Philips Semiconductors
Product specification
Multimedia bridge, high performance
Scaler and PCI circuit (SPCI)
SAA7146A
OFFSET
(HEX)
NAME
RW2
BIT
TYPE
DESCRIPTION
28
2
RW Specifies the data stream direction of FIFO 2. A logic 0 enables a write
operation to the PCI memory. A logic 1 enables a read operation from the
PCI memory.
Swap2
1 and 0
RW endian swapping of all Dwords passing the FIFO 2:
00 = no swap
01 = two byte swap (3210 to 2301)
10 = four byte swap (3210 to 0123)
11 = reserved
2C
NumLines2 27 to 16 RW Number of lines per field: in read mode NumLines defines the number of
lines to be read from system memory. A logic 0 specifies one line. In write
mode this register is not used.
NumBytes2 11 to 0
RW Number of bytes per line: in read mode this defines the number of bytes
per line to be read from system memory. A logic 0 specifies one byte. In
write mode this register is not used.
30
34
38
BaseOdd3
31 to 0
RW PCI base address for odd fields of the upper (or lower if top-down flip is
selected) left pixel of the transferred field
BaseEven3 31 to 0
RW PCI base address for even fields of the upper (or lower if top-down flip is
selected) left pixel of the transferred field
ProtAddr3
−
31 to 2
1 and 0
31 to 0
RW protection address
−
reserved
3C
40
Pitch3
Page3
ME3
RW distance between the start addresses of two consecutive lines of a field
31 to 12 RW base address of the page table (see Section 7.2.4)
11
RW mapping enable; this bit enables the MMU
reserved
−
10 to 8
7 to 4
−
Limit3
RW interrupt limit; defines the size of the memory range, that raise an
interrupt, if its boundaries are passed
PV3
3
2
RW protection violation handling
RW3
RW Specifies the data stream direction of FIFO 3. A logic 0 enables a write
operation to the PCI memory. A logic 1 enables a read operation from the
PCI memory.
Swap3
1 and 0
RW endian swapping of all Dwords passing the FIFO 3:
00 = no swap
01 = two byte swap (3210 to 2301)
10 = four byte swap (3210 to 0123)
11 = reserved
44
NumLines3 27 to 16 RW Number of lines per field: in read mode NumLines defines the number of
lines to be read from system memory. A logic 0 specifies one line. In write
mode it defines the number of qualified lines to be processed by the BRS
per field. This will cut off all the following input-lines at the BRS input.
NumBytes3 11 to 0
RW Number of bytes per line: in read mode this defines the number of bytes
per line to be read from system memory. A logic 0 specifies 1 byte. In write
mode it defines the number of qualified bytes to be processed by the BRS
per line. This will cut off all the following bytes at the BRS input.
1998 Apr 09
23
NXP [ NXP ]
