OM11077 NXP Semiconductors, OM11077 Datasheet - Page 229

• 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

NXP Semiconductors
UM10237_4
User manual
7.2.2 Status Register (Status - 0xFFE0 0104)
7.2.3 Receive Descriptor Base Address Register (RxDescriptor - 0xFFE0 0108)
Table 206. Command register (Command - address 0xFFE0 0100) bit description
All bits can be written and read. The Tx/RxReset bits are write only, reading will return a 0.
The Status register (Status) is a Read Only register with an address of 0xFFE0 0104. Its
bit definition is shown in
Table 207. Status register (Status - address 0xFFE0 0104) bit description
The values represent the status of the two channels/datapaths. When the status is 1, the
channel is active, meaning:
The status transitions from active to inactive if the channel is disabled by a software reset
of the Rx/TxEnable bit in the Command register and the channel has committed the status
and data of the current frame to memory. The status also transitions to inactive if the
transmit queue is empty or if the receive queue is full and status and data have been
committed to memory.
The Receive Descriptor base address register (RxDescriptor) has an address of
0xFFE0 0108. Its bit definition is shown in
Table 208. Receive Descriptor Base Address register (RxDescriptor - address 0xFFE0 0108)
Bit
8
9
10
31:11
Bit
0
1
31:2
Bit
1:0
31:2
•
•
•
It is enabled and the Rx/TxEnable bit is set in the Command register or it just got
disabled while still transmitting or receiving a frame.
Also, for the transmit channel, the transmit queue is not empty
i.e. ProduceIndex != ConsumeIndex.
Also, for the receive channel, the receive queue is not full
i.e. ProduceIndex != ConsumeIndex - 1.
Symbol
-
RxDescriptor
Symbol
RxStatus If 1, the receive channel is active. If 0, the receive channel is inactive.
TxStatus If 1, the transmit channel is active. If 0, the transmit channel is inactive. 0
-
Symbol
TxFlowControl
RMII
FullDuplex
-
bit description
Function
Unused
Rev. 04 — 26 August 2009
Function
Fixed to ’00’
MSBs of receive descriptor base address.
Table
Function
Enable IEEE 802.3 / clause 31 flow control sending pause
frames in full duplex and continuous preamble in half duplex.
When set to ’1’, RMII mode is selected; if ’0’, MII mode is
selected.
When set to ’1’, indicates full duplex operation.
Unused
11–207.
Table
11–208.
Chapter 11: LPC24XX Ethernet
UM10237
© NXP B.V. 2009. All rights reserved.
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Reset
value
-
0x0
Reset
value
0
0
0
0x0
Reset
value
0
0x0