QSPI

QSPI is an enhanced version of SPI, with improvements in the data transfer rate. The data lines of QSPI are bidirectional and operate in parallel.

QSPI is widely used in LCD interfaces and computer peripheral devices, providing an efficient solution for data transmission.

QSPI is commonly employed in communication with LCD interfaces to achieve high-speed transmission of image data. Additionally, QSPI is extensively used in computer peripheral devices. QSPI typically utilizes three main signal lines: CS (Chip Select) for selecting the device for communication, CLK (Clock) for synchronizing data transmission, and DATA for the actual data transmission line.

The operating voltage of QSPI depends on the specifications of the corresponding integrated circuit (IC). Therefore, specific voltage requirements and characteristics will vary based on the IC used and the relevant application scenarios.

It is worth noting that when QSPI is applied to SPI Flash, it is recommended to use Serial Flash bus decode to ensure correct decoding and communication. Moreover, QSPI supports Single(1), Dual(2), Quad(4), and Octal(8) I/O modes, providing greater flexibility to adjust I/O modes according to specific needs to achieve higher transmission speeds and performance.

Logic Analyzer

TL4234B

TL4000 series Specifications PDF

QSPI Decode

Save as TXT/CSV

In Logic Analyzer mode, click the icon above the report area to save the decoded data as a TXT/CSV file.

QSPI Decoding Setup Steps

1. Click Quick Settings or Add Protocol Decode to select a protocol for logic analyzer capture.

2. Select QSPI for decoding.

3. If you use Quick Settings, the system will recommend configurations for trigger type, sampling rate, voltage threshold, and channel settings.

4. Click the icon to access the Decode Settings screen.

QSPI Decode Settings

Channel:

CS: Capture data when CS edge is falling.

CLK: Clock channel.

D0-D7: Customizable data channel.

Significant Bit(D0): D0 is the MSB or LSB of the data arrangement,

1. Take Bus Width = 4 MSB as an example, the Byte combination is
   D0 D1 D2 D3 D0 D1 D2 D3
2. Take Bus Width = 4 LSB as an example, the Byte combination is
   D3 D2 D1 D0 D3 D2 D1 D0

Latch Edge: Rising/Falling/Both can be selected as the data collection location.

Bus Width: Optional data 1, 2, 4, 8 lines.

Report Column: Report presentation mode, 8/16 fields can be selected.

QSPI Decoding Example