ACS4110 Ver la hoja de datos (PDF) - Semtech Corporation
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ACS4110 Datasheet PDF : 43 Pages
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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:
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
- 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.
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
CM(3:1)
111
110
101
100
011
010
001
000
Near End initiate
(Control device)
full duplex
*
local loop-back
remote loop-back
full-fuplex master
full-duplex slave
full-duplex slave
full duplex
Far End initiate
(Remote control device)
local loop-back
remote loop-back
full duplex
*
full-duplex slave
full-duplex master
full-duplex
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).
ACS411CS PRE-RELEASE Issue 6.0 July 1999.
8
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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