MCF5272CVF66 Freescale Semiconductor, MCF5272CVF66 Datasheet - Page 233

• Manufacturer Part Number: MCF5272CVF66
• Description: IC MPU 32BIT 66MHZ 196-MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: MCF527xr

Specifications of MCF5272CVF66

• 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: -40°C ~ 85°C
• Package / Case: 196-MAPBGA
• 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: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 196
• Package Type: MA-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Not Compliant

11.5.5
The RDAR register,
the receive descriptor ring has been updated (empty receive buffers have been produced by the driver with
the E bit set).
The R_DES_ACTIVE bit is set whenever the register is written. This is independent of the data actually
written by the user. When set, the FEC polls the receive descriptor ring and processes receive frames
(provided ETHER_EN is also set). As soon as the FEC polls a receive descriptor whose E bit is not set, it
clears the R_DES_ACTIVE bit and stops polling the receive descriptor ring.
The RDAR register is cleared at reset and when ETHER_EN is cleared.
Table 11-11
Freescale Semiconductor
31–25
23–0
Bit
24
Reset
Reset
Field
Field
Addr
R/W
R/W
R_DES_ACTIVE
31
15
Receive Descriptor Active Register (RDAR)
describes the RDAR fields.
Name
—
—
Figure
MCF5272 ColdFire
—
Figure 11-9. Receive Descriptor Active Register (RDAR)
Reserved, should be cleared.
Set when this register is written, regardless of the value written. Cleared by the FEC whenever
no additional empty descriptors remain in the receive ring.
Reserved, should be cleared.
11-9, is a command register that should be written by the user to indicate that
Table 11-11. RDAR Register Field Descriptions
25
®
Integrated Microprocessor User’s Manual, Rev. 3
R_DES_ACTIVE
0000_0000_0000_0000
0000_0000_0000_0000
24
MBAR + 0x850
Read/Write
Read/Write
—
Description
23
—
Ethernet Module
16
0
11-15