Z87001 Datasheet, PDF (40/51 Pages) Zilog, Inc. – ROMless Spread Spectrum Cordless Phone Controller

Z87001/Z87L01
ROMless Spread Spectrum Cordless Phone Controller
Zilog
Bank 2 Registers
VP_INOUT
Field
RESERVED
VP_STATUS
VP_COMMAND
Table 20. Bank 2 Register Description
Bank 2
Bit Position
fedcba98--------
--------76543210
--------76543210
EXT0
R/W
R
W
R
W
Data
Description
Returns 0
No effect
Access to ADPCM Processor’s Command/Status
mailbox
XXh Reads Status byte from ADPCM Processor
Access to ADPCM Processor’s Command/Status
mailbox
XXh Writes Command byte to ADPCM Processor
Table 21. Bank 2 Register Description
RX_CONTROL
Field
Bank 2
Bit Position
EXT1
R/W Data
Description
SNR_ESTIMATE
UW_LOCATION
fedcba9876543210
-------876543210
Access to channel measurement (SNR) estimate
Returns the SNR value
R XXXXh
Location of the Unique Word
W XXXXh Initializes the value that the receive frame counter
is set to on detection of the Unique Word
Notes:
SNR_ESTIMATE. This value is updated every frame. It should be read by
the software during the frequency hopping guard time of the next frame.
Table 22. Bank 2 Register Description
BIAS_ERROR
Field
Bank 2
Bit Position
EXT2
R/W Data
Description
BIAS_ERROR_DATA
fedcba9876543210
Access to the bias estimate from the AFC loop.
R XXXXh Current bias estimate value
W
No effect
Notes:
BIAS_ERROR_DATA. This value is used to bias the downconverter’s NCO if the USE_CORE_BIAS register field is reset. It is en-
coded as a 2’s complement number. The unit is 125 Hz
.
40
PRELIMINARY
DS96WRL0800