ACS411CS datasheet(13/43 Pages) SEMTECH

13 / 43 page

ACS411CS PRE-RELEASE Issue 6.0 July 1999.

SERIAL mode

The SERIAL mode (uPSEL = 5) enables the

ACS4110 to interface with a serial microprocessor

bus. The bus interface pins are defined in Table 14.

Dir

Description

CSB

Active low chip select

ALE

= SCLK: Serial interface clock

A(1)

= CLKE: Active SCLK edge selection

control bit

A(0)

= SDI: Serial data input

AD(0)

= SDO: Serial data output

Table 14: uP Bus Interface Pins for SERIAL mode.

Remote Control

The device setup of one modem can be over-ridden

with the device set up from the other modem when

remote control is enabled from the ENRSB pin. To

enable remote control mode, ENRSB pin is held Low

(Logic 0). If a modem is set up in remote control, the

data from the control modem overides the local

microprocessor interface or pin set-up of the remote

controlled modem. The signals that will be over-ridden

are defined in Table 15.

Name

Description

ch_enb(16:1) Channel enable defined in local microprocessor

for individual channel setup

DR(3:1)

Data rate select

POL(3:1)

Line code polarity select

CM(2:1)

Configuration mode(full-duplex/master/slave)

TRSEL

Clock edge select for transmit clocks

RESEL

Clock edge select for receive clocks

CKM

Clock direction select maintenance channel

CKC

Clock direction select main channels(combined)

MSEL(3:1)

Maintenance channel data rate select

Table 15: Remote Control Device Setup.

Remote control is only possible in one direction (only

one modem allowed with ENRSB = 0).

ACS411CS

twin fiber link

ENRSB = 0

Control Modem

ACS411CS

Remote Controlled Modem

ENRSB = 1

CKLOCAL

CM(3:1), POL(3:1)

CKC, CKM, TRSEL, RESEL

DR(3:1), MSEL(3:1)

CM(3:1), POL(3:1)

DR(3:1), MSEL(3:1)

CKC, CKM, TRSEL, RESEL

CKLOCAL=0:

CKC, CKM, TRSEL, RESEL

CKLOCAL=1:

The near-end modem has to be setup as the control

device (ENRSB=0) in order to configure the far-end by

remote control. If both modems are setup as control

devices (ENRSB=0), data transmission and reception

will be disabled.

When in remote setup, the signal CKLOCAL selects

whether the Tx/Rx clock settings (CKC, CKM, RESEL,

TRSEL, trsel_m and resel_m) should be taken from

the controlling device (CKLOCAL=0) or locally

(CKLOCAL=1).

The diagram in Figure 1 shows the configurations in

Remote Control mode.

Figure 3: Remote Control Mode and ENRSB.

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