ez80f91 ZiLOG Semiconductor, ez80f91 Datasheet - Page 315

• Manufacturer Part Number: ez80f91
• Description: Ez80 Acclaimplus!? Connectivity Assp Ez80f91 Assp
• Manufacturer: ZiLOG Semiconductor

Table 185. EMAC Configuration Register 4
PS027001-0707
Bit
Reset
CPU Access
Note: R = Read Only; R/W = Read/Write.
Bit
Position
7
6
TPCF
5
THDF
4
PARF
3
RxFC
2
TxFC
1
TPAUSE
0
RxEN
EMAC Configuration Register 4
The EMAC Configuration Register 4 controls pause control frame behavior, back
pressure, and receive frame acceptance. See
EMAC Station Address Register
The EMAC Station Address register is used for two functions. In the address recogni-
tion logic for Receive frames, EMAC_STAD_0–EMAC_STAD_5 are matched against
Value
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Description
Reserved.
Do not transmit a pause control frame.
Transmit pause control frame (FULL-DUPLEX mode). TPCF
continually sends pause control frames until negated.
Disable back pressure.
EMAC asserts back pressure on the link. Back pressure
causes preamble to be transmitted, raising carrier sense
(HALF-DUPLEX mode).
Only accept frames that meet preset criteria (that is, address,
CRC, length, etc.).
All frames are received regardless of address, CRC, length,
etc.
EMAC ignores received pause control frames.
EMAC acts upon pause control frames received.
PAUSE control frames are not allowed to be transmitted.
PAUSE control frames are allowed to be transmitted.
Do not force a pause condition.
Force a pause condition while this bit is asserted.
EMAC receiver disabled.
EMAC receiver enabled.
R
7
0
R/W
6
0
R/W
5
0
(EMAC_CFG4 = 0024h)
R/W
4
0
R/W
3
0
Table
185.
R/W
2
0
R/W
Ethernet Media Access Controller
1
0
Product Specification
R/W
0
0
eZ80F91 ASSP
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