MCF5272CVF66J Freescale Semiconductor, MCF5272CVF66J Datasheet - Page 256
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MCF5272CVF66J
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MCF5272CVF66J
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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Ethernet Module
An underrun occurs when, during transmit, the transmit FIFO empties before the end of the frame. Then,
a bad CRC is appended to the partially transmitted data. In addition, the UN bit is set in the last BD for the
current frame. This situation can occur if the FEC cannot access an internal bus, or if the next BD in the
frame is not available.
11-38
Bits
5–2
8
7
6
1
0
-
-
Tx Buffer Pointer Written by the user. The transmit buffer pointer, which contains the address of the associated data
Data Length
Name
CSL
RC
UN
HB
LC
RL
Anytime the software driver sets an R bit in a transmit descriptor, the driver
should immediately write to TDAR.
MCF5272 ColdFire
Heartbeat error. Written by the FEC and is valid only if L = 1. The collision input was not asserted
within the heartbeat window following the completion of transmission. Cannot be set unless the
HBC bit is set in the TCR register.
Late collision. Written by the FEC and is only valid if L = 1. A collision has occurred after 56 data
bytes are transmitted. The FEC terminates the transmission.
Retransmission limit. Written by the FEC and is only valid if L = 1. The transmitter has failed retry
limit + 1 attempts to successfully transmit a message due to repeated collisions on the medium.
Retry count. Written by the FEC and is valid only if L = 1. These four bits indicate the number of
retries required before this frame is successfully transmitted. If RC = 0, then the frame was
transmitted correctly the first time. If RC = 15, then the frame was transmitted successfully while
the retry count was at its maximum value. If RL is set, then RC has no meaning.
Underrun. Written by the FEC and is only valid if L = 1. The FEC encountered a transmit FIFO
underrun while transmitting one or more of the data buffers associated with this frame. When
transmit FIFO underrun occurs, transmission of the frame stops, and an incorrect CRC is
appended. The remaining buffer(s) associated with this frame are sent as a DMA and dumped by
the transmit logic.
Carrier sense lost. Written by the FEC and is valid only if L = 1. Carrier sense dropped out or never
asserted during transmission of a frame without collision.
Written by the user. Data length is the number of octets the FEC should transmit from this BD’s
data buffer. It is never modified by the FEC. Bits [10–0] are used by the DMA engine; bits [15–11]
are ignored.
buffer, may be even or odd. The buffer must reside in memory external to the FEC. This value is
never modified by the FEC.
Table 11-35. TxBD Field Descriptions (continued)
®
Integrated Microprocessor User’s Manual, Rev. 3
NOTE
Description
Freescale Semiconductor
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