M69000 Asiliant Technologies, M69000 Datasheet - Page 178
M69000
Manufacturer Part Number
M69000
Description
Manufacturer
Asiliant Technologies
Datasheet
1.M69000.pdf
(360 pages)
Specifications of M69000
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XR0B
read/write at I/O address 3D7h with index at I/O address 3D6h set to 0Bh
7-4
3
2
Note:
1
0
&+,36
7
Reserved
These bits always return the value of 0 when read.
Font Expansion PCI Burst Write Buffer Depth
0: The buffer used to receive PCI burst writes is always 4 or 8 doublewords deep as selected by
bit 2 of this register, regardless of whether or not font expansion is being used. This is the default
after a reset.
1: The buffer used to receive PCI burst writes is limited to being 1 doubleword deep when the font
expansion feature is being used.
PCI Burst Write Buffer Depth
0: The buffer used to receive PCI burst writes is set to be 8 doublewords deep.
1: The buffer used to receive PCI burst writes is set to be 4 doublewords deep.
The use of this bit to choose the depth of the PCI burst write buffer can be overridden by bit 3 of this
register.
Reserved
This bit always returns the value of 0 when read.
PCI Burst Write Support Enable
0: Disables support for receiving PCI burst write cycles.
1: Enables support for receiving PCI burst write cycles.
69000 Databook
PCI Burst Write Support Register
6
Reserved
(0000)
5
Subject to Change Without Notice
Extension Registers
4
Font Exp Burst
Write Depth
(0)
3
Write Depth
PCI Burst
(0)
2
Reserved
(0)
Revision 1.3 8/31/98
1
Burst Write
Enable
(0)
0
14-11
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