ATXP032 datasheet(14/113 Pages) DIALOG

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ATXP032

DS-ATXP032–114I–4-2020

Data Strobe (DS): This is a device-to-host signal and is output only. DS operates in push-pull mode and is the

return of the clock signal.

In SDR mode, DS is driven high in the first half of the data output cycle, and low in the second half. In this

mode, DS is basically be the inverse of SCK, but with a delay. If SCK is low at the end of an operation, DS is

high. This is the recommended mode of operation in SDR mode. However, if the host controller requires DS

to end low to be able to use this signal correctly, it is also possible to add half of an SCK pulse and end with

SCK high and DS low.

In DDR mode, DS changes value at the edge of each data bit. In this mode, DS is basically be the same

value as SCK, but with a delay. As SCK is driven low by the master at the end of a command sequence, DS

remains low until CS is driven high again. DS is primarily required for fast operation in DDR mode, but is

available in other modes as well.

I/O

7-0: Data lines are bidirectional signals. Host and device drivers are operating in push-pull mode. In octal

mode, I/O

7-4 are used together with I/O3-0 as bidirectional I/O pins. In these modes, the I/O pins is placed in

the high-impedance (high-Z) state whenever the device is deselected (CS is deasserted).

Figure 6-2.

Octal Interface Bus Circuitry Diagram

6.2.2

Programmable Device Output Driver

The bus capacitance of each line of the octal interface bus is the sum of the bus master capacitance, the bus

capacitance itself and the capacitance of each inserted device. The sum of host and bus capacitance are fixed for

one application, but may vary between different applications. The device load may vary in one application with

each of the inserted devices.

The IOD2:0 bits in the I/O Pin Drive Strength Control Register are used to configure the output driver strength.

Host

Device

I/O

7-0

SCK

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