Memotec CX900e, Hardware Reference Manual, Page: 96 / 200

CX900e Hardware Reference Manual
9-2
3006M100-002
9.1 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 9-1. Figure 9-2 provides a functional
block diagram of the card.
9.1.1 CX900e I/O Bus
The CX900e 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 CX900e I/O bus. Connection of the I/O bus to the
motherboard is via a 120-pin card edge connector.
9.1.2 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.
9.1.3 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 9-1 DAV I/O Card (without SLIM LIDs)
e d g e c o n n e cto r
(to m o th e rb o a rd e xp a n sio n s lo ts )
co n n e c to r p la te L ID so c ke ts
L ID s o ck e ts
D S P
P L D