M69030 Asiliant Technologies, M69030 Datasheet - Page 191

• Manufacturer Part Number: M69030
• Manufacturer: Asiliant Technologies

Specifications of M69030

• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Operating Temperature (max): 70C
• Rad Hardened: No
• Lead Free Status / Rohs Status: Supplier Unconfirmed

XR0B
read/write at I/O address 3D7h with index at I/O address 3D6h set to 0Bh
shared by both pipelines A and B
7-4
3
2
1
0
`efmp
A
&
B

Reserved
Font Expansion PCI Burst Write Buffer Depth
PCI Burst Write Buffer Depth
Reserved
PCI Burst Write Support Enable
69030 Databook
7
PCI Burst Write Support Register
These bits always return the value of 0 when read.
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.
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.
Note: The use of this bit to choose the depth of the PCI burst write buffer can be overridden
by bit 3 of this register.
This bit always returns the value of 0 when read.
0: Disables support for receiving PCI burst write cycles.
1: Enables support for receiving PCI burst write cycles.
6
Reserved
(0000)
5
Extension Registers
4
Burst Write
Font Exp
Depth
(0)
3
Write Depth
PCI Burst
(0)
2
Reserved
Revision 1.3 11/24/99
(0)
1
Burst Write
Enable
(0)
0
14-11