ACS411CS Semtech Corporation, ACS411CS Datasheet - Page 13

• Manufacturer Part Number: ACS411CS
• Description: Acapella Optical Modem ic
• Manufacturer: Semtech Corporation

The SERIAL mode (uPSEL = 5) enables the
ACS4110 to interface with a serial microprocessor
bus. The bus interface pins are defined in Table 14.
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.
Remote control is only possible in one direction (only
one modem allowed with ENRSB = 0).
Remote Control
SERIAL mode
Name
ch_enb(16:1) Channel enable defined in local microprocessor
DR(3:1)
POL(3:1)
CM(2:1)
TRSEL
RESEL
CKM
CKC
MSEL(3:1)
Pin
CSB
ALE
A(1)
A(0)
AD(0)
Table 14: uP Bus Interface Pins for SERIAL mode.
Table 15: Remote Control Device Setup.
I
I
Dir
I
I
O
for individual channel setup
Data rate select
Line code polarity select
Configuration mode(full-duplex/master/slave)
Clock edge select for transmit clocks
Clock edge select for receive clocks
Clock direction select maintenance channel
Clock direction select main channels(combined)
Maintenance channel data rate select
Active low chip select
= SCLK: Serial interface clock
= CLKE: Active SCLK edge selection
= SDI: Serial data input
= SDO: Serial data output
control bit
Control Modem
Description
Description
ACS411CS
Figure 3: Remote Control Mode and ENRSB.
twin fiber link
13
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.
Remote Controlled Modem
ACS411CS
ACS411CS PRE-RELEASE Issue 6.0 July 1999.