DP83848I_14 datasheet(81/97 Pages) TI1

Part #	DP83848I

Description	PHYTER Industrial Temperature Single Port 10/100 Mb/s Ethernet Physical Layer Transceiver

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Manufacturer	TI1 [Texas Instruments]

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8.2.27 RMII Receive Timing

Note: Per the RMII Specification, output delays assume a 25pF load.

Note: CRS_DV is asserted asynchronously in order to minimize latency of control signals through the why. CRS_DV may

toggle synchronously at the end of the packet to indicate CRS deassertion.

Note: RX_DV is synchronous to X1. While not part of the RMII specification, this signal is provided to simplify recovery of

receive data.

Parameter

Description

Notes

Min

Typ

Max

Units

T2.27.1

X1 Clock Period

50 MHz Reference Clock

20

ns

T2.27.2

RXD[1:0], CRS_DV, RX_DV

and RX_ER output delay from

X1 rising

2

14

ns

T2.27.3

CRS ON delay

From JK symbol on PMD Receive Pair to

initial assertion of CRS_DV

18.5

bits

T2.27.4

CRS OFF delay

From TR symbol on PMD Receive Pair to

initial deassertion of CRS_DV

27

bits

T2.27.5

RXD[1:0] and RX_ER latency

From symbol on Receive Pair. Elasticity

buffer set to default value (01)

38

bits

CRS_DV

X1

RXD[1:0]

RX_ER

T2.27.2

T2.27.1

T2.27.2

PMD Input Pair

IDLE

Data

(J/K)

T2.27.3

T2.27.5

Data

(TR)

T2.27.4

RX_DV

T2.27.2

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