pnx1700 NXP Semiconductors, pnx1700 Datasheet - Page 705

• Manufacturer Part Number: pnx1700
• Description: Connected Media Processor
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Volume 1 of 1
PNX17XX_SER_1
Preliminary data sheet
The Packet word is a 32-bit byte-aligned address value containing the base address
of the data buffer. The time-stamp field is a 32-bit value which is compared against
the internal Time-stamp Counter for real-time transmission. The definition of the
Control word bits is listed in
Table 9: Transmit Descriptor Control Word
Table 10
Table 10: Transmit Status Structure
The Transmit Status Structure consists of two words. The StatusTimeStamp word
contains a copy of the Time-stamp Counter value at the time the Transmit Status
Structure was received from the MII Interface. If the fragment is not the last fragment
in the packet, the time-stamp value will be a copy of the Time-stamp Counter at the
time all data in the fragment was accepted by the Tx retry module. The StatusInfo
Bit
31
30
29
28
27
26
25:11
10:0
Name
StatusInfo
StatusTimeStamp 0x4
Name
Interrupt If set, generate an Tx(Rt)Done interrupt when the data in this packet or
Last
CRC
Pad
Huge
Override Per-packet override. If set, bits [30:27] override the defaults from the MII
Size
lists the fields in the Transmit Status Structure.
Function
packet fragment has been sent and the associated status information has
been committed to memory.
If set, this bit indicates that this is the descriptor for the last fragment in the
receive packet. If not set, the fragment from the next descriptor should be
appended.
If set, append a hardware CRC to the packet.
If set, pad short packets to 64 bytes.
If set, this bit enables huge frames. When not set, this bit prevents
transmission of more than MAXF[15:0]. When set, it allows unlimited frame
sizes.
Interface internal registers. If not set, Control bits [30:27] will be ignored
and the default values from the MII Interface will be used.
Unused
Size in bytes of the data buffer. This is the size of the packet or fragment as
it must be fetched by the DMA manager. In most cases, it will be equal to
the byte size of the data buffer pointed to by the Packet field of the
descriptor. Size is –1 encoded, e.g., a buffer of 8 bytes is encoded as the
Size value 7.
Address
Offset
0x0
Rev. 1 — 17 March 2006
Chapter 23: LAN100 — Ethernet Media Access Controller
Siz
e
31:0 Transmit status return flags, see
31:0 Time-stamp of transmit completion.
Table 9
Function
.
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
PNX17xx Series
Table
11.
23-32