SI3225PPT-EVB SILABS [Silicon Laboratories], SI3225PPT-EVB Datasheet - Page 2

• Manufacturer Part Number: SI3225PPT-EVB
• Description: EVALUATION BOARD FOR THE Si3225 DUAL PROSLIC
• Manufacturer: SILABS [Silicon Laboratories]

Si3225PPT-EVB
ProSLIC LINC Evaluation Software
The ProSLIC LINC software is an executable program
that allows control and monitoring of the ProSLIC. It
utilizes the primary LPT port of a standard PC to
communicate with the ProSLIC’s SPI port.
To install the software, insert the Silicon Laboratories
ProSLIC CD into the computer. The setup routine can
be invoked by running the setup.exe program in the root
directory of the CD.
Invoking the ProSLIC LINC is achieved by double
clicking the ProSLIC LINC icon. Refer to the ProSLIC
LINC User Guide for software operation.
Si3225PPT-EVB Dual ProSLIC Evaluation
Board Description
The schematics for the Dual ProSLIC evaluation
daughter card are shown in Figures 1 through 3. The
schematic in Figure 1 shows the Dual ProSLIC linecard
implementation. All circuitry pertaining to the telephony
function of the Dual ProSLIC is found here. Figure 2
contains a number of options for secondary fault
protection. Secondary protection components can be
selected for a given level of protection against expected
faults. Figure 3 illustrates the serial control interface,
PCM interface, daisy chain ports, and power supply
filtering and connections. These schematics represent
typical linefeed components for the ProSLIC.
The layout of the Dual ProSLIC evaluation daughter
card is found in Figures 4, 5, and 6. Figure 4 shows the
component placement while Figures 5 and 6 show the
two layers of component interconnect. For optimum
thermal performance of the Si3200, the daughter card
has inner VDD and GND layers. These layers are
omitted from the figures in this data sheet. The signal
flow is digital PCM on the left to two-wire analog on the
right.
Signal requirements for ProSLIC operation are PCLK
(PCM clock), FS (frame sync), and Serial IO. The
ProSLIC motherboard has a local oscillator with a
programmable logic device to provide the ProSLIC
PCLK and FS signals. The DIP switch (S2) sets the
PCLK frequency and controls the FS enable. See
Table 1 for S2 settings. JP3 and JP4 select this internal
2
Rev. 1.0
clock source or an external PCM clock source. The
ProSLIC motherboard has been designed to directly
connect to an Audio Precision SIA-2322 Serial Interface
Adapter through the 15 pin d-connectors, P2 and P3.
See Table 2 for the Audio Precision settings. The
ProSLIC evaluation board has also been designed to
interface with a Wandel and Goltermann PCM-4 through
J8, J9, J10, and J11. See Table 3 for PCM-4 settings. A
header, J5, allows access to the ProSLIC’s PCM signals
for connection to other PCM testing devices or an actual
telephone system PCM bus. TIP and RING of the
two-wire analog interface are present at the RJ-11
connectors, J1 and J11, of the Dual ProSLIC daughter
card.
The schematics of the ProSLIC motherboard are found
in Figures 7, 8, and 9. Figure 7 shows the connections
from the motherboard to the daughter card. Figure 8
illustrates the LPT port connection to the SPI drivers.
The PCM highway and LED indicators are shown in
Figure 9.
The ProSLIC evaluation board is voltage-programmable
with specific jumper settings. JP1 selects 3 V or 5 V
ProSLIC operation. JP2 selects 3 V or 5 V PCM source
level compatibility. These should be placed on the
expected setting.
Power is connected to the ProSLIC at J2, J3, and J4.
5 V is always required for the buffers, U2 and U3, to
interface to the parallel port. The ProSLIC can be
powered from 5 V or 3 V with the placement of a jumper
on JP1. The Protection Return connections on J6
should be connected to an appropriate ground for
TIP/RING fault testing. This return is tied to signal
ground on-board though it has a dedicated trace for
high-current conditions. Serial control of the ProSLIC is
achieved by toggling select bits of a standard parallel
port. The parallel port connection is available at P1 and
J1.
Multiple dual ProSLIC cards can be daisy-chained by
stacking the cards. Stack up to eight cards by aligning
JS1–JS5 and pressing together. The ProSLIC LINC
Software allows channel selection for RAM and register
manipulation.