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| 型号： | TSB41BA3AIGGM |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | IEEE 1394b THREE-PORT CABLE TRANSCEIVER/ARBITER |
| 中文描述： | 的IEEE 1394b三端口电缆收发器/仲裁者 |
| 文件页数： | 34/66页 |
| 文件大小： | 895K |
| 代理商： | TSB41BA3AIGGM |
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SLLS618B JUNE 2004 REVISED AUGUST 2004
34
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
crystal selection (continued)
C9
C10
X1
Figure 11. Recommended Crystal and Capacitor Layout
It is strongly recommended that part of the verification process for the design be to measure the frequency of
the PCLK output of the PHY. This should be done with a frequency counter with an accuracy of six digits or better.
If the PCLK frequency is more than the crystal’s tolerance from 49.152 MHz or 98.304 MHz, then the load
capacitance of the crystal may be varied to improve frequency accuracy. If the frequency is too high, add more
load capacitance; if the frequency is too low, decrease the load capacitance. Typically, changes must be done
to both load capacitors (C9 and C10 above) at the same time, and both must be of the same value. Additional
design details and requirements may be provided by the crystal vendor.
bus reset
It is recommended, that whenever the user has a choice, the user should initiate a bus reset by writing to the
initiate short bus reset (ISBR) bit (bit 1 PHY register 0101b). Care must be taken to not change the value of any
of the other writeable bits in this register when the ISBR bit is written to.
In the TSB41BA3A, the initiate bus reset (IBR) bit may be set to 1 in order to initiate a bus reset and initialization
sequence, however, it is recommended to use the ISBR bit instead. The IBR bit is located in PHY register 1 along
with the root-holdoff (RHB) bit and gap-count register. As required by the 1394b Supplement this configuration
maintains compatibility with older Texas Instruments PHY designs which were based upon either the suggested
register set defined in Annex J of IEEE Std 1394-1995 or the 1394a-2000 Supplement. Therefore, whenever
the IBR bit is written, the RHB bit and gap-count are also necessarily written.
It is recommended that the RHB bit and gap-count only be updated by PHY configuration packets. The
TSB41BA3A is 1394a and 1394b compliant, and therefore both the reception and transmission of PHY
configuration packets cause the RHB and gap-count to be loaded, unlike older IEEE Std 1394-1995 compliant
PHYs which decode only received PHY configuration packets.
The gap-count is set to the maximum value of 63 after two consecutive bus resets without an intervening write
to the gap-count, either by a write to PHY register 1 or by a PHY configuration packet. This mechanism allows
a PHY configuration packet to be transmitted and then a bus reset to be initiated so as to verify that all nodes
on the bus have updated their RHB bits and gap-count values, without having the gap-count set back to 63 by
the bus reset. The subsequent connection of a new node to the bus, which initiates a bus reset, then causes
the gap-count of each node to be set to 63. Note, however, that if a subsequent bus reset is instead initiated
by a write to register 1 to set the IBR bit, then all other nodes on the bus have their gap-count values set to 63,
while this node’s gap-count remains set to the value just loaded by the write to PHY register 1.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TSB41BA3AIPFP | 功能描述:缓冲器和线路驱动器 Three-Port Cable Xcvr/Arbiter RoHS:否 制造商:Micrel 输入线路数量:1 输出线路数量:2 极性:Non-Inverting 电源电压-最大:+/- 5.5 V 电源电压-最小:+/- 2.37 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Reel |
| TSB41BA3APFP | 功能描述:缓冲器和线路驱动器 Three-Port Cable Xcvr/Arbiter RoHS:否 制造商:Micrel 输入线路数量:1 输出线路数量:2 极性:Non-Inverting 电源电压-最大:+/- 5.5 V 电源电压-最小:+/- 2.37 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Reel |
| TSB41BA3APFPG4 | 功能描述:1394 接口集成电路 Three-Port Cable Xcvr/Arbiter RoHS:否 制造商:Texas Instruments 类型:Link Layer Controller 工作电源电压: 封装 / 箱体:LQFP 封装:Tray |
| TSB41BA3ATPFPEP | 功能描述:缓冲器和线路驱动器 Mil Enh 3-Port Cable Xcvr/Arbiter RoHS:否 制造商:Micrel 输入线路数量:1 输出线路数量:2 极性:Non-Inverting 电源电压-最大:+/- 5.5 V 电源电压-最小:+/- 2.37 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Reel |
| TSB41BA3B | 制造商:TI 制造商全称:Texas Instruments 功能描述:IEEE 1394b THREE-PORT CABLE TRANSCEIVER/ARBITER |
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