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參數(shù)資料
| 型號： | TSB12C01AWN |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | High-Speed Serial-Bus Link-Layer Controller |
| 中文描述： | 高速串行總線鏈路層控制器 |
| 文件頁數(shù)： | 49/59頁 |
| 文件大?。?/td> | 275K |
| 代理商： | TSB12C01AWN |
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7–1
7 TSB12C01A to 1394 Phy Interface Specification
7.1
Introduction
This chapter provides an overview of a TSB12C01A to the phy interface. The information that follows can
be used as a guide through the process of connecting the TSB12C01A to a 1394 physical-layer device. The
part numbers referenced, the TSB11C01 and the TSB12C01A, represent the Texas Instruments
implementation of the phy (TSB11C01) and link (TSB12C01A) layers of the IEEE 1394-1995 standard.
The specific details of how the TSB11C01 device operates is not discussed in this document. Only those
parts that relate to the TSB12C01A phy-link interface are mentioned.
7.2
The TSB12C01A is capable of supporting 100 Mb/s, 200 Mb/s and 400 Mb/s phy-layer devices. For that
reason, this document describes an interface to a 400-Mb/s (actually 393.216-Mb/s) device. To support
lower-speed phy layers, adjust the width of the data bus by two terminals per 100 Mb/s. For example, for
100-, 200- and 400-Mb/s devices, the data bus is 2, 4, and 8 bits wide respectively. The width of the CTL
bus and the clock rate between the devices, however, does not change regardless of the transmission speed
that is used.
Assumptions
Finally, the 1394 phy layer has control of all bidirectional terminals that run between the phy layer and
TSB12C01A. The TSB12C01A can drive these terminals only after it has been given permission by the phy
layer. A dedicated request terminal (LREQ) is used by the TSB12C01A for any activity that the designer
wishes to initiate.
7.3
The functional block diagram of the TSB12C01A to phy layer is shown in Figure 7–1.
Block Diagram
ISO
ISO
D0 – D7
CTL0 – CTL1
LREQ
SCLK
1394
Link
Layer
1394
Phy-Layer
Device
TSB12C01A
NOTE A: See Table 2–2 for signal definition.
Figure 7–1. Functional Block Diagram of the TSB12C01A to Phy Layer
7.4
The four operations that can occur in the phy-link interface are request, status, transmit, and receive. With
the exception of the request operation, all actions are initiated by the phy layer.
Operational Overview
The CTL0 – CTL1 bus is encoded as shown in the following sections.
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