AM79212JC AMD (ADVANCED MICRO DEVICES), AM79212JC Datasheet - Page 10

• Manufacturer Part Number: AM79212JC
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AM79212JC

• Lead Free Status / RoHS Status: Supplier Unconfirmed

ASLAC Device
AGND
Analog (Quiet) Ground
VREF is referenced to this ground.
C2–C1
ASLIC Device Control (Output)
These ternary logic output pins are dedicated to
controlling the operating state of the ASLIC device. The
levels of these outputs are logic High, logic Low, and
High impedance.
DCL
GCI Clock (Input)
This input controls the clocking of the GCI data and is
also used as the master clock for the CODEC and DSP.
2.048 MHz or 4.096 MHz clock frequencies can be used.
In either case, the GCI bit rate is always 2.048 MHz.
DD
Downstream GCI Data (Input)
Downstream data is received serially on the DD port
every 125 µs at the DCL rate.
DGND
Digital Ground
This is digital ground return.
DU
Upstream GCI Data (Output)
Upstream data is sent serially on the DU pin every 125 µs
at the DCL rate. DU is high impedance between bursts.
This pin is an open drain output.
FS
Frame Sync (Input)
The Frame Sync signal is an 8 kHz pulse that identifies
the beginning of a GCI frame. The ASLAC device
references the timing of back-plane data transfer to this
input. The back-plane data bit rate must be
synchronized to DCL.
I1
Control Port (Input)
This input port is TTL compatible and can be used to
monitor an external TTL compatible device. The logic
state of this pin appears in the I1 bit (bit 2) of the
upstream C/I channel.
10
Am79212/Am79C202 Data Sheet
P R E L I M I N A R Y
IAB
Loop Voltage Sense (Input)
The IAB pin is a current summing node referenced to
VREF. An external resistor (RAB) is connected between
this pin and the VDC pin of the ASLIC device. In normal
operation, current flows out of this pin. When the ASLIC
device is in thermal shutdown, current will be forced into
this pin.
IBAT
Battery Voltage Sense (Input)
The IBAT pin is a current summing node referenced to
AGND and receives a current that is proportional to the
system battery voltage. A sense resistor/capacitor
network is connected between the VBAT pin of the
ASLIC device and the IBAT pin.
IDC
DC Loop Control Current (Output)
The IDC output supplies a current to the ASLIC device
for proportional control of the DC loop current flowing
through the subscriber loop.
IDIF
Longitudinal Sense (Input)
IDIF is a current input pin and is fed by the IDIF pin of the
ASLIC device. The current in this pin is used by the
ASLAC device for supervisory and diagnostic functions.
The IDIF pin has an internal input resistance so an
external longitudinal noise-filter capacitor can be
connected.
I/O1, I/O2
Control Ports (Input/Output)
These control lines are TTL compatible and each can
be programmed as an input or an output. When
programmed as inputs, they can monitor external, TTL-
compatible logic circuits. In the output mode, these pins
are controlled by the I/O1 and I/O2 bits in the
downstream C/I channel. In the output or input modes,
the logic state of these pins appears in the I/O1 and I/
O2 bits of the upstream C/I channel. When programmed
as outputs, they can control an external logic device or
they can be connected to pin C3, C4, or C5 of the ASLIC
device to control test relay drivers RY1OUT, RY2OUT,
and RY3OUT.