CX950 Hardware Reference Manual
8-2
3021M100-002
8.1 DAV I/O Card Components
This section describes the major components of the DAV I/O card. The physical
layout of the components is shown in Figure 8-1. Figure 8-2 provides a functional
block diagram of the card.
8.1.1 CX950 I/O Bus
The CX950 I/O bus carries the address bus, data bus, and clocking and control
signals from the motherboard CPU to the DAV I/O card. Transceivers interface
the local buses to the CX950 I/O bus. Connection of the I/O bus to the
motherboard is via a 120-pin card edge connector.
8.1.2 Digital Signal Processor
The Digital Signal Processor (DSP) is the core of the DAV I/O card. The DSP
uses fixed point arithmetic suitable for G.729 voice compression. A 64k x 16
SRAM provides external memory to the DSP.
8.1.3 Analog Interface Controller
Two Analog Interface Controllers (AICs) provide bi-directional analog interfaces
to the voice SLIM LIDs. The analog interface between the SLIM LIDs and the
AICs are differential to minimize noise.
Figure 8-1 DAV I/O Card (without SLIM LIDs)
edge connector
(to motherboard expansion slots)
connector plateLID sockets
LID sockets
DSP
PLD
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