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參數資料
| 型號： | TSB41BA3-EP |
| 英文描述： | IC APEX 20KE FPGA 400K 672-FBGA |
| 中文描述： | 軍事增強塑料的IEEE 1394b三端口電纜收發(fā)器/仲裁器 |
| 文件頁數： | 26/50頁 |
| 文件大小： | 662K |
| 代理商： | TSB41BA3-EP |
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SLLS418G
–
JUNE 2000
–
REVISED JANUARY 2003
26
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
using the TSB41AB3 with a non-1394a-2000 link layer (continued)
The 1394a-2000 Supplement includes enhancements to the Annex J interface that must be comprehended
when using the TSB41AB3 with a non-1394a-2000 LLC device.
A new LLC service request was added which allows the LLC to temporarily enable and disable
asynchronous arbitration accelerations. If the LLC does not implement this new service request, the
arbitration enhancements is not enabled (see the EAA bit in PHY register 5).
The capability to perform multispeed concatenation (the concatenation of packets of differing speeds) was
added in order to improve bus efficiency (primarily during isochronous transmission). If the LLC does not
support multispeed concatenation, multispeed concatenation is not enabled in the PHY (see the EMC bit
in PHY register 5).
In order to accommodate the higher transmission speeds expected in future revisions of the standard,
1394a-2000 extended the speed code in bus requests from 2 bits to 3 bits, increasing the length of the bus
request from 7 bits to 8 bits. The new speed codes were carefully selected so that new 1394a-2000 PHY
and LLC devices would be compatible, for speeds from S100 to S400, with legacy PHY and LLC devices
that use the 2-bit speed codes. The TSB41AB3 correctly interprets both 7-bit bus requests (with 2-bit speed
code) and 8-bit bus requests (with 3-bit speed codes). Moreover, if a 7-bit bus request is immediately
followed by another request (e.g., a register read or write request), the TSB41AB3 correctly interprets both
requests. Although the TSB41AB3 correctly interprets 8-bit bus requests, a request with a speed code
exceeding S400 results in the TSB41AB3 transmitting a null packet (data-prefix followed by data-end, with
no data in the packet).
More explanation is included in the TI application note
IEEE 1394a-2000 Features Supported by TI TSB41LV0X
Physical Layer Devices,
TI literature number SLLA019.
using the TSB41AB3 with a lower-speed link layer
Although the TSB41AB3 is an S400-capable PHY, it may be used with lower speed LLCs, such as the S200
capable TSB12LV31. In such a case, the LLC has fewer data terminals than the PHY, and some Dn terminals
on the TSB41AB3 are not used. Unused Dn terminals are pulled to ground through 10-k
resistors.
The TSB41AB3 transfers all received packet data to the LLC, even if the speed of the packet exceeds the
capability of the LLC to accept it. Some lower speed LLC designs do not properly ignore packet data in such
cases. On the rare occasions that the first 16 bits of partial data accepted by such a LLC match a node
’
s bus
and node ID, spurious header CRC or tcode errors may result.
During bus initialization following a bus-reset, each PHY transmits a self-ID packet that indicates, among other
information, the speed capability of the PHY. The bus manager (if one exists) builds a speed map from the
collected self-ID packets. This speed map gives the highest possible speed that can be used on the
node-to-node communication path between every pair of nodes in the network.
In the case of a node consisting of a higher-speed PHY and a lower-speed LLC, the speed capability of the node
(PHY and LLC in combination) is that of the lower-speed LLC. A sophisticated bus manager may be able to
determine the LLC speed capability by reading the configuration ROM Bus_Info_Block or by sending
asynchronous request packets at different speeds to the node and checking for an acknowledge; the speed map
may then be adjusted accordingly. The speed-map should reflect that communication to such a node must be
done at the lower speed of the LLC, instead of the higher speed of the PHY. However, speed map entries for
paths that merely pass through the node
’
s PHY, but do not terminate at that node, are not restricted by the lower
speed of the LLC.
相關PDF資料 |
PDF描述 |
|---|---|
| TSB41LV03PFP | IC APEX 20KE FPGA 600K 652-BGA |
| TSB41AB2I | IEEE 1394a-2000 TWO-PORT CABLE TRANSCEVER/ARBITER |
| TSB41LV03AI | IEEE 1394a THREE-PORT CABLE TRANSCEIVER/ARBITER |
| TSC692E | 672-pin FineLine BGA |
| TSC695F | IC,FPGA,57120-CELL,CMOS,BGA,1020PIN,PLASTIC |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TSB41BA3IPFP | 制造商:Rochester Electronics LLC 功能描述:1394B-2002 3-PORT PHYSICAL LAYER DEVICE - Bulk 制造商:Texas Instruments 功能描述:CBL TRNSCVR 6TR 6TX 6RX 80HTQFP - Trays |
| TSB41BA3PFP | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述:CBL TRNSCVR 6TR 6TX 6RX 80HTQFP - Trays |
| TSB41LV01 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:IEEE 1394A ONE-PORT CABLE TRANSCEIVER/ARBITER |
| TSB41LV01PAP | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
| TSB41LV02 WAF | 制造商:Texas Instruments 功能描述: |
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