DP83850C datasheet(25/37 Pages) NSC

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5.0 DP83850C Applications (Continued)

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5.4 DP83856 100RIB Connections

To achieve a practical managed 100Mb/s repeater design

that keeps up with the fast ﬂow of network information, a

hardware statistics gathering engine is required. The

DP83856

100Mb/s Repeater Information Base device

(100RIB) is speciﬁcally designed to work with the

DP83850C to provide such a design. In a multi-100RIC

system, one of the 100RIC devices has to be chosen to

source the transmit data bus to the 100RIB. This 100RIC is

known as the "Local 100RIC" since is likely to be the near-

est one (physically) to the 100RIB on the circuit board. All

the other signals that the 100RIB requires in order to keep

statistics are common to all the other 100RICs. Figure 10

shows a typical connection between the 100RIC and the

100RIB. Note that, depending on board layout, track

lengths and loading, buffers (not shown) may be required

on some signals.

Figure 10. Typical DP83850C to DP83856 Connections

TXD3

TXD2

TXD1

TXD0

TX_ER

TX_RDY

MD3

MD2

MD1

MD0

/M_DV

M_CK

/M_ER

TX Bus to the Local 100RIC's PHYs

74ABT16245C

DP83858C

Local

100RIC

DP83856

100RIB

TXD3

TXD2

TXD1

TXD0

TX_ER

TX_RDY

MD3

MD2

MD1

MD0

/M_DV

M_CK

/M_ER

/IR_COL_OUT

/IR_COL_IN

74ABT125C

VCC

/IRD_V

/IR_COL

RDIO

RRDIR

74ABT125C

RDC

RDIO

RDC

/SDV

VCC

74ABT125C

74F27

To/From Other 100RICs

74ABT244C

VCC

74ABT125C

74F27

RDIR

VCC

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