Z87L01 Zilog., Z87L01 Datasheet - Page 19

• Manufacturer Part Number: Z87L01
• Description: ROMless Spread Spectrum Cordless Phone Controller
• Manufacturer: Zilog.

Z87001/Z87L01
ROMless Spread Spectrum Cordless Phone Controller
FUNCTIONAL DESCRIPTION
The functional partitioning of the Z87001 is shown in Fig-
ure 2. The chip consists of a receiver, a transmitter, and
several additional functional blocks.The receiver consists
of the following blocks:
The Transmitter Consists of the Following Blocks:
19
Receive 1-bit ADC
Demodulator, including:
–
–
–
–
–
–
–
–
Receive Frame Timing Counter
Receive Buffer and Voice Interface
Transmit Buffer and Voice Interface
Transmit Frame Timing Counter (used on base station
only)
Modulator, including:
–
–
IF Downconverter
AFC (Automatic Frequency Control)
Limiter-Discriminator
Matched Filter
Bit Synchronizer
Bit Inversion
Frame Synchronizer (unique word detector)
SNR Detector
NCO
Bit Inversion
HANDSET
BASE
HOP
Frequency
Hopping
guard time
Figure 1. Basic Time Duplex Timing
144 bits
P R E L I M I N A R Y
TX
RX
In Addition, there are the following Shared Blocks.
Basic Operation
The transmitter and receiver operate in time-division du-
plex (TDD): handset and base station transmit and receive
alternately. The TDD duty cycle lasts 4 ms and consists of
the following events:
4ms frame
TDD switching
Transmit 4-Bit DAC
Event Trigger Block, Controlling:
–
–
–
4-Bit DAC for Setting Transmit Power Level
8-Bit ADC for Sampling the Received Signal Strength
Indicator (RSSI)
DSP Core Processor
Two 16-Bit General-Purpose I/O Ports
Z87010 ADPCM Processor Interface
At the beginning of the cycle, the frequency is changed
(hopping)
The base station transmits a frame of 144 bits while the
handset receives
The handset then transmits a frame of 148 bits while the
base receives.
guard time
Transmit/Receive Switch
Power On/Off Switches (Modulator, Demodulator,
RF Module)
Antenna Switch Control (used on Base Station
only for Antenna Diversity)
148 bits
RX
TX
DS96WRL0800
Zilog