
SMSC DS – LPC47M192 
Page 188 
Rev. 03/30/05 
DATASHEET 
NAME/DEFAULT 
REGISTER 
OFFSET 
(hex) 
47 
Bits[6:0] are 
Read Only; 
Bit[7] is (R/W) 
DESCRIPTION 
VID Register 
Default: 
Bits[7:4]=0000 
Bits[3:0]=VID3-
VID0 on HVCC 
POR 
Initialization 
and 
Bits[3:0] VID[3:0] 
The VID[3:0] inputs from Pentium/PRO power supplies to indicate 
the operating voltage (e.g. 1.5V to 2.9V). 
Bits[6:4] Reserved 
Bit[7] RESET# Enable 
0= Enables A0 pin for lowest order programmable bit of SMBus 
address (Default) 
1= Enables the RESET# pin output function 
Bit[0] VID 4 
VID 4 Input (If selected). 
Bits[6:1] Reserved  
Bit[7] Reserved1 
VID4 Register 
Default: 
Bits[7]=1, 
Bits[6:1]=0 
Bit[0]=VID4 
HVCC POR and 
Initialization 
Test 
Register 
Default = 0x00 
on HVCC POR 
and Initialization 
on 
49 
(R) 
Mode 
4A 
(R/W) 
Bit[0] selects the ADC test mode. The default for this bit is zero, 
which deactivates ADC test mode. 
Bit[1] selects the digital test mode. The default for this bit is zero, 
which deactivates digital test mode. 
Bit[2] selects the external clock test mode. The default for this bit 
is zero, which deactivates external oscillator clock test mode. 
Bit[3] selects either 8 or 1 averaging for the ADC test mode. The 
default for this bit is zero, which sets the averaging to 8 for the 
ADC test mode. A one in this bit selects no averaging. 
Bit[4] selects the oscillator clock to be muxed out on the VID2 pin. 
The default for this bit is zero, which deactivates mux oscillator 
clock test mode. 
Bits[7:5] are used by the analog block for test purposes. These 
three 
bits 
of 
register 
4Ah 
dig_test_an_pad[2:0]. These bits are also used to mux out either 
the SDA line or the SCLK line to the VID3 pin. If bits[7:5] are ‘001’, 
then the SDA line is muxed out onto the VID3 pin. If bits[7:5] are 
‘010’, then the SCLK line is muxed out onto the VID3 pin. 
Bit[0] indicates that no NACK was generated by the host during 
either a read byte protocol or a receive byte protocol. 
Bit[1] indicates a read or a write was attempted to an invalid 
register location. 
Bit[2] indicates a write to a read only register was attempted 
Bit[3] indicates a receive byte protocol was attempted when the 
address pointer register pointed to the 00h location. This is the 
default register location on power on reset. As noted in the “Bus 
Protocols” section of the “Hardware Monitoring Interface” section, 
the Internal Address register should be set up with a valid address 
location by either a send byte protocol or a write byte protocol 
after power-on-reset, before the receive byte protocol. 
Bit[4] indicates an invalid slave address was detected. 
Bit[5] indicates a premature stop was detected. 
Bit[6] indicates an error was detected during the SMBus Receive 
Byte Protocol Response to an ARA. 
Bit[7] is reserved. 
are 
muxed 
out 
on 
pins 
Error 
Register 
Default = 0x00 
on HVCC POR 
and Initialization 
Debug 
4B 
(R)