PNX1502E Datasheet, PDF (681/819 Pages) NXP Semiconductors – Connected Media Processor

Philips Semiconductors
Volume 1 of 1
PNX15xx Series
Chapter 23: LAN100 — Ethernet Media Access Controller
Table 2: LAN100 Registers …Continued
Bit Symbol
Acces
s
Value
Description
19:16 TransmitCollisionCount RO
The number of collisions the current packet incurred during
transmission attempts. The maximum number of collisions (16)
cannot be represented.
15:0 TransmitByteCount
RO
The total number of bytes in the frame not counting the collided
bytes.
Offset 0x07 2160
Receive Status Vector Register (RSV)
The Receive Status Vector register stores the most recent receive status returned by the MII Interface.
31 -
-
Unused
30 VLAN
RO
The frame’s length/type field contained 0x8100, which is the VLAN
protocol identifier.
29 UnsupportedOpcode RO
The current frame was recognized as a Control Frame, but it
contains an unknown opcode.
28 Pause
RO
The frame was a control frame with a valid PAUSE opcode.
27 ControlFrame
RO
The frame was a control frame.
26 DribbleNibble
RO
Indicates that after the end of packet, another 1-7 bits were
received. A single nibble, called the “dribble nibble,” is formed but
not sent out.
25 Broadcast
RO
The packet’s destination was a broadcast address.
24 Multicast
RO
The packet’s destination was a multicast address.
23 ReceiveOK
RO
The packet had valid CRC and no symbol errors.
22 LengthOutOfRange
RO
Indicates that the frame type/length field was larger than 1518
bytes.
21 LengthCheckError
RO
Indicates that the frame length field does not match the actual
number of data items, and is not a type field.
20 CRCError
RO
The attached CRC in the packet did not match the CRC generated
internally.
19 ReceiveCodeViolation RO
Indicates that MII data does not represent a valid receive code when
LAN_RX_ER is asserted during the data phase of a frame.
18 CarrierEventPreviouslyS RO
een
Indicates that at some time since the last receive statistics, a carrier
event was detected.
17 RXDVEventPreviouslyS RO
een
Indicates that the last receive event seen was not long enough to be
a valid packet.
16 PacketPreviouslyIgnored RO
Indicates that a packet since the last RSV was dropped.
15:0 ReceivedByteCount
RO
Indicates length of received frame.
Offset 0x07 2170
Flow Control Counter Register (FlowControlCounter)
31:16 PauseTimer
R/W
In full-duplex mode, the PauseTimer field specifies the value that is
inserted into the pause timer field of a pause flow control frame. In
half-duplex mode, the PauseTimer field specifies the number of
backpressure cycles.
15:0 MirrorCounter
R/W
In full-duplex mode, the MirrorCounter specifies the number of
cycles to wait before reissuing the Pause control frame. In
half-duplex mode, the MirrorCounter allows to keep on sending out
the preamble until TxFlowControl is de-asserted.
Offset 0x07 2174
Flow Control Status Register (FlowControlStatus)
12NC 9397 750 14321
Product data sheet
Rev. 2 — 1 December 2004
© Koninklijke Philips Electronics N.V. 2002-2003-2004. All rights reserved.
23-19