PCVisionplus
Hardware Reference
Registers
3–63
Rev 02; February 8, 2002
3.5 FRAME BUFFER CONTROL REGISTERS
These registers control data acquisition into the frame buffer memory. This 1MB group of addresses is organized into
four 64K DWORD areas: Frame Control registers, Output Control Table, Scatter Gather (or DMA) Table, AMCC
Add-on registers. The Frame Buffer Control registers are mapped into system address space starting at the address in
the BADR3 register. Figure 3–12 shows the register map for the Frame Buffer Control registers.
Interrupt Status (INTSTAT)
Acquire Interrupt Line (ACQLINEINT)
Page #
0x1C
0x20
Segment Size (SGSZ)
0x24
0x28
0x2C
0x30–0x3FFFF
OCT Start Address (OCTSTART)
Reserved
Interrupt Control (INTENREG)
BADR3 +
3–74
3–75
3–77
3–79
Acquisition Start Address (ACQSTRT)
0x18
3–72
Reserved
0xC0010–0xFFFFF
3–71
3–81
3–73
0x14
Memory Initialization (MEMINIT)
0x0C
Reserved
0x04
0x08
Reserved
Reserved
0x00
Acquisition Control (ACQREG)
3–64
0x10
Bus Master Control (BMCTLX)
3–68
3–75
Manual Transfer Count (MXCNT)
0xC0008
0xC000C
Add-On General Control (AGCSTS)
Manual Destination Address (MDSTADR)
0xC0004
Add-On Interrupt Control (AINT)
3–83
3–84
3–82
0xC0000
3–83
0x40000–
0x7FFFF
0x80000–
0xBFFFF
Scatter Gather Table
Output Control Table
Acquire Address (ACQADR)
0x30
3–78
Figure 3–12. Frame Buffer Control Register Map
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