MCF5272VF66 Freescale, MCF5272VF66 Datasheet - Page 248

• Manufacturer Part Number: MCF5272VF66
• Manufacturer: Freescale

Specifications of MCF5272VF66

• 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: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 196
• Package Type: MA-BGA
• Lead Free Status / RoHS Status: Not Compliant

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