MCF5272VF66 Freescale, MCF5272VF66 Datasheet - Page 234
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MCF5272VF66
Manufacturer Part Number
MCF5272VF66
Description
Manufacturer
Freescale
Datasheet
1.MCF5272VF66.pdf
(544 pages)
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
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Ethernet Module
11.5.6
The TDAR register,
the transmit descriptor ring has been updated, that is, transmit buffers have been defined by the driver with
the ready bit set in the buffer descriptor.
The X_DES_ACTIVE bit is set whenever the register is written. This is independent of the data actually
written by the user. When TDAR is set, the FEC polls the transmit descriptor ring and processes transmit
frames (provided ETHER_EN is also set). As soon as the FEC polls a transmit descriptor whose ready bit
is not set, it clears the X_DES_ACTIVE bit and stops polling the transmit descriptor ring.
The TDAR register is cleared at reset and when ETHER_EN is cleared.
register.
Table 11-12
11-16
31–25
23–0
Bits
24
Reset
Reset
Field
Field
Addr
R/W
R/W
X_DES_ACTIVE
Transmit Descriptor Active Register (TDAR)
describes the TDAR fields.
31
15
Name
—
—
Figure
MCF5272 ColdFire
Figure 11-10. Transmit Descriptor Active Register (TDAR)
11-10, is a command register which should be set by the user to indicate that
—
Reserved, should be cleared.
Set to one when this register is written, regardless of the value written. Cleared by the FEC
whenever no additional ready descriptors remain in the transmit ring.
Reserved, should be cleared.
Table 11-12. TDAR Field Descriptions
®
Integrated Microprocessor User’s Manual, Rev. 3
25
X_DES_ACTIVE
0000_0000_0000_0000
0000_0000_0000_0000
MBAR +0x854
Read/Write
Read/Write
24
—
Description
23
Figure 11-10
—
Freescale Semiconductor
describes this
16
0
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