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| 型號： | QR0001 |
| 文件頁數(shù)： | 21/40頁 |
| 文件大小： | 440K |
| 代理商： | QR0001 |
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4.0 Ring Interface
(Continued)
TABLE 4.4. Ring Port Type Field
T
[
1
]
T
[
0
]
Name
Description
0
0
Head
A head symbol appears on Up
or on the Dn Ports.
0
1
Payload
A data or frame symbol
appears on the Up or on the Dn
Ports.
1
0
Tail
The last payload symbol of a
packet appears on the Up or Dn
Ports.
1
1
Access
A Voucher, Ticket, Abort or Null
symbol is present on the Up or
the Dn Ports.
4.10 Head Symbol on the Ring
The Controller regenerates head symbols to mark the start
of packets that it introduces to the ring. The head symbol is
regenerated from the head written by the client at the trans-
mit port. The number of heads that appear on the ring has
no guaranteed relationship to the number of heads loaded
at the transmit port. Head symbols on the ring carry informa-
tion in the connection, source, target, and hop fields. Table
4.5 shows the field format for the head symbols on the ring
ports.
TABLE 4.5. Packet Head Format at the Ring Ports
Type F 31:30 29:28 27:24 23:20 19:16 15:12 11:8
7:4
3:0
0
0
0
Conn Srce
Trgt Hop 1 Hop 2 Hop 3 Hop 4 Hop 5
4.11 Payload Symbols on the Ring
A type field of 1 identifies the symbol field as a payload
symbol. A payload is 33 bits wide. The frame bit distin-
guishes frame from data symbols. Tables 4.6 and 4.7 show
the field format for payload symbols on the ring.
TABLE 4.6. Data Payload Format at the Ring Ports
T(1:0)
F
31:0
1
0
Data Symbol
TABLE 4.7. Frame Payload Format at the Ring Ports
T(1:0)
F
31:0
1
1
Frame Symbol
4.12 Tall Symbol on the Ring
A type field of 2 identifies the symbol field as a tail symbol,
which is nothing else but the last payload symbol of a pack-
et. A tail may carry frame or data, as determined by the
state of the frame bit. These format of these symbol are
shown in Tables 4.8 and 4.9.
TABLE 4.8. Tall-Data Format at the Ring Ports
T(1:0)
F
31:0
2
0
Data Symbol Acting as a Packet Trail
TABLE 4.9. Tail-Frame Format at the Ring Ports
T(1:0)
F
31:0
2
1
Frame Symbol Acting as a Packet Trail
4.13 Access Symbols on the Ring
The fourth kind of symbols depicted by a type field of 3 are
access symbols. There are four kinds of access symbols on
the ring: vouchers, tickets, nulls, and aborts. These are
identified in Table 4.10 through 4.13.
Voucher:
Vouchers are sent by source nodes to obtain per-
mission to launch packets of client generated payload sym-
bols. QuickRing will send a voucher as soon as there is a
head and a data are loaded at the transmit port. Table 4.10
shows the format for a voucher. A Type field value of 3
indicating an access symbol and the ACCess field value of 1
indicates that the symbol is a voucher.
TABLE 4.10. Ring Port Voucher Field Format
Type F 31:30 29:28 27:24 23:20 19:16 15:12 11:8
7:4
3:0
3
0
[
0,1
]
Conn Srce
Trgt Hop 1 Hop 2 Hop 3 Hop 4 Hop 5
Ticket:
Tickets are returned by target nodes in response to
vouchers. They indicate that the target has reserved FIFO
space for one packet. QuickRing will send one packet upon
receipt of one ticket. The format for a ticket is shown in
Table 4.11. As in all access symbols, the type filed has a
value of 3. In tickets, a value of 2 in the ACCess indicates
that the symbol is in fact a ticket.
TABLE 4.11. Ring Port Ticket Field Format
Type F 31:30 29:28 27:24 23:20 19:16 15:12 11:8
7:4
3:0
3
0
[
1,0
]
Conn Srce
Trgt Hop 1 Hop 2 Hop 3 Hop 4 Hop 5
Null:
Null symbols are sent to consume idle time on the ring.
The symbol format is shown in Table 4.12. When ever a
controller does not have any payload or other access sym-
bol to send, it will send a null symbol at its downstream port.
TABLE 4.12. Ring Port Null Field Format
T(1:0)
F
31:30
29:0
3
1
3
XXX
Abort:
An abort symbol is sent by any node that detects a
failure of addressing, protocol, or data integrity during nor-
mal operation the QuickRing ring. The symbol format is
shown in Table 4.13.
TABLE 4.13. Ring Port Abort Field Format
T(1:0)
F
31:30
29:18
3
0
0
XXX
21
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