PIC16LF84A-04I/SS【PDF 46/80 页】IC MCU FLASH 1KX14 EE 20SSOP

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Sheet目录3833

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Micrel, Inc.

KSZ8851SNL/SNLI

August 2009

M9999-083109-2.0

Bit

Default Value

R/W

Description

0x0

RXME Receive Multicast Enable

When this bit is set, the RX module receives all the multicast frames (including broadcast

frames).

0x0

RXUE Receive Unicast Enable

When this bit is set, the RX module receives unicast frames that match the 48-bit Station

MAC address of the module.

0x0

RXAE Receive All Enable

When this bit is set, the KSZ8851SNL receives all incoming frames, regardless of the

frame’s destination address (see Address Filtering Scheme in Table 3 for detail).

0x0

Reserved

0x0

Reserved

0x0

RXINVF Receive Inverse Filtering

When this bit is set, the KSZ8851SNL receives function with address check operation in

inverse filtering mode (see Address Filtering Scheme in Table 3 for detail).

0x0

RXE Receive Enable

When this bit is set, the RX block is enabled and placed in a running state.

When this bit is cleared, the receive process is placed in the stopped state upon

completing reception of the current frame.

Receive Control Register 2 (0x76 – 0x77): RXCR2

This register holds control information programmed by the CPU to control the receive function.

Bit

Default Value

R/W

Description

15-8

Reserved

7-5

0x0

SRDBL SPI Receive Data Burst Length

These three bits are used to define for SPI receive data burst length during DMA

operation from the host CPU to access RXQ frame buffer.

000: 4 Bytes data burst

001: 8 Bytes data burst

010: 16 Bytes data burst

011: 32 Bytes data burst

100: Single frame data burst

101-111: NA (reserved)

Note: It needs RXQ FIFO Read command byte before each data burst.

0x0

IUFFP IPV4/IPV6/UDP Fragment Frame Pass

When this bit is set, the KSZ8851SNL will pass the checksum check at receive side for

IPv4/IPv6 UDP frame with fragment extension header.

When this bit is cleared, the KSZ8851SNL will perform checksum operation based on

configuration and doesn’t care whether it’s a fragment frame or not.

0x0

RXIUFCEZ Receive IPV4/IPV6/UDP Frame Checksum Equal Zero

When this bit is set, the KSZ8851SNL will pass the filtering for Ipv4/IPV6 UDP frame with

UDP checksum equal to zero.

When this bit is cleared, the KSZ8851SNL will drop IPV4/IPV6 UDP packet with UDP

checksum equal to zero.

0x1

UDPLFE UDP Lite Frame Enable

When this bit is set, the KSZ8851SNL will check the checksum at receive side and

generate the checksum at transmit side for UDP Lite frame.

When this bit is cleared, the KSZ8851SNL will pass the checksum check at receive side

and skip the checksum generation at transmit side for UDP Lite frame.

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