LAN9252VSLASHML datasheet(22/329 Pages) MICROCHIP

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LAN9252

DS00001909A-page 22

 2015 Microchip Technology Inc.

TABLE 3-7:

HOST BUS PIN DESCRIPTIONS

Num

Pins

Name

Symbol

Buffer

Type

Description

Read

VIS

This pin is the host bus read strobe.

Normally active low, the polarity can be changed via

the HBI Read, Read/Write Polarity bit of the PDI

Configuration Register (HBI Modes).

Read or Write

RD_WR

VIS

This pin is the host bus direction control. Used in

conjunction with the ENB pin, it indicates a read or

write operation.

The normal polarity is read when 1, write when 0 (R/

nW) but can be changed via the HBI Read, Read/

Write Polarity bit of the PDI Configuration Register

(HBI Modes).

Write

VIS

This pin is the host bus write strobe.

Normally active low, the polarity can be changed via

the HBI Write, Enable Polarity bit of the PDI Config-

uration Register (HBI Modes).

Enable

ENB

VIS

This pin is the host bus data enable strobe. Used in

conjunction with the RD_WR pin it indicates the

data phase of the operation.

Normally active low, the polarity can be changed via

the HBI Write, Enable Polarity bit of the PDI Config-

uration Register (HBI Modes).

Chip Select

VIS

This pin is the host bus chip select and indicates

that the device is selected for the current transfer.

Normally active low, the polarity can be changed via

the HBI Chip Select Polarity bit of the PDI Configu-

ration Register (HBI Modes).

5Address

A[4:0]

VIS

These pins provide the address for non-multiplexed

address mode.

In 16-bit data mode, bit 0 is not used.

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