MN5572 Datasheet, PDF (12/28 Pages) Panasonic Semiconductor – Gray Scale Font Engine

MN5572
I Functional Description (continued)
2. Memory register functions (continued)
2.6 FIFO register (continued)
Readable register that indicates the state of the MN5572 POINT and RASTER FIFOs.
This is a 16-bit register. Only the low-order 16 bits of the data bus are used.
bit 15
12 11
87
43
0
PRBANK
PWBANK
RRBANK
RWBANK
• The 4 bits in PRBANK and PWBANK indicate the status for bank 0 to bank 3 of the POINT FIFO.
When a given bit in PRBANK is 1, the data in the corresponding bank has not been read out.
When a given bit in PWBANK is 1, the data for the corresponding bank can be written.
• The 4 bits in RRBANK and RWBANK indicate the status for bank 0 to bank 3 of the RASTER FIFO.
When a given bit in RRBANK is 1, the data in the corresponding bank can be read out.
When a given bit in RWBANK is 1, the data in the corresponding bank has not been written.
3. Input data format
This section describes the format of the path (outline) data accepted by the MN5572.
• Overall structure
32 bit
Header data
Path data
Footer data
• Header data structure
bit 31 30 28 27 26 25 24 23
16 15
87
0
0 tag eof vth bpp
max. cov
bbox. x
bbox. y
• Path data structure
bit 31 30 28 27
14 13
0
0 tag
vect. x
vect. y
• Footer data structure
bit 31 30 28 27
0
0 tag 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
12
SDF00008BEM