4.31 Isochronous Cycle Timer Register

The isochronous cycle timer register indicates the current cycle number and offset. When the TSB12LV26 is cycle master, this register is transmitted with the cycle start message. When the TSB12LV26 is not cycle master, this register is loaded with the data field in an incoming cycle start. In the event that the cycle start message is not received, the fields can continue incrementing on their own (if programmed) to maintain a local time reference. See Table 4±22 for a complete description of the register contents.

Bit

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Name

 

 

 

 

 

 

Isochronous cycle timer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type

RWU

RWU

RWU

RWU

RWU

RWU

RWU

RWU

RWU

RWU

RWU

RWU

RWU

RWU

RWU

RWU

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

Bit

15

 

14

13

12

11

 

10

 

9

8

7

6

5

4

 

3

2

1

0

Name

 

 

 

 

 

 

 

 

 

 

 

Isochronous cycle timer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type

RWU

 

RWU

RWU

RWU

RWU

 

RWU

 

RWU

RWU

RWU

 

RWU

RWU

RWU

 

RWU

RWU

RWU

RWU

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default

X

 

X

 

X

X

 

X

 

X

 

X

X

X

 

X

X

X

 

X

X

X

X

 

 

Register:

Isochronous cycle timer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type:

 

Read/Write/Update

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Offset:

 

F0h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default:

XXXX XXXXh

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 4±22. Isochronous Cycle Timer Register Description

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BIT

 

FIELD NAME

 

TYPE

 

 

 

 

 

 

 

 

DESCRIPTION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

31±25

 

cycleSeconds

 

RWU

This field counts seconds [rollovers from bits 24±12 (cycleCount field)] modulo 128.

 

 

 

 

 

 

 

 

 

 

24±12

 

cycleCount

 

RWU

This field counts cycles [rollovers from bits 11±0 (cycleOffset field)] modulo 8000.

 

 

 

 

 

 

 

 

 

 

 

11±0

 

cycleOffset

 

RWU

This field counts 24.576-MHz clocks modulo 3072, i.e., 125 ∝s. If an external 8-kHz clock configuration

 

 

is being used, then this bit must be cleared to 0 at each tick of the external clock.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4±27

Page 64 Page 66
Page 65
Image 65
Texas Instruments TSB12LV26 manual Isochronous Cycle Timer Register, Isochronous cycle timer, 24±12
Page 64 Page 66

TSB12LV26 specifications

The Texas Instruments TSB12LV26 is a high-performance, low-voltage transceiver designed for Serial Bus applications. It is widely recognized for its robust features and versatility, making it a popular choice among engineers and designers in various industries. One of the primary features of the TSB12LV26 is its support for high-speed data transmission, enabling it to operate at speeds up to 400 Mbps. This capability is essential for applications that demand rapid data transfer, such as in multimedia and communication systems.

The TSB12LV26 is part of the IEEE 1394 standard, also known as FireWire, which is widely used for connecting devices like digital cameras, external hard drives, and printers. The chip operates within a voltage range of 2.7V to 3.6V, making it suitable for low-power applications where energy efficiency is critical. The integration of advanced Low-Voltage Differential Signaling (LVDS) technology within the TSB12LV26 enhances signal integrity and reduces electromagnetic interference, resulting in more reliable performance over longer distances.

In terms of its physical characteristics, the TSB12LV26 is available in a compact 48-pin HTQFP package, which is beneficial for space-constrained designs. The device features a comprehensive set of input and output pins, allowing for flexible connectivity options. Additionally, the TSB12LV26 includes advanced power management features, including low-power modes that help extend battery life in portable devices.

Another significant advantage of the TSB12LV26 is its capability for peer-to-peer communication, enabling devices to connect and communicate directly without the need for a central controller. This functionality supports a wide range of device configurations and simplifies system architecture. Furthermore, the transceiver offers built-in support for asynchronous and isochronous data transfer, making it adaptable for various application requirements.

The TSB12LV26 also adheres to stringent EMI and ESD protection standards, ensuring reliable operation in challenging environments. With a rich feature set, excellent performance characteristics, and compliance with industry standards, the Texas Instruments TSB12LV26 remains an ideal choice for engineers looking to implement high-speed and reliable communication in their designs. Overall, it represents a significant advancement in the field of data transmission technology, making it a preferred component for numerous electronic applications.
Top Page Image Contents