Z87001 Datasheet, PDF (34/51 Pages) Zilog, Inc. – ROMless Spread Spectrum Cordless Phone Controller

Z87001/Z87L01
ROMless Spread Spectrum Cordless Phone Controller
Zilog
REGISTER DESCRIPTION (Continued)
The bank is selectable in software by writing to the core’s each of the eight external registers (EXT0 through EXT7)
status register (see Table 24). Once a bank is selected, can be accessed by a single-cycle software instruction.
Bank
Bank 0
Bank 1
Bank 2
Bank 3
Table 11. Bank Switching
Status Register
xxxx xxxx x00x xxxx b
xxxx xxxx x01x xxxx b
xxxx xxxx x10x xxxx b
xxxx xxxx x11x xxxx b
Bank Function
Test point access, TDD switching control
Rate buffer access, miscellaneous
ADPCM processor interface, RF interface, etc.
Configuration, status, general-purpose port data and direction
Bank 3 Registers
Table 12. Bank 3 Registers
Config 1
Field
Bank 3
Bit Position
EXT0
R/W Data Description
RESERVED
f--------------- R
W
Returns 0
Must be set to 1
VP_CLOCK
-e--------------
Controls CLKOUT output pin (clock for ADPCM Processor).
Returns 0
0 CLOCKOUT=16.384 MHz
1 CLOCKOUT = 8.192
USE_CORE_BIAS --d-------------
R
W
Controls which bias value is used by the downconverter’s
NCO as part of the automatic frequency control loop (AFC)
Returns 0
0* Uses BIAS_ERROR_DATA value from AFC hardware
1 Uses CORE_BIAS_DATA value from DSP core
SYLE_POLARITY ---c------------
R
W
Controls the polarity of the SYLE output pin (hop pulse)
Returns 0
0 SYLE is a positive pulse
1 SYLE is a negative pulse
WINDOW_SIZE
----ba98--------
Defines the search window size (in bits) for windowed search
mode (for Unique Word or SYNC_D words).
R
Returns 0
W 0000 Window size=1
0001 Window size =3 (1±1)
•••
1111 Window size = 31 (1± 15)
BIAS_THRESHOL -------76543210
D
Bias estimator threshold value
R
Returns 0
W XXh Sets the bias value
Notes:
1. VP_CLOCK. Internally synchronized to avoid glitches. Changes to this bit take effect immediately.
2. SYLE_POLARITY. Changes to this bit take effect immediately.
3. BIAS_THRESHOLD. The bias threshold must be coded as a negative value
(opposite of the threshold value) coded in 2’s complement. The nominal value for the
threshold is -46 (=D3h). Internally, this value is sign-extended to 13 bits.
34
PRELIMINARY
DS96WRL0800