IA82527-PTQ44A-R datasheet(11/45 Pages) INNOVASIC

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IA82527

04 May 2007

CAN Serial Communications Controller

As of Production Ver. 00

PRELIMINARY



 2007

EN21070504-00

www.Innovasic.com

Customer Support:

Page 11 of 45

1-888-824-4184

Table 3. IA82527 Pin/Signal Descriptions, continued

Signal

Name

PLCC

QFP

Description

ale/as

address strobe. Input. Active High. Mode 2.

When the IA82527 is configured to operate in either the 8-bit

multiplexed non-Intel

® architecture mode (Mode 2), this signal latches

the address into the device during the address phase of the bus

cycle.

NOTE: If the IA82527 is configured to operate in Mode 3 (8-bit non-

multiplexed non-Intel

® architecture), this pin must be tied high.

clkout

—

clock out. Output (push-pull).

This output provides a programmable clock frequency. The

frequency is set via the Clockout Register (1FH) and can range from

the frequency of the xtal (crystal) input to xtal/n, where n can be an

integer value from 2 through 15. This output allows the IA82527 to

clock other devices such as the host CPU.

a1/ad1/cp

clock phase. Input. Serial Interface Mode.

When this input is a logic 0, data are sampled on the rising edge of

sclk. When this input is a logic 1, data are sampled on the falling

edge of sclk.

cs_n

—

chip select. Input. Active Low (Modes 0–3); Selectable Active Level

(Serial Interface Mode).

When the IA82527 is configured to operate in one of the parallel

interface modes (Modes 0–3) or the Serial Interface Mode, this input,

during its active state, selects the device allowing CPU access.

For Serial Interface Mode operation, the active state is selectable

(i.e., either high or low) via the IA8257 csas pin.

csas

a2/ad2/csas

chip select active state. Input. Serial Interface Mode.

When this input is a logic 0, the cs_n input is configured to function

active low. When this input is a logic 1, the cs_n input is configured

to function active high.

ad8/d0/p1.0

ad9/d1/p1.1

ad10/d2/p1.2

ad11/d3/p1.3

ad12/d4/p1.4

ad13/d5/p1.5

ad14/d6/p1.6

ad15/d7/p1.7

data bits 7–0. Input/Output. Mode 3.

When the IA82527 is configured to operate in the 8-bit non-

multiplexed non-Intel

® architecture mode (Mode 3), these lines

provide the 8-bit data bus to the device.

continued

. . .

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