MCF5272VF66 Freescale, MCF5272VF66 Datasheet - Page 239

• Manufacturer Part Number: MCF5272VF66
• Manufacturer: Freescale

Specifications of MCF5272VF66

• Family Name: MCF5xxx
• Device Core: ColdFire
• Device Core Size: 32b
• Frequency (max): 66MHz
• Instruction Set Architecture: RISC
• Supply Voltage 1 (typ): 3.3V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 196
• Package Type: MA-BGA
• Lead Free Status / RoHS Status: Not Compliant

11.5.11 Transmit FIFO Watermark (TFWR)
The TFWR register, shown in
before transmission of a frame can begin. Setting TFWR to larger values reduces the risk of transmit FIFO
underrun due to system bus latency.
Table 11-18
Freescale Semiconductor
31–2
Bits
1–0
Reset
Reset
Field
Field
Addr
R/W
R/W
describes the TFWR fields.
X_WMRK
31
15
Name
—
MCF5272 ColdFire
Reserved, should be cleared.
Transmit FIFO watermark. Frame transmission begins when the number of bytes selected by this
field are written into the transmit FIFO, if an end of frame has been written to the FIFO, or if the
FIFO is full before the selected number of bytes are written. The options are:
0X 64 bytes written to transmit FIFO
10 128 bytes written to transmit FIFO
11 192 bytes written to transmit FIFO
Figure 11-15. Transmit FIFO Watermark (TFWR)
Figure
Table 11-18. TFWR Field Descriptions
11-15, controls the amount of data required in the transmit FIFO
®
Integrated Microprocessor User’s Manual, Rev. 3
0000_0000_0000_00
0000_0000_0000_0000
—
MBAR + 0x8E4
Read/Write
Read/Write
—
Description
2
X_WMRK
1
Ethernet Module
00
16
0
11-21