EZ80F91MCU ZILOG [Zilog, Inc.], EZ80F91MCU Datasheet - Page 271

• Manufacturer Part Number: EZ80F91MCU
• Description: eZ80Acclaim-TM Flash Microcontrollers
• Manufacturer: ZILOG [Zilog, Inc.]

Table 138. CRC/PAD Features of EMAC Configuration Register
PS019209-0504
ADPADN
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
VLPADN
Table 138 shows the results of different settings for bits [7:4} of EMAC Configura-
tion Register 1.
Bit
Position
0
DCRCC
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
Value
0
1
CRCEN Result
0
1
0
1
0
1
0
1
0
1
0
1
0
1
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.
P R E L I M I N A R Y
No pad or CRC appended.
CRC appended.
Pad to 60 bytes if necessary; append CRC (min. size =
64).
Pad to 60 bytes if necessary; append CRC (min. size =
64).
No pad or CRC appended.
CRC appended.
Pad to 64 bytes if necessary, append CRC (min. size =
68).
Pad to 64 bytes if necessary, append CRC (min. size =
68).
No pad or CRC appended.
CRC appended.
If VLAN not detected, pad to 60, add CRC.
If VLAN detected, pad to 64, add CRC.
If VLAN not detected, pad to 60, add CRC.
If VLAN detected, pad to 64, add CRC.
No pad or CRC appended.
CRC appended.
If VLAN not detected, pad to 60, add CRC.
If VLAN detected, pad to 64, add CRC.
If VLAN not detected, pad to 60, add CRC.
If VLAN detected, pad to 64, add CRC.
Ethernet Media Access Controller
Product Specification
eZ80F91 MCU
252