VT8601 Apollo ProMedia
Revision 1.3 September 8, 1999
-86
VGA Extended Registers
7HFKQRORJLHV ,QF
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Power Management Registers
GR20 – Standby Timer Control.......................................RW
7
Timer Initialize & Enable
0
Enable Timer..........................................default
1
Initialize and hold standby and DPMS timer
6-4
Timer Testing .......................................................RO
3-0
Reserved
........................................ always reads 0
GR21 – Power Management Control 1 ...........................RW
7
Power Management Pin Polarity
0
Active High ............................................default
1
Active Low
6
PCI Power Management
0
Disable ...................................................default
1Enable
5
Suspend Mode
0
Normal mode..........................................default
1
Enter Suspend Mode
4
Suspend Input Pin
0
Disable ...................................................default
1Enable
3
D3 to D0 Reset
0
Disable ...................................................default
1Enable
2
Standby Input Pin
0
Disable ...................................................default
1Enable
1
CLKRUN# Mechanism
0
Disable ...................................................default
1Enable
0
Consistent Standby / Suspend
0
The bits in the PCI PM configuration registers
will be OR’ed with bits 5 and 3 of this register
for connection to the internal PM state
machine ..................................................default
1
The bits in the PCI PM configuration registers
will be the same as bits 5 and 3 of this register
to allow software coherency
GR22 – Power Management Control 2........................... RW
7
Timer Test Mode
0
Disable................................................... default
1Enable
6
Refresh Clock Select
0
Crystal input or external clock (XMCLK)
provides refresh clock during suspend... default
1
REFCLK is used as refresh clock during
suspend for 64ms refresh (ignore “Suspend
DRAM Refresh Mode” bits 5-4 below)
5-4
Suspend DRAM Refresh Mode
00 No refresh .............................................. default
01 Self refresh
10 Crystal clock provides rate for 8ms refresh
11 Crystal clock provides rate for 64ms refresh
3
Disable GPIO
0
Allow GPIO 7-0 pins to drive data in .... default
1
Disable GPIO 7-0 pins (and their shared
functions) from driving data. Tristates input
buffers on pins so no power is consumed if
GPIO pins are set to input mode.
2
Reserved
........................................ always reads 0
1
Hardware / Software Oscillator Select
0
Software controls oscillator off with bit-0
(prevents
automatic
oscillator
shutdown
without
direct
software
control
of
the
“Oscillator Disable” bit) .............................. def
1
Hardware
controls
oscillator
off
(allow
oscillator shutdown when power states are
entered using hardware mechanisms)
0
Oscillator Disable
0
Enable normal function.......................... default
1
Disable (oscillator off)
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