Evaluation Kit User Manual
EV9000
2001 Consumer Microcircuits Limited
15
UM9000/2
3.2.3 Connectors
Clamping connectors are distributed around the perimeter of the EV9000 motherboard as shown
in Figure 5. Silkscreen labels on the motherboard identify these connectors, listed in Table 6.
Name Type
Description
Supply
+5V
power
Positive digital supply voltage for the motherboard. Used to supply
most components used in the parallel port interface as well as
buffering and amplifier circuits in the modem circuits.
-5V
power
Interface circuit negative supply
GND
power
Routed separate from the modem circuits’ signal grounds to
reduce the amount of ground noise which is injected (from the PC
interface circuits) into the modem circuits.
+5VM
power
The positive supply for both Channel A and B modem ICs. It may
be set independent of the +5V positive supply to support modem
experiments over realistic supply voltage ranges.
AGND
power
The analogue ground for analogue signals including Rx, Tx, and
injected noise. Several connectors are provided with access to
this node.
Channel A
RXINA
input
Receive input modem channel A
TXOUTA
output
Transmit output modem channel A
NSA1
input
Noise source input #1 modem channel A
NSA2
input
Noise source input #2 modem channel A
Channel B
RXINB
input
Receive input modem channel B
TXOUTB
output
Transmit output modem channel B
NSB
input
Noise source input modem channel B
Radio Control
PTT
output
Push to talk, used to key an attached transceiver
CS
input
Carrier sense input indicates that Rx data is (or will soon be) valid
Table 6: Connector Signal Descriptions
3.2.4 Signal
Flow
The following block diagrams (Figures 6 to 9) indicate the modem signal flow paths. These
diagrams use coded variables as described in Table 7.
Key Meaning
Key Meaning
K#
adjustable gain via potentiometer
sw# switch control via software
v#
adjustable bias via potentiometer
E#
jumper
Table 7: Signal Path Block Diagram Key