PIC16LF84A-04I/SS【PDF 50/80 页】IC MCU FLASH 1KX14 EE 20SSOP

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Sheet目录3833

46页 47页 48页 49页 [50页]51页 52页 53页 54页

Micrel, Inc.

KSZ8851SNL/SNLI

August 2009

M9999-083109-2.0

Bit

Default Value

R/W

Description

0x0

RRXEF Release RX Error Frame

When this bit is written as 1, the current RX error frame buffer is released.

Note: This bit is self-clearing after the frame memory is released. The software should

wait for

the bit to be cleared before processing new RX frame.

TX Frame Data Pointer Register (0x84 – 0x85): TXFDPR

The value of this register determines the address to be accessed within the TXQ frame buffer. When the AUTO increment

is set, It will automatically increment the pointer value on write accesses to the data register.

The counter is incremented by one for every byte access, by two for every word access, and by four for every double

word access.

Bit

Default Value

R/W

Description

Reserved

0x0

TXFPAI TX Frame Data Pointer Auto Increment

When this bit is set, the TX Frame data pointer register increments automatically on

accesses to the data register. The increment is by one for every byte access, by two for

every word access, and by four for every doubleword access.

When this bit is reset, the TX frame data pointer is manually controlled by user to access

the TX frame location.

13-11

Reserved

10-0

0x000

TXFP TX Frame Pointer

TX Frame Pointer index to the Frame Data register for access.

This field reset to next available TX frame location when the TX Frame Data has been

enqueued through the TXQ command register.

RX Frame Data Pointer Register (0x86 – 0x87): RXFDPR

The value of this register determines the address to be accessed within the RXQ frame buffer. When the Auto Increment

is set, it will automatically increment the RXQ Pointer on read accesses to the data register.

The counter is incremented is by one for every byte access, by two for every word access, and by four for every double

word access.

Bit

Default Value

R/W

Description

Reserved

0x0

RXFPAI RX Frame Pointer Auto Increment

When this bit is set, the RXQ Address register increments automatically on accesses to

the data register. The increment is by one for every byte access, by two for every word

access, and by four for every double word access.

When this bit is reset, the RX frame data pointer is manually controlled by user to access

the RX frame location.

13-11

Reserved

10-0

0x000

RXFP RX Frame Pointer

RX Frame data pointer index to the Data register for access.

This pointer value must reset to 0x000 before each DMA operation from the host CPU to

read RXQ frame buffer.

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