B69000 Asiliant Technologies, B69000 Datasheet - Page 200

• Manufacturer Part Number: B69000
• Manufacturer: Asiliant Technologies

Specifications of B69000

• Lead Free Status / Rohs Status: Supplier Unconfirmed

XRA9
read/write at I/O address 3D7h with index at I/O address 3D6h set to A9h
7-0
XRAA
read/write at I/O Address 3D7h with index at I/O address 3D6h set to AAh
7-4
3-0
&+,36
7
7
Cursor 2 Vertical Extension
When the vertical extension feature for cursor 2 is enabled by setting bit 3 of the Cursor 2 Control
Register (XRA8) to 1, these 8 bits of this register are used to specify the height of cursor 2 in scan
lines. The number of scan lines must be a multiple of four.
This register should be programmed with a value derived from the following equation:
Cursor 2 Base Address Bits 15-12
These four bits provide part of a 22-bit value that specifies the offset from the beginning of the frame
buffer memory space where the 4KB cursor data space for cursor 2 is to be located. The six most-
significant bits of this 22-bit value are supplied by the Cursor 2 Base Address High Register (XRAB).
Cursor 2 Pattern Select
These four bits allow 1 of up to as many as 16 possible patterns contained in the cursor data space
for cursor 2 to be selected to be displayed.
The actual number of patterns depends on the size of each pattern, since the cursor data space is
limited to a total of 4KB in size. The size of each pattern depends, at least in part, on the choice of
cursor mode. See the section on the hardware cursor and popup for more details concerning the
cursor modes.
69000 Databook
Cursor 2 Base Address Bits 15-12
Cursor 2 Vertical Extension Register
Cursor 2 Base Address Low Register
value = ((number of scanlines)
6
6
(0000)
5
5
Subject to Change Without Notice
Cursor 2 Vertical Extension
Extension Registers
4
4
( 4) - 1
(00h)
3
3
Cursor 2 Pattern Select
2
2
(0000)
Revision 1.3 8/31/98
1
1
0
0
14-33