PNX1500E NXP Semiconductors, PNX1500E Datasheet - Page 702
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PNX1500E
Manufacturer Part Number
PNX1500E
Description
Manufacturer
NXP Semiconductors
Datasheet
1.PNX1500E.pdf
(828 pages)
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Volume 1 of 1
5. LAN100 Functions
PNX15XX_PNX952X_SER_N_4
Product data sheet
5.1.1 Overview
5.1 MMIO Interface
word contains flags returned by the LAN100 and flags generated by the Transmit
Datapath reflecting the status of the transmission.
the StatusInfo word.
Table 11: Transmit Status Information Word
For multi-fragment packets, the value of the LateCollision, ExcessiveCollision,
ExcessiveDefer, Defer and CollissionCount bits in all but the last fragment in the
packet will be 0. The status of the last fragment in the packet will copy the value for
these bits from the MII Interface. All fragment statuses will have valid Error,
NoDescriptor and Underrun bits.
This section defines the functions of the LAN100. After introducing the DMA concepts
and giving a description of the basic transmit and receive functions, this section
covers such advanced features as flow control, receive filtering, and the like.
The LAN100 MMIO interface is connected to the DCS system control bus so that the
host registers are visible from the CPU. The MMIO interface allows device driver
software on the CPU to interact with the LAN100.
The MMIO interface has a 32-bit datapath and an address aperture of 4KB. It only
supports word accesses.
Bit
31
30
29
28
27
26
25
24:21 CollisionCount
20:0
Name
Error
NoDescriptor
Underrun
LateCollision
ExcessiveCollision Indicates this packet exceeded the maximum collision limit and
ExcessiveDefer
Defer
-
Rev. 4.0 — 03 December 2007
Chapter 23: LAN100 — Ethernet Media Access Controller
Function
An error occurred during transmission. This is a logic OR of
LateCollision, ExcessiveCollision and ExcessiveDefer.
The Tx stream is interrupted, because a descriptor is not
available.
A Tx underrun occurred because the adapter did not produce
transmit data or the adapter is not accepting statuses.
An Out-of-window-collision was seen, causing packet abort.
(See TSV[29].)
was aborted. (See TSV[28].)
This packet incurred deferral beyond the maximum deferral limit
and was aborted. (See TSV[27].)
This packet incurred deferral, because the medium was
occupied. This is not an error unless excessive deferral occurs.
(See TSV[26].)
The number of collisions this packet incurred, up to the
Retransmission Maximum. (See TSV[19:16].)
Unused
Table 1 on page 23-675
PNX15xx/952x Series
lists the LAN100 registers.
Table 11
lists the bit definitions in
© NXP B.V. 2007. All rights reserved.
23-702
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