M69030 Asiliant Technologies, M69030 Datasheet - Page 193

• 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

XR20
read/write at I/O address 3D7h with index at I/O address 3D6h set to 20h
shared by both pipelines A and B
7-6
5-4
3-2
1
0
`efmp
A
&
B

Reserved
BitBLT Engine Color Depth
Reserved (Writable)
BitBLT Reset
BitBLT Engine Status
69030 Databook
7
Reserved
BitBLT Configuration Register
(00)
These bits always have the value of 0 when read.
When bit 23 of the BitBLT Control Register (BR04) is set to 0, these two bits configure the
BitBLT engine for one of three possible color depths. If bit 23 of the BitBLT Control Register
(BR04) is set to 1, then this function is performed by bits 25 and 24 of that same register.
It is strongly recommended that the color depth of the BitBLT engine be set to match the
color depth to which the graphics system has been set whenever possible.
The choice of color depth configures the BitBLT engine to work with one, two or three bytes
per pixel. This directly affects the number of bytes of graphics data that the BitBLT engine
will read and write for a given number of pixels. In the case of monochrome source or
pattern data, this setting directly affects the color depth into which such monochrome data
will be converted during the color expansion process.
If the graphics system has been set to a color depth that is not supported by the BitBLT
engine, then it is strongly recommended that the BitBLT engine not be used. See appendix
B for more information.
These bits should always be written to with the value of 0.
0: Writing a value of 0 to this bit permits normal operation of the BitBLT engine. This is the
default value after reset.
1: Writing a value of 1 to this bit resets the BitBLT engine.
0: Indicates that the BitBLT engine is idle. This is the default after reset.
1: Indicates that the BitBLT engine is busy.
Bits
5 4
0 0
0 1
1 0
1 1
6
BitBLT Engine Color Depth Selected
8 bits per pixel (1 byte per pixel) -- This is the default after reset.
16 bits per pixel (2 bytes per pixel)
24 bits per pixel (3 bytes per pixel)
Reserved
5
BitBLT Engine
Color Depth
(00)
Extension Registers
4
Reserved (Writable)
3
(00)
2
BitBLT
Revision 1.3 11/24/99
Reset
(0)
1
BitBLT
Status
(0)
0
14-13