MPC5125YVN400 Freescale Semiconductor, MPC5125YVN400 Datasheet - Page 375

• Manufacturer Part Number: MPC5125YVN400
• Description: IC MCU 32BIT E300 324TEPBGA
• Manufacturer: Freescale Semiconductor
• Series: MPC51xxr

Specifications of MPC5125YVN400

• Core Processor: e300
• Core Size: 32-Bit
• Speed: 400MHz
• Connectivity: CAN, EBI/EMI, Ethernet, I²C, USB OTG
• Peripherals: DMA, WDT
• Number Of I /o: 64
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.33 V ~ 1.47 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 324-PBGA
• Processor Series: MPC51xx
• Core: e300
• Data Bus Width: 32 bit
• Development Tools By Supplier: TWR-MPC5125-KIT, TWR-SER, TWR-ELEV, TOWER
• Maximum Clock Frequency: 400 MHz
• Operating Supply Voltage: 1.4 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Data Ram Size: 32 KB
• I/o Voltage: 3.3 V
• Interface Type: CAN, I2C
• Minimum Operating Temperature: - 40 C
• Program Memory Size: 32 bit
• Cpu Speed: 400MHz
• Embedded Interface Type: CAN, I2C, SPI, UART, USB
• Digital Ic Case Style: TEPBGA
• No. Of Pins: 324
• Rohs Compliant: Yes
• Cpu Family: MPC5xx
• Device Core Size: 32b
• Frequency (max): 400MHz
• Total Internal Ram Size: 32KB
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 324
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

the read management frame operation has completed. At this time, the contents of the ETH_MII_DATA
register match the original value written, except for the data field, where contents have been replaced by
the value read from the PHY register.
If the MII_DATA register is written while frame generation is in progress, the frame contents are altered.
Software should use the MII_STATUS register and/or the MII interrupt to avoid writing to the
ETH_MII_DATA register while frame generation is in progress.
14.3.5.8
The MII Speed Control (ETH_MII_SPEED) register provides control of the MII clock (MDC pin)
frequency, allows dropping the preamble on the MII management frame, and provides observability
(intended for manufacturing test) of an internal counter used in generating the MDC clock signal.
To be compliant with the IEEE MII specification, the MII_SPEED field must be programmed with a value
that provides an MDC frequency of less than or equal to 2.5 MHz. The MII_SPEED bitfield must be set
to a non-zero value to source a read or write management frame. After the management frame is complete,
the ETH_MII_SPEED register may optionally be set to 0 to turn off the MDC. The MDC generated has a
50% duty cycle, except when the MII_SPEED bitfield is changed during operation (the change takes effect
following a rising or falling edge of MDC).
If the system clock is 25 MHz, programming the ETH_MII_SPEED register to 0x0000_0005 results in an
MDC frequency of 25 MHz × 1/(2 × 5) = 2.5 MHz.
MII_SPEED bitfield as a function of system clock frequency.
Freescale Semiconductor
DIS_PREAMBLE Asserting this bit causes preamble (32 ones) not to be prepended to the MII management frame. The MII
Address: Base + 0x044
MII_SPEED
Reset
Reset
Field
W
W
R
R
16
0
0
0
0
0
MII Speed Control (ETH_MII_SPEED) Register
17
standard allows the preamble to be dropped if the attached PHY device(s) does not require it.
MII_SPEED controls the frequency of the MII management interface clock (MDC) relative to system clock.
A value of 0 in this field turns off the MDC and leaves it in a low-voltage state. Any non-zero value results in
the MDC frequency of 1/(mii_speed × 2) of the system clock frequency.
0
0
0
0
1
18
0
0
0
0
2
Figure 14-9. MII Speed Control (ETH_MII_SPEED) Register
19
0
0
0
0
3
Table 14-12. ETH_MII_SPEED field descriptions
MPC5125 Microcontroller Reference Manual, Rev. 2
20
4
0
0
0
0
21
0
0
0
0
5
22
0
0
0
0
6
Table 14-13
23
0
0
0
0
7
Description
PREA
MBLE
DIS_
24
8
0
0
0
shows optimum values for the
25
9
0
0
0
10
26
0
0
0
MII_SPEED
11
27
0
0
0
Fast Ethernet Controller (FEC)
12
28
0
0
0
Access: User read/write
13
29
0
0
0
14
30
0
0
0
14-19
15
31
0
0
0
0