B69000 Asiliant Technologies, B69000 Datasheet - Page 214

• Manufacturer Part Number: B69000
• Manufacturer: Asiliant Technologies

Specifications of B69000

• Lead Free Status / Rohs Status: Supplier Unconfirmed

XRD1
read/write at I/O address 3D7h with index at I/O address 3D6h set to D1h
7-1
0
Note:
XRD2
read/write at I/O address 3D7h with index at I/O address 3D6h set to D2h
7-0
&+,36
7
7
Reserved
This bit always returns the value of 0 when read.
BitBLT Engine Idle-State Powerdown
0: Does not cause the BitBLT engine to automatically powerdown when idle.
1: Causes the BitBLT engine to automatically powerdown when idle.
Use of this feature in no way affects usability of the BitBLT engine, and in no way impedes access
to the BitBLT registers. The manner in which the BitBLT engine is programmed is not affected by
the use of this feature.
2KHz Down Counter
This register provides the output of a looping 8-bit counter that is continuously decremented at a
rate of 2KHz. The 2KHz frequency is derived from the same 14.318MHz reference frequency
received from an external oscillator that is used as the base frequency for the generation of both
the dot clock and memory clock.
This register is meant to be used to provide a fixed time base that can be used by CHIPS’ BIOS to
properly time the various steps to perform a powerdown or powerup of the graphics controller.
69000 Databook
Power Conservation Control Register
2KHz Down Counter Register
6
6
5
5
Subject to Change Without Notice
(0000:000)
Reserved
Extension Registers
32KHz Down Counter
4
4
(00h)
3
3
2
2
Revision 1.3 8/31/98
1
1
Powerdown
BitBLT Idle
(0)
0
0
14-47