LAN83C185_03 Datasheet, PDF (53/65 Pages) SMSC Corporation – High Performance Single Chip Low Power 10/100 Ethernet Physical Layer Transceiver

High Performance Single Chip Low Power 10/100 Ethernet Physical Layer Transceiver (PHY)
Datasheet
5.6
DSP Block
5.6.1
5.6.2
General Description
The “DSP Block” includes the following modules:
DSP Core (Equalizer, Timing and BLW correction), Testability / Configuration module (Testability /
Configuration control), Testability / Configuration Registers (not including any SMI registers) and the
Multiplexers (for the testability / configuration signals).
The details of the DSP core are described in the DSP architecture specification. The Testability /
Configuration features give access to the status and control of most of the internal registers in the DSP.
The status and control mechanisms are described in the architecture specification.
ADC Gray code converting
The LAN83C185 ADC generates a 6 bit “modified” Gray code. Normal Gray code outputs number in
the range of 0 to 2ⁿ – 1. The 6-bit code generates numbers from 0 to 63 (decimal).
The MLT3 analog input has a voltage range of –1V to +1V. It is necessary to translate this to -32 to
+31 on the output of the ADC. Thus the Gray Code is modified by offsetting it by -32. This is translated
to 2’s complement before being presented to the DSP.
SMSC LAN83C185
45
DATASHEET
Rev. 0.6 (12-12-03)