MCF5272CVF66J Freescale Semiconductor, MCF5272CVF66J Datasheet - Page 250

• Manufacturer Part Number: MCF5272CVF66J
• Description: IC MCU 166MHZ 196MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: MCF527xr

Specifications of MCF5272CVF66J

• 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
• Processor Series: MCF527x
• Core: ColdFire V2
• 3rd Party Development Tools: JLINK-CF-BDM26, EWCF
• Development Tools By Supplier: NNDK-MOD5272-KIT, NNDK-MOD5270-KIT
• Leaded Process Compatible: No
• Rohs Compliant: No
• Peak Reflow Compatible (260 C): No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: No

Ethernet Module
11.5.21 Receive Buffer Size Register (EMRBR)
The EMRBR register dictates the maximum size of all receive buffers. Note that because receive frames
are truncated at 2k-1 bytes, only bits 10–4 are used. This value should take into consideration that the
receive CRC is always written into the last receive buffer. To allow one maximum size frame per buffer,
R_BUFF_SIZE must be set to MAX_FL or larger. The R_BUFF_SIZE must be evenly divisible by 16. To
insure this, bits 3–0 are forced low. To minimize bus utilization (descriptor fetches), it is recommended
that R_BUFF_SIZE be at least 256 bytes.
This register,
11-32
31–11
10–4
Bits
3–0
Reset
Reset
Field
Field
Addr
R/W
R/W
31
15
R_BUFF_SIZE
Figure
Name
—
—
11-26, is not reset and must be initialized by the user prior to operation.
0000_0
MCF5272 ColdFire
—
Reserved, should be cleared.
Reserved, should be cleared.
Receive buffer size.
Figure 11-26. Receive Buffer Size (EMRBR)
Table 11-29. EMRBR Field Descriptions
11
®
Integrated Microprocessor User’s Manual, Rev. 3
10
0000_0000_0000_0000
MBAR + 0xC18
Read/Write
Read/Write
R_BUFF_SIZE
—
Description
4
3
Freescale Semiconductor
0000
—
16
0