Z8932120FSC ZILOG [Zilog, Inc.], Z8932120FSC Datasheet - Page 29

• Manufacturer Part Number: Z8932120FSC
• Description: 16-BIT DIGITAL SIGNAL PROCESSORS
• Manufacturer: ZILOG [Zilog, Inc.]

Zilog
A/D Accommodation
The CODEC interface can be used for serial A/D or serial
D/A transmission. The interface provides the necessary
control signals to adapt to many standard serial convert-
ers. The low-pass and smoothing filters are necessary for
systems with converters.
Note: Calculations consider the interrupt access time (typically
four cycles), transfer of data, loading of new data, and latency pe-
riods between CODEC transfers. During the interrupt cycle, de-
velopers often execute additional software, affecting the
maximum transfer rate. Calculations are for single-channel trans-
fers only.
DS97DSP0100
Maximum Frame Sync
Maximum SCLK
Transmission
Stereo (64-bit)
Table 7. Tabulated Transmission Rates*
Z89321/371/391
16-bit
8-bit
SCLK
FSO
RXD
TXD
FS1
Figure 26. A/D, D/A Implementation Block Diagram
769.2 kHz
476.2 kHz
263.2 kHz
10 Mbps
Rate
P R E L I M I N A R Y
CLKIN
Communicate
Data
CLKIN
Serial
Data In
Communicate
Data
Serial
Data Out
Serial A/D
Serial A/D
High-Speed Serial Port
The Z89321 CODEC interface can be used as a high-
speed serial port. The necessary control signals are pro-
vided for adaptation to standard processors or external pe-
ripherals. Byte, word, or 64-bit data can be transmitted at
speeds up to 10 Mbps. (Condition includes a 20 MHz os-
cillator. Data can be transferred with single-cycle instruc-
tions to an internal register file.)
8-Bit CODEC Interface
The Z89321 provides an option for a standard 8-bit CO-
DEC interface. Hardware m-law compression is available
(expansion performed by software lookup table). The CO-
DEC interface transmits data consisting of 8-bit or com-
pounded 8-bit information. Figure 27 shows a typical sche-
matic arrangement.
The timing for this type of arrangement is presented in Fig-
ure 28. The flexible design provides adaptation for 16-bit
linear CODEC.
Smoothing
Low-Pass
Filter
Filter
16-Bit Digital Signal Processors
Z89321/371/391
Analog
In
Analog
Out
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