MCF5272VF66 Freescale Semiconductor, MCF5272VF66 Datasheet - Page 234
MCF5272VF66
Manufacturer Part Number
MCF5272VF66
Description
IC MPU 32BIT 66MHZ 196-MAPBGA
Manufacturer
Freescale Semiconductor
Series
MCF527xr
Specifications of MCF5272VF66
Core Processor
Coldfire V2
Core Size
32-Bit
Speed
66MHz
Connectivity
EBI/EMI, Ethernet, I²C, SPI, UART/USART, USB
Peripherals
DMA, WDT
Number Of I /o
32
Program Memory Size
16KB (4K x 32)
Program Memory Type
ROM
Ram Size
1K x 32
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Oscillator Type
External
Operating Temperature
0°C ~ 70°C
Package / Case
196-MAPBGA
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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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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