The ARM926PXP development chip contains a PrimeCell Smart Card Interface (SCI) controller.
A Smart Card connector (J10) is fitted to the underside of the board. There are solder pads that can be used for a smaller connector (J9) in place of the larger connector. Figure 3.27 shows the tristate buffers that are used to provide the interface between the SCI and the card.
You can set the Smart Card interface voltage to operate at 5V, 3.3V or 1.8V by setting jumpers on J11.
Connect pins AB for 3.3V operation
Connect pins CB for 5V operation
omit the link for 1.8V operation.
The default setting is linking pins AB. Both 3.3V and dual-voltage 3.3V/5V cards will function with this setting.
The Smart card VCC is switched on and off by the SCIVCCEN signal from the PrimeCell.
See also Smart Card Interface, SCI and the SCI PrimeCell PL131 Technical Reference Manual.
|SCICLKOUT||PrimeCell SCI clock.|
|nSCICLKEN||Tristate output buffer control for clock (active LOW).|
|SC_CLK||Clock output to card.|
|nSCIDATAEN||Tristate control for external off-chip buffer (active LOW).|
|SCIDATAIN||PrimeCell SCI serial data input.|
|nSCIDATAOUTEN||Data output (typically drives an open-drain buffer and functions as a data enable, active LOW).|
|nSC_RST||Reset to card (active LOW).|
|SCIFCB||Function code bit, not used in Versatile/AB926EJ-S but for other products it is typically used in conjunction with nSCICARDRST.|
|SCIDETECT||Card detect signal from card interface device (active HIGH).|