LAN9220 datasheet(121/142 Pages) MICROCHIP

Part #	LAN9220

Description	16-bit Non-PCI Small Form Factor 10/100 Ethernet Controller with Variable Voltage I/O & HP Auto-MDIX Support

PDF	142 Pages

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Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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DS00002417A-page 121

LAN9220

6.7

PIO Writes

PIO writes are used for all LAN9220 write cycles. PIO writes can be performed using Chip Select (nCS) or Write Enable

(nWR). Either or both of these control signals must go high between cycles for the period specified.

FIGURE 6-6:

PIO WRITE CYCLE TIMING

Note:

The “Data Bus” width is 16 bits.

TABLE 6-7:

PIO WRITE CYCLE TIMING

Symbol

Description

MIN

TYP

MAX

Units

tcycle

Write Cycle Time

165

tcsl

nCS, nWR Assertion Time

tcsh

nCS, nWR Deassertion Time (see Note below)

133

tasu

Address Setup to nCS, nWR Assertion

tah

Address Hold Time

tdsu

Data Setup to nCS, nWR Deassertion

tdh

Data Hold Time

Note:

A PIO Write cycle begins when both nCS and nWR are asserted. The cycle ends when either or both nCS

and nWR are deasserted. They may be asserted and deasserted in any order. Parameters tcsh and tcsl

must be extended using wait states to meet the tcycle minimum.

Data Bus

nCS, nWR

A[7:1]

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