4.38 Asynchronous Context Command Pointer Register

The asynchronous context command pointer register contains a pointer to the address of the first descriptor block that the TSB12LV26 accesses when software enables the context by setting the asynchronous context control register (see Section 4.37) bit 15 (run). See Table 4±28 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

 

 

 

 

 

Asynchronous context command pointer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

Asynchronous context command pointer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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:

Asynchronous context command pointer

 

 

 

 

 

 

 

 

Type:

 

 

Read/Write/Update

 

 

 

 

 

 

 

 

 

 

 

 

Offset:

 

 

18Ch

[ATRQ]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1ACh

[ATRS]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1CCh

[ArRQ]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1ECh

[ArRS]

 

 

 

 

 

 

 

 

 

 

 

 

Default:

XXXX XXXXh

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 4±28. Asynchronous Context Command Pointer Register Description

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BIT

FIELD NAME

 

TYPE

 

 

 

 

 

 

 

DESCRIPTION

 

 

 

 

 

 

 

 

 

 

 

31±4

descriptorAddress

RWU

Contains the upper 28 bits of the address of a 16-byte-aligned descriptor block.

 

 

 

 

 

 

 

 

 

 

 

 

3±0

 

 

Z

 

RWU

Indicates the number of contiguous descriptors at the address pointed to by the descriptor address. If

 

 

 

Z is 0, then it indicates that the descriptorAddress field (bits 31±4) is not valid.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4±36

Page 74
Image 74
Texas Instruments TSB12LV26 manual Asynchronous Context Command Pointer Register, Asynchronous context command pointer

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.