OM11077 NXP Semiconductors, OM11077 Datasheet - Page 243
OM11077
Manufacturer Part Number
OM11077
Description
MODULE DIMM LPC2478 ARM7
Manufacturer
NXP Semiconductors
Specifications of OM11077
Accessory Type
Module Card
For Use With/related Products
ARM-57TS-LPC2478
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
568-4742
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UM10237_4
User manual
Each receive descriptor takes two word locations (8 bytes) in memory. Likewise each
status field takes two words (8 bytes) in memory. Each receive descriptor consists of a
pointer to the data buffer for storing receive data (Packet) and a control word (Control).
The Packet field has a zero address offset, the control field has a 4 byte address offset
with respect to the descriptor address as defined in
Table 233. Receive Descriptor Fields
The data buffer pointer (Packet) is a 32 bits byte aligned address value containing the
base address of the data buffer. The definition of the control word bits is listed in
Table
Table 234. Receive Descriptor Control Word
Table 11–235
Table 235. Receive Status Fields
Each receive status consists of two words. The StatusHashCRC word contains a
concatenation of the two 9 bit hash CRCs calculated from the destination and source
addresses contained in the received frame. After detecting the destination and source
addresses, StatusHashCRC is calculated once, then held for every fragment of the same
frame.
The concatenation of the two CRCs is shown in
Table 236. Receive Status HashCRC Word
Symbol
Packet
Control
Bit
10:0
30:11 -
31
Symbol
StatusInfo
StatusHashCRC 0x4
Bit
8:0
15:9
24:16 DAHashCRC Hash CRC calculated from the destination address.
31:25 -
11–234.
Symbol
SAHashCRC Hash CRC calculated from the source address.
-
Symbol
Size
Interrupt
lists the fields in the receive status elements from the status array.
Address
offset
0x0
0x4
Address
offset
0x0
Description
Size in bytes of the data buffer. This is the size of the buffer reserved by the
device driver for a frame or frame fragment i.e. the byte size of the buffer
pointed to by the Packet field. The size is -1 encoded e.g. if the buffer is 8
bytes the size field should be equal to 7.
Unused
If true generate an RxDone interrupt when the data in this frame or frame
fragment and the associated status information has been committed to
memory.
Description
Unused
Unused
Rev. 04 — 26 August 2009
Bytes Description
4
4
Bytes Description
4
4
Base address of the data buffer for storing receive data.
Control information, see
Receive status return flags, see
The concatenation of the destination address hash CRC and
the source address hash CRC.
Table
Table
11–236:
Table
Chapter 11: LPC24XX Ethernet
11–233.
11–234.
Table
11–237.
UM10237
© NXP B.V. 2009. All rights reserved.
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