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參數(shù)資料
| 型號(hào)： | PM73488 |
| 廠商： | PMC-SIERRA INC |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | 5 Gbit/s ATM Switch Fabric Element |
| 中文描述： | ATM SWITCHING CIRCUIT, PBGA596 |
| 封裝： | EPBGA-596 |
| 文件頁(yè)數(shù)： | 105/135頁(yè) |
| 文件大?。?/td> | 1735K |
| 代理商： | PM73488 |
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PMC-Sierra, Inc.
PM73488 QSE
L
PMC-980616
Issue 3
5 Gbit/s ATMSwitch Fabric Element
Released
Datasheet
107
Format: Refer to the following table.
9.3.26
SWITCH_FABRIC_ROW
Address: 84
h
Type: Read/Write
Field (Bits)
Description
UNICAST_AGG_OUT
(2:0)
Selects aggregate of N. N consecutive outputs are treated as a single output by
the switch for unicast traffic.
(2:0) = 6 - 7 are invalid.
(2:0) = 5 puts in the QSE in randomization mode.
(2:0) = 4, N = 16.
(2:0) = 3, N = 8.
(2:0) = 2, N = 4.
(2:0) = 1, N = 2.
(2:0) = 0, N = 1.
Note that this register determines whether the QSE is in
randomization
mode
or
switching
mode: when bits (2:0) have the value 5 then the QSE is in
randomization mode, and when bits (2:0) have a value between 4 and 0 then
the QSE is in switching mode. Thus, for example, in a 3-stage switch fabric,
all the QSEs in the 1st stage should have UNICAST_AGG_OUT set to 5, and
all the QSEs in the 2nd and 3rd stage should have UNICAST_AGG_OUT set
to values between 4 and 0. The rationale behind this encoding is that
randomization mode may be viewed as switching mode with N = 32, because
in randomization mode a unicast cell is "switched" to any of the 32 output
ports.
Note that "aggregate mode" is also called "gang mode" in other parts of this
document.
Note: The multicast output gang mode (see section “9.3.24
MULTICAST_AGGREGATE_OUTPUT_AND_INPUT_MODES” on page
105) must be set to a value less than or equal to the unicast output gang mode
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