PIC16F76-E/ML【PDF 65/104 页】IC PIC MCU FLASH 8KX14 28QFN

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Sheet目录3874

61页 62页 63页 64页 [65页]66页 67页 68页 69页

Micrel, Inc.

KSZ8851-16MLLJ

March 2010

M9999-030210-1.0

Transmit Control Register (0x70 – 0x71): TXCR

This register holds control information programmed by the CPU to control the QMU transmit module function.

Bit

Default Value

R/W

Description

15-9

Reserved.

0x0

TCGICMP Transmit Checksum Generation for ICMP

When this bit is set, The KSZ8851-16MLLJ is enabled to transmit ICMP frame (only for

non-fragment frame) checksum generation.

0x0

Reserved.

0x0

TCGTCP Transmit Checksum Generation for TCP

When this bit is set, The KSZ8851-16MLLJ is enabled to transmit TCP frame

checksum generation.

0x0

TCGIP Transmit Checksum Generation for IP

When this bit is set, The KSZ8851-16MLLJ is enabled to transmit IP header checksum

generation.

0x0

FTXQ Flush Transmit Queue

When this bit is set, The transmit queue memory is cleared and TX frame pointer is

reset.

Note: Disable the TXE transmit enable bit[0] first before set this bit, then clear this bit

to normal operation.

0x0

TXFCE Transmit Flow Control Enable

When this bit is set and the KSZ8851-16MLLJ is in full-duplex mode, flow control is

enabled. The KSZ8851-16MLLJ transmits a PAUSE frame when the Receive Buffer

capacity reaches a threshold level that will cause the buffer to overflow.

When this bit is set and the KSZ8851-16MLLJ is in half-duplex mode, back-pressure

flow control is enabled. When this bit is cleared, no transmit flow control is enabled.

0x0

TXPE Transmit Padding Enable

When this bit is set, the KSZ8851-16MLLJ automatically adds a padding field to a

packet shorter than 64 bytes.

Note: Setting this bit requires enabling the add CRC feature (bit1=1) to avoid CRC

errors for the transmit packet.

0x0

TXCE Transmit CRC Enable

When this bit is set, the KSZ8851-16MLLJ automatically adds a 32-bit CRC checksum

field to the end of a transmit frame.

0x0

TXE Transmit Enable

When this bit is set, the transmit module is enabled and placed in a running state.

When reset, the transmit process is placed in the stopped state after the transmission

of the current frame is completed.

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