COM20019IP datasheet(66/81 Pages) SMSC

66 / 81 page

DISCONTINUED DATASHEET

Data Hold from nWR High

nWR Low Width

nWR High Width

nRD

to nWR Low

A0-A2

VALID DATA

VALID

D0-D7

nCS

Note 2

nWR

nRD

t10

Note 3

t5**

t10

Parameter

Address Setup to nWR Active

nCS Setup to WR Active

Valid Data Setup to nWR High

min

max

4TARB

30***

units

nCS Hold from nWR Inactive

Address Hold from nWR Inactive

Cycle Time (nWR

to Next

)**

***:

nCS may become active after control becomes active, but the data setup time will now

be 30 nS measured from the later of nCS falling or Valid Data available.

The Microcontroller typically accesses the COM20019 on every other cycle.

Therefore, the cycle time specified in the microcontroller's datasheet

should be doubled when considering back-to-back COM20019 cycles.

Note 1:

Note 2: Any cycle occurring after a write to the Address Pointer Low Register

requires a minimum of 4TARB from the trailing edge of nWR to the leading edge

of the next nWR.

TARB is the Arbitration Clock Period

TARB is identical to Topr if SLOW ARB = 0

TARB is twice Topr if SLOW ARB = 1

Topr is the period of operation clock. Same as the XTAL1 period.

Write cycle for Address Pointer Low Register occurring after a write to Data

leading edge of the next nWR.

Note 3:

Write cycle for Address Pointer Low Register occurring after a read from Data

leading edge of nWR.

COM20019IP データシート(PDF) 66 Page - SMSC Corporation

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