cp2200 Silicon Laboratories, cp2200 Datasheet - Page 51

• Manufacturer Part Number: cp2200
• Description: Single-chip Ethernet Controller
• Manufacturer: Silicon Laboratories

Bit 7:
Bit 6:
Bit 5:
Bit 4:
Bit 3:
Bit 2:
Bit 1:
Bit 0:
Bits 7–1: UNUSED. Read = 0000000b, Write = don’t care.
Bit 0:
OVRRIDE
R/W
Bit7
Bit7
—
R
OVRRIDE: Default Override
0: Settings for bits 5, 4, 3, 2, and 1 in TXCN will be ignored. MAC settings will take effect.
1: Settings for bits 5, 4, 3, 2, and 1 in TXCN will be applied. MAC settings will be overridden.
UNUSED. Read = 0b, Write = don’t care.
CRCENOV: CRC Enable
0: Disable CRC append on transmission.
1: Enable CRC append on transmission.
PADENOV: Pad Enable
0: Disable padding of short frames.
1: Enable padding of short frames.
TXPPKT: Transmit a PAUSE control packet
0: Normal packet transmission. Packet data will be obtained from the transmit buffer.
1: A PAUSE control packet with the value of TXPAUSEH:TXPAUSEL will be transmitted. Data in the
transmit buffer will not be accessed. PAUSE control packets are only valid in full-duplex mode.
BCKPRES: Apply Back Pressure
0: Normal packet transmission. Back pressure will not be applied.
1: Back pressure will be applied on transmission (only valid in half duplex mode).
FDPLXOV: Full Duplex Operation
Note: The transmit interface, MAC, and physical layer must be configured to the same duplex mode.
0: Transmit interface operates in half duplex mode.
1: Transmit interface operates in full duplex mode.
TXGO: Transmit Packet
Set this bit to ‘1’ to begin transmission of a packet.
Note: TXGO should not be set to one if both TXSTART and TXEND are zero (i.e., no data has been
added to the buffer).
TXBUSY: Packet Transmit Status
0: Packet Transmit is not in progress.
1: Packet Transmit is in progress.
R/W
Bit6
Bit6
—
—
R
CRCENOV PADENOV TXPPKT BCKPRES FDPLXOV
Register 19. TXBUSY: Transmit Busy Indicator
Register 18. TXCN: Transmit Control Register
Bit5
R/W
Bit5
—
R
Bit4
—
R
R/W
Bit4
Bit3
—
R
Rev. 1.0
R/W
Bit3
Bit2
—
R
R/W
Bit2
Bit1
—
R
R/W
Bit1
TXBUSY 00000000
Bit0
TXGO
R
Bit0
W
CP2200/1
Reset Value
Address:
00000000
Reset Value
0x54
Address:
0x53
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