DP83821 datasheet(61/86 Pages) NSC

61 / 86 page

4.0 Register Set (Continued)

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Figure 4-1 Pattern Buffer Memory -100h words (word=18bits)

Example: Pattern match on the following destination

addresses:

02-00-03-01-04-02

match 6 bytes

12-10-13-11-14-12

match 4 bytes

22-20-23-21-24-22

match 6 bytes

32-30-33-31-34-32

match 4 bytes

RFCR = (IO base + 48h)

RFDR = (IO base + 4Ch))

# write counts

iowrite l RFCR (0006)

# pattern count registers 1, 0

iowrite l RFDR (0406)

# count 1 = 4, count 0= 6

iowrite l RFCR (0008)

# pattern count registers 3, 2

iowrite l RFDR (0406)

# count 3 = 4, count 2 = 6

# write data pattern into buffer 0

iowrite l RFCR (200)

iowrite l RFDR (0002)

iowrite l RFCR (202)

iowrite l RFDR (0103)

iowrite l RFCR (204)

iowrite l RFDR (0204)

# write data pattern into buffer 1

iowrite l RFCR (280)

iowrite l RFDR (1012)

iowrite l RFCR (282)

iowrite l RFDR (1113)

iowrite l RFCR (284)

iowrite l RFDR (1214)

# write data pattern into buffer 2

iowrite l RFCR (300)

iowrite l RFDR (2022)

iowrite l RFCR (302)

iowrite l RFDR (2123)

iowrite l RFCR (304)

iowrite l RFDR (2224)

# write data pattern into buffer 3

iowrite l RFCR (380)

iowrite l RFDR (3032)

iowrite l RFCR (382)

iowrite l RFDR (3133)

iowrite l RFCR (384)

iowrite l RFDR (3234)

#enable receive filter on all patterns

iowrite l RFCR (RFEN | APAT3 | APAT2 | APAT1 | APAT0)

Example of how to mask out a byte in a pattern:

# write data pattern into buffer 0

iowrite l RFCR (200)

iowrite l RFDR (10002) #mask byte 0 (value = 02)

iowrite l RFCR (202)

iowrite l RFDR (20103) #mask byte 1 (value = 01)

iowrite l RFCR (204)

iowrite l RFDR (30204) #mask byte 0 and 1

Pattern 3 Word 3Fh

byte 127

byte126

3FEh

Pattern 3 Word 0

byte 1

byte 0

380h

Pattern 2 Word 3Fh

byte 127

byte126

37Fh

Pattern 2 Word 0

byte 1

byte 0

300h

Pattern 1 Word 3Fh

byte 127

byte 126

2FEh

Pattern 1 Word 0

byte 1

byte 0

280h

Pattern 0 Word 3Fh

byte 127

byte 126

27Eh

Pattern 0 Word 1

byte 3

byte 2

202h

Pattern 0 Word 0

byte 1

byte 0

200h

Bit#

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