LAN9115 datasheet(75/114 Pages) MICROCHIP

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DS00002269A-page 75

LAN9115

5.3.19

RX_DROP– RECEIVER DROPPED FRAMES COUNTER

This register indicates the number of receive frames that have been dropped.

5.3.20

MAC_CSR_CMD – MAC CSR SYNCHRONIZER COMMAND REGISTER

This register is used to control the read and write operations with the MAC CSR’s

5.3.21

MAC_CSR_DATA – MAC CSR SYNCHRONIZER DATA REGISTER

This register is used in conjunction with the MAC_CSR_CMD register to perform read and write operations with the MAC

CSR’s

5.3.22

AFC_CFG – AUTOMATIC FLOW CONTROL CONFIGURATION REGISTER

This register configures the mechanism that controls both the automatic, and software-initiated transmission of pause

frames and back pressure.

Offset:

A0h

Size:

32 bits

Bits

Description

Type

Default

31-0

RX Dropped Frame Counter (RX_DFC). This counter is incremented every

time a receive frame is dropped. RX_DFC is cleared on any read of this

An interrupt can be issued when this counter passes through its halfway

point (7FFFFFFFh to 80000000h).

00000000h

Offset:

A4h

Size:

32 bits

Bits

Description

Type

Default

CSR Busy. When a 1 is written into this bit, the read or write operation is

performed to the specified MAC CSR. This bit will remain set until the

operation is complete. In the case of a read this means that the host can

read valid data from the data register. The MAC_CSR_CMD and

MAC_CSR_DATA registers should not be modified until this bit is cleared.

R/nW. When set, this bit indicates that the host is requesting a read

operation. When clear, the host is performing a write.

R/W

29-8

Reserved.

7-0

CSR Address. The 8-bit value in this field selects which MAC CSR will be

accessed with the read or write operation.

R/W

00h

Offset:

A8h

Size:

32 bits

Bits

Description

Type

Default

31-0

MAC CSR Data. Value read from or written to the MAC CSR’s.

R/W

00000000h

Offset:

ACh

Size:

32 bits

Note:

The LAN9115 will not transmit pause frames or assert back pressure if the transmitter is disabled.

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