Freescale Semiconductor MPC5200B ユーザーズマニュアル

Freescale Semiconductor

14-27

The programming interface to the FIFO allows access to Data, Status, Control, Last Write Pointer, Last Read Pointer, Alarm, Read and Write 
Pointers for Transmit and Receive configurations. The FIFO can be accessed by byte, word, or longword, but all accesses must be aligned 
with the most significant byte (big endian) of the data port. BestComm supports byte, word or longword accesses. The processor supports 
longword access only. All register name access is longword aligned

.

0:28

—

Reserved

28:31

X_WMRK

Transmit FIFO Watermark—Frame transmission begins: 

• If the number of bytes selected by this field are written into the transmit FIFO, or 

• if an EOF is written to the FIFO, or 

• if the FIFO is full before the selected number of bytes are written.

Options are:

0000 =  64Bytes written to FIFO.

0001 = 128Bytes written to FIFO.

0010 = 192Bytes written to FIFO.

0011 = 256Bytes written to FIFO.

0100 = 320Bytes written to FIFO.

0101 = 384Bytes written to FIFO.

0110 = 448Bytes written to FIFO.

0111 = 512Bytes written to FIFO.

1000 = 576Bytes written to FIFO.

1001 = 640Bytes written to FIFO.

1010 = 704Bytes written to FIFO.

1011 = 768Bytes written to FIFO.

1100 = 832Bytes written to FIFO.

1101 = 896Bytes written to FIFO.

1110 = 960Bytes written to FIFO.

1111 = 1024Bytes written to FIFO.

0x184

Data

Data

Data

Data

Receive FIFO Data

0x188

Stat

Stat

Receive FIFO Status

0x18C

Ctl

Receive FIFO Control

0x190

LRF

LRF

Receive Last Read Frame Pointer

0x194

LWF

LWF

Receive Last Write Frame Pointer

0x198

Alarm

Alarm

Receive (High/Low) Alarm Pointer

0x19C

Read

Read

Receive FIFO Read Pointer

0x1A0

Write

Write

Receive FIFO Write Pointer

0x1A4

Data

Data

Data

Data

Transmit FIFO Data

0x1A8

Stat

Stat

Transmit FIFO Status

0x1AC

Ctl

Transmit FIFO Control

0x1B0

LRF

LRF

Transmit Last Read Frame Pointer