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參數(shù)資料
| 型號(hào)： | PM73488-PI |
| 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)： | 96/135頁(yè) |
| 文件大小： | 1735K |
| 代理商： | PM73488-PI |
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PMC-Sierra, Inc.
PM73488 QSE
L
PMC-980616
Issue 3
5 Gbit/s ATMSwitch Fabric Element
Released
Datasheet
98
Format: Refer to the following table.
9.3.8
MULTICAST_GROUP_INDEX_MSB
Address: C
h
Type: Read/Write
Format: Refer to the following table.
9.3.9
INPUT_PORT_ENABLE
Address: 10-13
h
Field (Bits)
Description
Not used
(7)
Write with a 0 to maintain future software compatibility.
RAM_PARITY_ERR_SENSED
(6)
1: A parity error was sensed in the external multicast RAM
0: No parity error was sensed or parity is not enabled
RAM_PARITY_INT_ENABLE
(5)
1: Enable interrupt on External Multicast Vector RAM parity error
0: No interrupt on RAM parity error
RAM_PARITY_ENABLE
(4)
1: Enable parity checking for the external multicast vector RAM
0: Disable parity checking for the external multicast vector RAM
Not used
(3:1)
Write with a 0 to maintain future software compatibility.
SHORT_TAG_ENABLE
1: Rotate only 5 nibbles of the routing tag.
0: Rotate all 8 nibbles of the routing tag.
When the QSE receives a unicast cell, it looks at the initial portion of the
cell’s routing tag, and interprets it to be the destination gang of the cell.
Before sending the cell out on that destination, the QSE cyclically shifts the
routing tag leftwards. The purpose of this shift is to move new bits into the
initial portion of the routing tag, thus making the routing tag suitable for use
by the next-stage QSE. The amount of the rotation is equal to (5 - UC output
gang mode) bits. (For a discussion on UC output gang mode, see section
“9.3.25 UNICAST_AGGREGATE_OUTPUT_MODE” on page 106.)
If SHORT_TAG_ENABLE is set to 1, then only 5 nibbles are rotated. Hence,
the last 3 nibbles are left untouched, and they could potentially be used by the
traffic manager to send diagnostic information. The QRT currently does not
*NOT* use these 3 nibbles for anything. Therefore, when the QSE is used in
conjunction with the QRT, there is no advantage to short tags, and the
SHORT_TAG_ENABLE bit may remain at the reset-default value of 0.
Field (Bits)
Description
MGI_MSB
(1:0)
Bits 17 and 16 of the multicast group index. Use along with the
MULTICAST_GROUP_INDEX_REGISTER
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PDF描述 |
|---|---|
| PM73488 | 5 Gbit/s ATM Switch Fabric Element |
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| PM7350 | Dual Serial Link, PHY Multiplexer |
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