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Audio applications using an 8 kHz sampling rate, such
as voice acquisition and text-to-speech, can be
implemented on this low-cost half-card with an on-board
CODEC.
Analog I/O
A Motorola MC145505P CODEC performs the analog-to-digital
conversion in mulaw or A-law format. Input and output
amplifiers are independently adjustable by trim pots. The
endplate accommodates a subminiature DB-15 for bit I/O as
well as two RCA phono-jacks and an RJ-11 modular phone
handset adaptor (not a subscriber line interface) for
analog signals.
Parallel Port
Since the host to DSP communications has been implemented
with an 8-bit interface, the upper byte of the DSP's PIOP
port can be used to communicate with external equipment.
This byte is separated into two 4-bit nibbles. The
direction of data flow of each nibble is independently
software selectable. In addition to these 8 bidirectional
data lines, INTREQ1 & 2, IACK1 & 2, and the RESET
signals are made available at the subminiature DB-15
connector on the endplate.
Jumper Options
- Mulaw or A-law CODEC format.
- Input amplifier selected for either noise
immunity or protection from common-mode overload.
- DC coupled or not.
- Input mic bias (required for handset use).
- 600 ohm line terminator.
- Single ended or balanced input and output.
Host Interface
An 8-bit I/O mapped ISA interface supports programmed
data transfers. Jumpers are used to set the board's
address up to 0x3F0.
Interrupts
Either the host or data from the DSP's serial port can
interrupt the DSP. The DSP, in turn, can interrupt the
host using IRQ2 through IRQ7 (hardware selectable) by
either the PDF or PIF flags.
Specifications
| Lucent WE DSP32C Rev 35 processor |
| 49.152 MHz clock ~25 MFLOPS |
| 6K bytes on-chip RAM |
| 256K zero wait-state |
| 4.2" x 5" half-size
single XT slot |
| 8-bit I/O mapped ISA bus |
| 2.0 watts @ 5v for 50 MHz |
| 2.5 watts @ 5v for 80 MHz |
Performance
| 1.2 Mbyte/sec data transfer rate |
| 1024 complex FFT in 2.1 msec* |
| 3x3 matrix multiply in 2.0 us* |
| *excludes data transfer between
DSP and host |
XC5-C0
P/N: A2A2 (50 MHz)
P/N: A2D2 (80 MHz)
These boards have the same host interface, interrupts,
memory, specifications and performance as the CODEC
version listed above but replaces the analog section with
a 40/25 Mbps serial I/O interface. These buffered serial
lines are available at the 15-pin D-type female
connector. The direction of these signals, incoming or
outgoing, are controlled by jumpers. The DSP's serial
port is available, unbuffered, at the DSP-IN and DSP-OUT
14-pin sockets for interconnection with other DSP or
analog boards.
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