT bus arbitration.
Note: Input buffer has a weak pull-up.
Inter Repeater Data Error: This signal carries the RX_ER state across the Inter Re-
peater bus. Used to track receive errors from the physical layer in real-time
Inter Repeater Data Valid: This signal carries the inverted RX_DV state across the
Inter Repeater bus. It is used to frame good packets.
Note: A recommended 1.5K pull-up prevents first repeated packet corruption .
Inter Repeater Data Clock: All Inter Repeater signals are synchronized to the rising
edge of this clock.
Note: Input buffer has a weak pull-up.
Inter Repeater Data Outward Direction: This pin indicates the direction of data for
an external transceiver. It is HIGH when IRD[3:0], /IRD_V, /IRD_CK, and /IRD_ER
are driven out towards the Inter Repeater bus, and LOW when data is being received
from the bus.
Inter Repeater Activity: This “open-collector” type output is asserted when the re-
peater senses network activity.
Note: Input buffer has a weak pull-up.
Inter Repeater Collision In: Indication from another DP83850C that it senses two or
more ports receiving or another DP83850C has detected a collision.
Note: Input buffer has a weak pull-up.
Inter Repeater Collision Out: Asserted when the DP83850C senses two or more
ports receiving or non-idle, either 1) within this DP83850C or 2) in another
DP83850C, using the IR_VECT number to decide (the IR_VECT number read will dif-
fer from the number of this DP83850C if another device is active).
Inter Repeater Vector: When the repeater senses at least one of its ports active, it
drives its unique vector (from RID[4:0]) onto these pins. If the vector value read back
differs from its own (because another vector is being asserted by another device),
then this DP83850C will:
1) not drive IRD_ODIR signal and,
2) the IRD[3:0], /IRD_ER, /IRD_V, and IRD_CK signals will be placed in TRI-STATE
mode.
However, if the value read back is the same as its own RID number, this DP83850C
will continue to drive the Inter Repeater bus signals. Note that these vectors are driv-
en onto the bus for the duration of /ACTIVEO assertion.
Note: Input buffer has a weak pull-up.
Management Data: Outputs management information for the DP83856 manage-
ment chip. During packet reception the DP83850C drives its RID number and the port
number of the receiving port onto this bus.
Note: Input buffer has a weak pull-up.
Management Data Valid: Asserted when valid data is present on MD[3:0].
Note: Input buffer has a weak pull-up.
Management Clock: All data transfers on the management bus are synchronize to
the rising edge of this clock.
Note: Input buffer has a weak pull-up.
Management Error: Asserted when an Elasticity Buffer overrun or under-run error
has been detected.
Note: Input buffer has a weak pull-up.
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Description
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