ICS1894-33 datasheet(10/39 Pages) RENESAS

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ICS1894-33

10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE

PHYCEIVER

IDT® 10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE

ICS1894-33

REV A 021612

Receive Error (RX_ER)

RX_ER is asserted for one or more REFIN periods to

indicate that an error (e.g. a coding error or any error that a

PHY is capable of detecting, and that may otherwise be

undetectable by the MAC sub-layer) was detected

somewhere in the frame presently being transferred from

the PHY. RX_ER transitions synchronously with respect to

REFIN. While CRS_DV is de-asserted, RX_ER has no

effect on the MAC.

Auto-MDI/MDIX Crossover

The ICS1894-33 includes the auto-MDI/MDIX crossover

feature. In a typical CAT 5 Ethernet installation the transmit

twisted pair signal pins of the RJ45 connector are crossed

over in the CAT 5 wiring to the partners receive twisted pair

signal pins and receive twisted pair to the partners transmit

twisted pair. This is usually accomplished in the wiring plant.

Hubs generally wire the RJ45 connector crossed to

accomplish the crossover. Two types of CAT 5 cables

(straight and crossed) are available to achieve the correct

connection. The Auto-MDI/MDIX feature automatically

corrects for miss-wired installations by automatically

swapping transmit and receive signal pairs at the PHY when

no link results. Auto-MDI/MDIX is automatic, but may be

disabled for test purposes by writing MDIO register 19 Bits

9:8 in the MDIO register. The Auto-MDI/MDIX function is

independent of Auto-Negotiation and preceeds

Auto-Negotiation when enabled.

Auto MDI/MDIX Table

Definitions:

straight

transmit = TP_AP & TP_AN

receive = TP_BP & TP_BN

cross

transmit = TP_BP & TP_BN

receive = TP_AP & TP_AN

AMDIX_EN (Pin 14) AMDIX enable pin with 20 kOhm

pull-up resistor

AMDIX_EN [19:9] MDIO register 19h bit 9

MDI_MODE [19:8] MDIO register 19h bit 8

AMDIX_EN

(pin 14)

AMDIX_EN

[Reg 19:9]

MDI_MODE

[Reg 19:8]

Tx/Rx MDI

Configuration

straight

cross

straight

straight/cross (auto

select)

Default

straight/cross (auto

select)

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