ACS411CS datasheet(8/43 Pages) SEMTECH

8 / 43 page

ACS411CS PRE-RELEASE Issue 6.0 July 1999.

Diagnostic modes (main channel)

The ACS4110 has four diagnostic/configuration modes

implemented for the main channels, configured by

CM(3:1). The following diagnostic / configuration modes

are implemented for the main channels:

- full duplex

- full duplex slave

- full duplex master

- remote loop-back

- local loop-back

The modes are selectable via CM(3:1) either directly

via pins, via the microprocessor interface or via remote

control setup. All modes remote loop-back and local

loop-back are selectable individually for each channel

via the microprocessor interface. Table 5. shows the

selection of diagnostic modes and configurations.

CM(3:1)

Diagnostic Mode/Configuration

111

local loop-back initiated from far end

(remote setup only)

110

remote loop-back initiated from far end

101

local loop-back

100

remote loop-back

011

full duplex master

010

full duplex slave

001

full duplex slave/remote full duplex

(remote setup only)

000

full duplex

Table 5: Selection of diagnostic modes

In remote setup (ENRSB=0), the far-end device will be

setup complementary to the near-end device (control

device) according to the Table 6.

CM(3:1)

Near End initiate

Far End initiate

(Control device)

(Remote control device)

111

full duplex

local loop-back

110

remote loop-back

101

local loop-back

full duplex

100

remote loop-back

011

full-fuplex master

full-duplex slave

010

full-duplex slave

full-duplex master

001

full-duplex slave

full-duplex

000

full duplex

Table 6: Selection of diagnostic modes

* Remote Loop-back Detect.

For a remote loop-back initiated from the far end

device, CM(3:1)=110, the initiating end transmitting

and receiving the data will be setup as full duplex (see

Figure:1).

For remote loop-back, CM(3:1)=100, the remote

loopback is initiated from the near end.

In both cases, the data that is looped back will be the

data applied to the near end device (see Figure:1).

All modes are selectable via CM(3:1) either directly via

pins or via the microprocessor interface. All the

diagnostic modes, including remote loop-back and

local loop-back are selectable individually for each

main and maintenance channel via the microprocessor

interface.

Full-Duplex

In the full-duplex configuration, the RCLK clock of

both devices track the average frequency of the

corresponding TCLK clock of the opposite end of

the link. The receiving Digital-Phase-Lock Loop

(DPLL) system makes periodic adjustments to the

RCLK clock to ensure that the average frequency is

exactly the same as the far-end TCLK clock. In

summary, each TCLK is an independent master clock

and each RCLK a slave of the far-end TCLK clock.

The relationship between TmCLK and RmCLK are

treated similarly.

Full-Duplex Slave

In slave mode, the TCLK and RCLK clock is derived

from the TCLK clock of the far-end modem, such

that their average frequencies are identical. Clearly,

it is essential that only one modem within a

communicating pair is configured in slave mode. The

CKC pin should be forced to GND, so that TCLK is

always configured as an output.

The relationship between TmCLK and RmCLK are

treated similarly. The CKM pin should be forced to

GND, so that TmCLK is always configured as an

output.

Full-Duplex Master

In master mode, the local RCLK clock is internally

generated from the local TCLK clock.

The local

TCLK clock may be internally or externally generated.

Master mode is only valid if the far-end device is

configured in slave mode or if the far-end TCLK clock

is derived from the far-end RCLK clock. Only one

modem within a communicating pair may be

configured as a master.

The relationship between TmCLK and RmCLK are

treated similarly.

Local Loopback

In local loopback mode, TPN and TmD data is looped

back inside the near-end modem and is output at its

own RPN and RmD outputs.

Data received from the far-end device is ignored,

except to maintain lock. If concurrent requests occur

for local and remote loopback, local loopback is

selected. The local loopback diagnostic mode is used

to test data flow up to, and back from, the local

ACS4110 and does not test the integrity of the link

itself.

Therefore,

local

loopback

operates

independently of synchronisation with a second

modem (i.e. DCD may be High or Low). The local

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