EZ80F91MCU Datasheet, PDF (271/396 Pages) Zilog, Inc. – eZ80Acclaim-TM Flash Microcontrollers

eZ80F91 MCU
Product Specification
252
Bit
Position
0
DCRCC
Value
0
1
Description
No proprietary header. Normal operation.
Four bytes of proprietary header (ignored by CRC) exists on
the front of IEEE 802.3 frames.
Table 138 shows the results of different settings for bits [7:4} of EMAC Configura-
tion Register 1.
Table 138. CRC/PAD Features of EMAC Configuration Register
ADPADN
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
VLPADN
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
PADEN
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
CRCEN Result
0 No pad or CRC appended.
1 CRC appended.
0 Pad to 60 bytes if necessary; append CRC (min. size =
64).
1 Pad to 60 bytes if necessary; append CRC (min. size =
64).
0 No pad or CRC appended.
1 CRC appended.
0 Pad to 64 bytes if necessary, append CRC (min. size =
68).
1 Pad to 64 bytes if necessary, append CRC (min. size =
68).
0 No pad or CRC appended.
1 CRC appended.
0 If VLAN not detected, pad to 60, add CRC.
If VLAN detected, pad to 64, add CRC.
1 If VLAN not detected, pad to 60, add CRC.
If VLAN detected, pad to 64, add CRC.
0 No pad or CRC appended.
1 CRC appended.
0 If VLAN not detected, pad to 60, add CRC.
If VLAN detected, pad to 64, add CRC.
1 If VLAN not detected, pad to 60, add CRC.
If VLAN detected, pad to 64, add CRC.
PS019209-0504
PRELIMINARY
Ethernet Media Access Controller