NNDK-MOD5272-KIT NetBurner Inc, NNDK-MOD5272-KIT Datasheet - Page 253
NNDK-MOD5272-KIT
Manufacturer Part Number
NNDK-MOD5272-KIT
Description
KIT DEVELOP NETWORK FOR MOD5272
Manufacturer
NetBurner Inc
Series
ColdFire®r
Datasheets
1.MOD5272-100IR.pdf
(2 pages)
2.MOD5272-100IR.pdf
(550 pages)
3.NNDK-MOD5282-KIT.pdf
(2 pages)
Specifications of NNDK-MOD5272-KIT
Main Purpose
*
Embedded
*
Utilized Ic / Part
MOD5272
Primary Attributes
*
Secondary Attributes
*
Processor To Be Evaluated
MOD5272
Interface Type
RS-232, RS-485, USB
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
Other names
528-1001
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MOTOROLA
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, Figure 11-25, is not reset and must be initialized by the user prior to
operation.
Reset
Reset
Reset
Reset
Field
Field
Field
Field
Addr
Addr
R/W
R/W
R/W
R/W
31–2
31
15
31
15
Bits
1–0
Figure 11-24. Pointer to Transmit Descriptor Ring (ETDSR)
X_DES_START
0000_0
—
Name
—
Figure 11-25. Receive Buffer Size (EMRBR)
Table 11-28. ETDSR Field Descriptions
11
Pointer to start of transmit buffer descriptor queue.
Reserved, should be cleared.
Chapter 11. Ethernet Module
10
X_DES_START
0000_0000_0000_0000
X_DES_START
MBAR + 0xC14
MBAR + 0xC18
Read/Write
Read/Write
Read/Write
Read/Write
Undefined
Undefined
R_BUFF_SIZE
—
Description
4
3
Programming Model
2
0000
—
0
1
11-29
16
16
0
0
0
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