PNX1701EH,557 NXP Semiconductors, PNX1701EH,557 Datasheet - Page 728
PNX1701EH,557
Manufacturer Part Number
PNX1701EH,557
Description
Manufacturer
NXP Semiconductors
Datasheet
1.PNX1701EH557.pdf
(832 pages)
Specifications of PNX1701EH,557
Operating Temperature (min)
0C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Lead Free Status / Rohs Status
Not Compliant
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Philips Semiconductors
Volume 1 of 1
PNX17XX_SER_1
Preliminary data sheet
(because the GlobalTimeStamp counter wraps around 0), packets with time-stamps
that are late are only sent out when the difference between the time-stamp of the
packet and the local time-stamp of the time-stamp generator is less than half the total
time-stamp range , that is, less than 2
packet will not be transmitted, and the packet and all other packets in the real-time
descriptor list must wait until the value of the time-stamp generator wraps around to
its time-stamp value, or until software removes such a “stuck” packet by soft resetting
the Transmit Datapath.
The register BlockZone can be used to specify a time period before a transmit
time-stamp value during which no new transmission of non-real-time packets can be
started. This can help to free up the Ethernet wire for the impending real-time packet.
The unit of time of the BlockZone register is equal to the unit of time of the time-stamp
generator.
In pseudo-code, the real-time/non-real-time arbitration proceeds as follows:
If a non-real-time packet is still occupying the transmit logic when the time-stamp
moment of a real-time packet is reached, then the packet will be transmitted as soon
as the non-real-time packet has finished. When the value in BlockZone is 0, the
BlockZone mechanism is disabled.
Apart from using time-stamps for real-time transmission, the LAN100 also reports
back to software the actual moment that packets are received or transmitted, as
specified in
diff[31:0] = GlobalTimeStamp[31:0]
bs[31:0] = GlobalTimeStamp[31:0] + BlockZone[31:0]
if (!diff[31]) // is GlobalTimeStamp > descriptor time-stamp?
else if (!bs)
else
- TxRtDescriptor.timeStamp[31:0];
- TxRtDescriptor.timeStamp[31:0]
// True
// If possible, issue TxRt packet
// We are in the BlockZone, so do not issue
// If possible, issue Tx packet
Section
Rev. 1 — 17 March 2006
5.7.
Chapter 23: LAN100 — Ethernet Media Access Controller
31
. If the difference is more than 2
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
PNX17xx Series
31
, then the
23-55
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