Datenblatt-Suchmaschine für elektronische Bauteile
  German  ▼
ALLDATASHEETDE.COM

X  

DP83934CVUL-20 Datenblatt(PDF) 28 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Teilenummer DP83934CVUL-20
Bauteilbeschribung  MHz SONICTM-T Systems-Oriented Network Interface Controller with Twisted Pair Interface
Download  104 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Hersteller  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83934CVUL-20 Datenblatt(HTML) 28 Page - National Semiconductor (TI)

Back Button DP83934CVUL-20 Datasheet HTML 24Page - National Semiconductor (TI) DP83934CVUL-20 Datasheet HTML 25Page - National Semiconductor (TI) DP83934CVUL-20 Datasheet HTML 26Page - National Semiconductor (TI) DP83934CVUL-20 Datasheet HTML 27Page - National Semiconductor (TI) DP83934CVUL-20 Datasheet HTML 28Page - National Semiconductor (TI) DP83934CVUL-20 Datasheet HTML 29Page - National Semiconductor (TI) DP83934CVUL-20 Datasheet HTML 30Page - National Semiconductor (TI) DP83934CVUL-20 Datasheet HTML 31Page - National Semiconductor (TI) DP83934CVUL-20 Datasheet HTML 32Page - National Semiconductor (TI) Next Button
Zoom Inzoom in Zoom Outzoom out
 28 / 104 page
background image
50 Buffer Management (Continued)
543 Receive Descriptor Area (RDA)
After the SONIC-T buffers a packet to memory it writes 6
words of status and control information into the RDA reads
the link field to the next Receive Descriptor and writes to
the in-use field of the current descriptor In 32-bit mode the
upper word Dk3116l is not used This unused area in
memory should not be used for other purposes since the
SONIC-T may still write into these locations Each Receive
Descriptor consists of the following sections
(Figure 5-6)
TLF11719 – 19
FIGURE 5-6 Receive Descriptor Format
receive status
indicates status of the received packet The
SONIC-T writes the Receive Control register values into this
field
Figure 5-7 shows the receive status format This field
is loaded from the contents of the Receive Control register
Note that ERR RNT BRD PRO and AMC are configura-
tion bits and are programmed during initialization See Sec-
tion 633 for the description of the Receive Control register
15
14
13
12
11
10
9
8
ERR
RNT
BRD
PRO
AMC
LB1
LB0
MC
76
5
4
3
2
1
0
BC
LPKT
CRS
COL
CRCR
FAER
LBK
PRX
FIGURE 5-7 Receive Status Format
byte count
gives the length of the complete packet from
the start of Destination Address to the end of Frame Check
Sequence (FCS)
packet pointer
a 32-bit pointer that locates the packet in
the RBA The SONIC-T writes the contents of the CRBA01
registers into this field
sequence numbers
this field displays the contents of two
8-bit counters (modulo 256) that sequence the RBAs used
and the packets buffered These counters assist the system
in determining when an RBA has been completely process-
ed The sequence numbers allow the system to tally the
packets that have been processed within a particular RBA
There are two sequence numbers that describe a packet
the RBA Sequence Number and the Packet Sequence
Number
When a packet is buffered to memory
the
SONIC-T maintains a single RBA Sequence Number for all
packets in an RBA and sequences the Packet Number for
succeeding packets in the RBA When the SONIC-T uses
the next RBA it increments the RBA Sequence Number and
clears the Packet Sequence Number The RBA’s sequence
counter is not incremented when the Read RRA command
is issued in the Command register The format of the Re-
ceive Sequence Numbers is shown in
Figure 5-8 These
counters are reset during a SONIC-T hardware reset or by
writing zero to them
15
8
7
0
RBA Sequence Number
Packet Sequence Number
(Modulo 256)
(Modulo 256)
FIGURE 5-8 Receive Sequence Number Format
receive link field
a 15-bit pointer (A15 – A1) that locates
the next receive descriptor The LSB of this field is the End
Of List (EOL) bit and indicates the last descriptor in the list
(Initialized by the system)
in-use field
this field provides a handshake between the
system and the SONIC-T to indicate the ownership of the
descriptor When the system avails a descriptor to the
SONIC-T it writes a non-zero value into this field The
SONIC-T in turn sets this field to all ‘‘0’s’’ when it has
finished processing the descriptor (That is when the CRDA
register has advanced to the next receive descriptor) Gen-
erally the SONIC-T releases control after writing the status
and control information into the RDA If however the SON-
IC-T has reached the last descriptor in the list it maintains
ownership of the descriptor until the system has appended
additional descriptors to the list The SONIC-T then relin-
quishes control after receiving the next packet (See Sec-
tion 5461 for details on when the SONIC-T writes to this
field) The receive packet descriptor format is shown in
Fig-
ure 5-6
544 Receive Buffer Management Initialization
The Receive Resource Descriptor and Buffer areas (RRA
RDA RBA) in memory and the appropriate SONIC-T regis-
ters must be properly initialized before the SONIC-T begins
buffering packets This section describes the initialization
process
5441 Initializing The Descriptor Page
All descriptor areas (RRA RDA and TDA) used by the
SONIC-T reside within areas up to 32k (word) or 16k (long
word) pages This page may be placed anywhere within the
32-bit address range by loading the upper 16 address lines
into the UTDA URDA and URRA registers
5442 Initializing The RRA
The initialization of the RRA consists of loading the four
SONIC-T RRA registers and writing the resource descriptor
information to memory
The RRA registers are loaded with the following values
Resource Start Area (RSA) register
The RSA is loaded
with the lower 16-bit address of the beginning of the RRA
Resource End Area (REA) register
The REA is loaded
with the lower 16-bit address of the end of the RRA The
end of the RRA is defined as the address of the last
RXrsrcptr0 field in the RRA plus 4 words in 16-bit mode or 4
long words in 32-bit mode
(Figure 5-4)
Resource Read Pointer (RRP) register
The RRP is load-
ed with the lower 16-bit address of the first resource de-
scriptor the SONIC-T reads
Resource Write Pointer (RWP) register
The RWP is load-
ed with the lower 16-bit address of the next vacant location
where a resource descriptor will be placed by the system
Note
The RWP register must only point to either (1) the RXrsrcptr0 field of
one of the RRA Descriptors (2) the memory address that the RSA
points to (the start of the RRA) or (3) the memory address that the
REA points to (the end of the RRA) When the RWP e RRP compari-
son is made it is performed after the complete RRA descriptor has
been read and not during the fetch Failure to set the RWP to any of
the above values prevents the RWP e RRP comparison from ever
becoming true
28


Ähnliche Teilenummer - DP83934CVUL-20

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Texas Instruments
DP83934 TI1-DP83934 Datasheet
1Mb / 106P
[Old version datasheet]   DP83934CVUL-20/25 MHz SONIC(TM)-T Systems-Oriented Network Interface Controller with Twisted Pair Interface
logo
Pulse A Technitrol Comp...
DP83934 PULSE-DP83934 Datasheet
253Kb / 12P
   LAN DISCRETE TRANSFORMER MODULES
G003.U 2/07
More results

Ähnliche Beschreibung - DP83934CVUL-20

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
National Semiconductor ...
DP83936AVUL-20 NSC-DP83936AVUL-20 Datasheet
1Mb / 104P
   Full Duplex SONICTM-T Systems-Oriented Network Interface Controller with Twisted Pair Interface
DP83932C-20 NSC-DP83932C-20 Datasheet
1Mb / 98P
   MHz SONICTM Systems-Oriented Network Interface Controller
DP83916 NSC-DP83916 Datasheet
1Mb / 96P
   SONICTM-16 Systems-Oriented Network Interface Controller
logo
Texas Instruments
DP83934 TI1-DP83934 Datasheet
1Mb / 106P
[Old version datasheet]   DP83934CVUL-20/25 MHz SONIC(TM)-T Systems-Oriented Network Interface Controller with Twisted Pair Interface
logo
Winbond
W89C926 WINBOND-W89C926 Datasheet
395Kb / 48P
   PCMCIA ETHERNET NETWORK TWISTED PAIR INTERFACE CONTROLLER
logo
National Semiconductor ...
DP83905 NSC-DP83905 Datasheet
1Mb / 80P
   AT Local Area Network Twisted-Pair Interface Controller
DP83902A NSC-DP83902A Datasheet
851Kb / 70P
   ST-NICTM Serial Network Interface Controller for Twisted Pair
logo
Winbond
W89C940 WINBOND-W89C940 Datasheet
353Kb / 61P
   ELANC-PCI (TWISTED-PAIR ETHER-LAN CONTROLLER WITH PCI INTERFACE)
logo
List of Unclassifed Man...
83C694 ETC-83C694 Datasheet
204Kb / 33P
   TWISTED PAIR INTERFACE AND MACHESTER ENCODER/DECODER
logo
SMSC Corporation
83C694D SMSC-83C694D Datasheet
205Kb / 33P
   Twisted-Pair Interface and Manchester Encoder/Decoder
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100  ...More


Datenblatt Download

Go To PDF Page


Link URL




Privatsphäre und Datenschutz
ALLDATASHEETDE.COM
War ALLDATASHEET hilfreich?  [ DONATE ] 

Über Alldatasheet   |   Werbung   |   Kontakt   |   Privatsphäre und Datenschutz   |   Linktausch   |   Hersteller
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com