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T8207 Datasheet, PDF (113/158 Pages) Agere Systems – ATM Interconnect | |||
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Advance Data Sheet
September 2001
CelXpres T8207
ATM Interconnect
14 Registers (continued)
Table 88. TX PHY FIFO Routing 0 (TXPFR0) (017Ch)
Name
port_rte[31:16]
Bit Pos.
15:0
Type
RW
Reset
Description
0 Port Route [31:16]. Each bit in this field represents one of
16 queues from the 64 queues in the device, where the least signifi-
cant bit is queue 16, and the most significant bit is queue 31. These
64 queues are divided into sixteen groups of four queues each.
Except in a special case of sixteen ports, the four queues of each
group are divided between two PHY ports, as follows:
Group 0âqueues 0 to 3âports 0 and 1
Group 1âqueues 4 to 7âports 2 and 3
Group 2âqueues 8 to 11âports 4 and 5
Group 3âqueues 12 to 15âports 6 and 7
Group 4âqueues 16 to 19âports 8 and 9
Group 5âqueues 20 to 23âports 10 and 11
Group 6âqueues 24 to 27âports 12 and 13
Group 7âqueues 28 to 31âports 14 and 15
Group 8âqueues 32 to 35âports 16 and 17
Group 9âqueues 36 to 39âports 18 and 19
Group 10âqueues 40 to 43âports 20 and 21
Group 11âqueues 44 to 47âports 22 and 23
Group 12âqueues 48 to 51âports 24 and 25
Group 13âqueues 52 to 55âports 26 and 27
Group 14âqueues 56 to 59âports 28 and 29
Group 15âqueues 60 to 63âports 30 and 31
The bits in this field assign each queue in the group to either the odd-
or even-numbered PHY port in the group. If a bit is cleared to â0,â the
corresponding queue is assigned to the even-numbered port. If the
bit is set to â1,â the corresponding queue is assigned to the odd-num-
bered port. For eight PHY ports, where ports 0, 2, 4, 6, 8, 10, and 14
are used, this register is set to â0000000000000000,â ultimately
assigning 4 queues per port. For 32 PHY ports, if the device is con-
figured in normal 32-port mode, as described in Section 9.2.2, Out-
going ATM Mode (Cells Sent by T8207), and in Section 11.4,
Queuing, this register is programmed to â1010101010101010.â With
this setting, PHY port 8 is assigned queues 16 and 18, PHY port 9 is
assigned queues 17 and 19, PHY port 10 is assigned queues 20 and
22, PHY port 11 is assigned queues 21 and 23, and so on.
For the special case of sixteen ports, if the T8207_sel bit is set,
these bits are ignored, and each port is assigned all four queues in
the group. PHY 0 is assigned queue group 0, or queues 0, 1, 2, and
3, PHY 1 is assigned queue group 1, or queues 4, 5, 6, and 7, and so
on.
For sixteen PHY ports, if the T8207_sel bit is cleared, the sixteen
ports can only use queues 0 to 31, and the queues are shared
between odd- and even-numbered ports. In the normal 16-port
mode, as described in Section 9.2.2, Outgoing ATM Mode (Cells
Sent by T8207), and in Section 11.4, Queuing, this register is pro-
grammed to â1010101010101010.â With this setting, PHY port 8 is
assigned queues 16 and 18, PHY port 9 is assigned queues 17 and
19, PHY port 10 is assigned queues 20 and 22, PHY port 11 is
assigned queues 21 and 23, and so on.
Agere Systems Inc.
113
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