CDB61884
2. BOARD COMPONENT DESCRIPTIONS
2.1 Power Connections
Power for the evaluation board is supplied by an In both hardware and host modes, the MCLK pin is
2.2
Master Clock Selection
external +3.3 V DC power supply. A +5 V DC
power supply can also be connected to the on-board
control logic. The LED labeled “D3” will illumi-
nate when power is supplied to the on-board con-
trol logic.
configured by placing a short block on one of the
positions of bed stake header J1. Figure 3 shows
the different positions of the J1 bed stake header.
– Connect the +3.3 VDC power supply to the +3V
binding post and the +5 VDC power supply to
the +5 V binding post if 5 Volt logic is required
– Jumper J13 shown in Figure 2 allows all the
external logic on the evaluation board to be
connected to either +3 V or +5 V binding post.
MCLK
MCLK
J13
3 V
J1
Data Recovery Mode
J1
On-board Oscillator
V LO G IC
5 V
O n-board logic connected
to +3 V binding post
J13
3 V
MCLK
MCLK
V LO G IC
J1
J1
External Clock Source
Receivers Powered Down
5 V
O n-board logic connected
to +5 V binding post
Figure 3. Master Clock Selections
Figure 2. On-board Logic Power Selection
– A 2.048 MHz clock oscillator is provided on the
evaluation board for use as the on-board clock
source for all E1 modes.
– To measure the current consumption of only
the CS61884 device, place a short block on
Jumper J13 to connect the Vlogic power
supplies to the +5 V binding post. This will
isolate the CS61884 device from all the on-
board logic, to allow the current measurement
to be made at the +3 V binding post.
– A 1.544 MHz clock oscillator is also provided
with the evaluation board for use as the on-
board clock source for the T1/J1 operation
modes.
– A BNC connector (labeled J16) provides the
connection for an external clock source.
DS485DB1
5
CIRRUS [ CIRRUS LOGIC ]
