MCF5272VF66 Freescale Semiconductor, MCF5272VF66 Datasheet - Page 248

• 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: -
• Data Converters: -

Ethernet Module
11.5.19 Pointer-to-Receive Descriptor Ring (ERDSR)
This register,
external memory. This pointer must be long-word aligned. However, it is recommended it be aligned on a
16-byte boundary (address evenly divisible by 16) in order to improve bus utilization. Bits 1 and 0 should
be written to 0 by the user. Non-zero values in these two bit positions are ignored by the hardware.
This register is not reset and must be initialized by the user prior to operation.
11-30
31–2
Bits
1–0
Reset
Reset
Field
Field
Addr
R/W
R/W
31
15
R_DES_START
Figure
Name
—
11-24, provides a pointer to the start of the circular receive buffer descriptor queue in
MCF5272 ColdFire
Figure 11-24. Pointer-to-Receive Descriptor Ring (ERDSR)
Reserved, should be cleared.
Pointer to start of receive buffer descriptor queue.
Table 11-27. ERDSR Field Descriptions
®
Integrated Microprocessor User’s Manual, Rev. 3
R_DES_START
R_DES_START
MBAR + 0xC10
Read/Write
Read/Write
Undefined
Undefined
Description
Freescale Semiconductor
2
0
1
16
0
0