PCVisionplus
Hardware Reference
Registers
3–79
Rev 02; February 8, 2002
3.5.11 Output Control Table (OCTDATA) R/W
0
7
BADR3 + 0x40000–0x7FFFC
ADR7
ADR6
ADR5
ADR4
ADR3
ADR2
ADR1
ADR0
8
15
ADR15
ADR14
ADR13
ADR12
ADR11
ADR10
ADR9
ADR8
OCTDATA
16
23
XCNT3
XCNT2
XCNT1
XCNT0
Reserved
ADR18
ADR17
ADR16
24
31
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
The Output Control Table (OCT) controls how data is read from the frame buffer memory.
Bit
Mnemonic
Function
0–18
ADR
Start Address
19
Reserved
“Don’t care”
20–23
XCNT
Transfer Count
24–31
Reserved
“Don’t care”
3.5.11.1 Start Address (ADR) R/W
The 19-bit start address supports image buffers up to 4MB. This address does not wrap at the 4MB size of the PCVi-
sionplus image memory. Addresses over 4MB (0x7FFFF) will attempt to address non-existing memory. The PCVi-
sionplus image memory is partitioned into 2048-byte pages. An OCT entry must access data within a single
2048-byte page. Page boundary crossing is not allowed during a bus master transfer.
ADR
Function
0
ADR = 0
1
ADR = DWORD 1
2
ADR = DWORD 2
. . .
. . .
0x7FFFC
ADR = DWORD 7FFFC, or 4MB – 1 DWORD
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