- 21 -
© Andigilog, Inc. 2006
www.andigilog.com
October 2006 - 70A06010
aSC7621
Register 36h: PECI Configuration
Register
Address
Read/
Write
Register
Name
Bit 7
(MSB)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSB)
Default
Value
Lock
36h
R/W
PECI
Configuration
RES
RES
RES
LEG
DOM
AVG2
AVG1
AVG0
00h
X
This register establishes legacy diode register assignment condition of Temperature Zones 1 and 4, LEG; the number of
domains per client, DOM; and PECI input filter coefficients, AVG[2:0]. This register becomes read-only when the
Ready/Lock/Start/Override register Lock bit is set. Any further attempts to write to this register shall have no effect.
Bit
Field
Value
Function
000 (default)
0 Sec. (no Smoothing)
001
0.25 Sec.
010
0.5 Sec.
011
1.0 Sec.
100
2.0 Sec.
101
4.0 Sec.
110
8.0 Sec.
2:0
AVG (PECI
Input Filter)
111
0 Sec.
0 (default)
Processor contains a single domain (0)
3
DOM
1
Processor contains two domains (0,1)
0 (default)
(Standard
Mode)
Remote Diode 1 reading is associated with
Temperature Zone 1, PECI is associated with
Zone 4
4
LEG
1
(Legacy Mode)
PECI is associated with Temperature Zone
1, Remote Diode 1 is associated with Zone 4
5:7
Reserved
0
Reserved
Table 8 PECI Configuration [36h]
Register 0Eh: PECI Extended Configuration
Register
Address
Read/
Write
Register
Name
Bit 7
(MSB)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSB)
Default
Value
Lock
0Eh
R/W
PECI
Extended
Configuration
Four
Domain
Enable
Diode
Filter2
Diode
Filter1
Diode
Filter0
Proc 3
Enable
Proc 2
Enable
Proc 1
Enable
Proc 0
Enable
21
X
This register establishes the number of domains per PECI address and enables up to four PECI clients to be polled for
temperatures. If bit-0 through bit-3 are reset, PECI will not be available.
In addition, a remote diode noise filter may be tuned for optimum performance when excessive noise is present in remote
diode readings. This is a low-pass filter that also eliminates single sample spikes before they are stored in Temperature
Zone registers. Filter algorithm is described in the section on Spike Smoothing registers 62h, 63h and 3Ch. Times indicated
in Table 9 show the approximate filter response time to a step function in temperature diode measurement as applied to the
assigned Temperature Zone reading. This register becomes read-only when the Ready/Lock/Start/Override register Lock bit
is set. Any further attempts to write to this register shall have no effect.
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