Lenovo ThinkPad 560X TP 560Z Technical Reference Manual - Page 46

System Control Port B (X'0061'), Bit 7, ThinkPad 560Z System Board

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System Control Port B (X'0061') Bit definitions for the write and read functions of this port are shown in the following figures: Bit Function 7-4 Reserved 3 Reserved (should be 0) 2 Enable parity check 1 Enable speaker data 0 Timer 2 gate to speaker Figure 2-30. System Control Port B (X'0061', Write) Bit Function 7 Parity check 6 Channel check 5 Timer 2 output 4 Toggles with each refresh request 3 Reserved 2 Enable parity check 1 Enable speaker data 0 Timer 2 gate to speaker Figure 2-31. System Control Port B (X'0061', Read) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 If set to 1, this bit indicates that the PCI system error (SERR#) was pulsed active. If set to 1, this bit indicates a channel check has occurred. If read, this bit indicates the condition of the timer/counter 2 'output' signal. If read, this bit toggles for each refresh request. Reserved. If set to 0, this bit enables the PCI system error (SERR#). This bit is set to 1 during a power-on reset. If set to 1, this bit enables the speaker data. If set to 1, this bit enables the timer 2 gate. 2-28 ThinkPad 560Z System Board

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System Control Port B (X
'
0061
'
)
Bit definitions for the write and read functions of this port are shown
in the following figures:
Figure
2-30.
System Control Port B (X
'
0061
'
, Write)
Bit
Function
7–4
Reserved
3
Reserved (should be 0)
2
Enable parity check
1
Enable speaker data
0
Timer 2 gate to speaker
Figure
2-31.
System Control Port B (X
'
0061
'
, Read)
Bit
Function
7
Parity check
6
Channel check
5
Timer 2 output
4
Toggles with each refresh request
3
Reserved
2
Enable parity check
1
Enable speaker data
0
Timer 2 gate to speaker
Bit 7
If set to 1, this bit indicates that the PCI system error
(SERR#) was pulsed active.
Bit 6
If set to 1, this bit indicates a channel check has
occurred.
Bit 5
If read, this bit indicates the condition of the timer/counter
2 ‘output’ signal.
Bit 4
If read, this bit toggles for each refresh request.
Bit 3
Reserved.
Bit 2
If set to 0, this bit enables the PCI system error (SERR#).
This bit is set to 1 during a power-on reset.
Bit 1
If set to 1, this bit enables the speaker data.
Bit 0
If set to 1, this bit enables the timer 2 gate.
2-28
ThinkPad 560Z System Board