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T8207 Datasheet, PDF (114/158 Pages) Agere Systems – ATM Interconnect | |||
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CelXpres T8207
ATM Interconnect
Advance Data Sheet
September 2001
14 Registers (continued)
Table 89. TX PHY FIFO Routing 1 (TXPFR1) (017Eh)
Name
Bit Pos.
port_rte[15:0] 15:0
Type
RW
Reset
Description
0 Port Route [15:0]. Port Route [15:0]. Each bit in this field repre-
sents one of 16 queues from the 64 queues in the device, where the
least significant bit is queue 0, and the most significant bit is queue
15. 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-numbered 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 configured in normal 32-port mode, as described in Sec-
tion 9.2.2, Outgoing ATM Mode (Cells Sent by T8207), and in Sec-
tion 11.4, Queuing, this register is programmed to
â1010101010101010.â With this setting, PHY port 0 is assigned
queues 0 and 2, PHY port 1 is assigned queues 1 and 3, PHY port 2
is assigned queues 4 and 6, PHY port 3 is assigned queues 5 and
7, 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 0 is
assigned queues 0 and 2, PHY port 1 is assigned queues 1 and 3,
PHY port 2 is assigned queues 4 and 6, PHY port 3 is assigned
queues 5 and 7, and so on.
114
Agere Systems Inc.
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