402-00005-00
Registers
3–18
Rev 02; February 8, 2002
3.2.2 Bus Master Destination Address (BMDST) R-O
0
7
BADR0 + 0x24
ADR7
ADR6
ADR5
ADR4
ADR3
ADR2
ADR1
ADR0
8
15
ADR15
ADR14
ADR13
ADR12
ADR11
ADR10
ADR9
ADR8
BMDST
16
23
ADR23
ADR22
ADR21
ADR20
ADR19
ADR18
ADR17
ADR16
24
31
ADR31
ADR30
ADR29
ADR28
ADR27
ADR26
ADR25
ADR24
This register indicates the status of the PCI destination address for data moving from the image memory to the PCI-
bus during Bus Master write operations. This register is continually updated during the transfer process and will
always point to the next unwritten location. Reading this register during the transfer process (a read causes the trans-
fer to halt and the PCI interface to operate in target mode) is permitted and may be used to monitor the progress of the
transfer. This register is read only.
The real destination address is loaded in the scatter gather table. The destination address must be on DWORD
(32-bit) boundaries to allow the PCVisionplus to send data anywhere within the defined PCI address range (ADR1
and ADR0 must be zero). The two lsbs (least significant bits) will be zero during the address phase of a bus master
write transfer indicating to the target that the data from the PCVisionplus is in linear format and that the PCVision-
plus is burst capable (therefore the target should not arbitrarily disconnect after the first data transfer).
3.2.3 Bus Master Transfer Count (BMXC) R-O
0
7
BADR0 + 0x28
BMXC7
BMXC6
BMXC5
BMXC4
BMXC3
BMXC2
BMXC1
BMXC0
8
15
BMXC15
BMXC14
BMXC13
BMXC12
BMXC11
BMXC10
BMXC9
BMXC8
BMXC
16
23
Reserved
Reserved
BMXC21
BMXC20
BMXC19
BMXC18
BMXC17
BMXC16
24
31
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
This register indicates the status of the transfer count during a bus master transfer. This register is continually up-
dated during the transfer operation. The value in this register decrements with each byte written during the bus mas-
ter operation until the count reaches zero. Upon reaching zero, the write transfer operation ceases An end-of-transfer
interrupt can be generated to the PCI bus interface.
The actual transfer count is loaded in the scatter gather table. The transfer count must be on DWORD (32-bit) bound-
aries to allow the PCVisionplus to send data anywhere within the defined PCI address range.
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