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3.14. Smart card interface, SCI

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.

Figure 3.27. SCI block diagram

SCI block diagram

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.

Table 3.14. Smart Card interface signals
SCICLKOUTPrimeCell SCI clock.
nSCICLKENTristate output buffer control for clock (active LOW).
SC_CLKClock output to card.
nSCIDATAENTristate control for external off-chip buffer (active LOW).
SCIDATAINPrimeCell SCI serial data input.
nSCIDATAOUTENData output (typically drives an open-drain buffer and functions as a data enable, active LOW).
nSC_RSTReset to card (active LOW).
SCIFCBFunction code bit, not used in Versatile/AB926EJ-S but for other products it is typically used in conjunction with nSCICARDRST.
SCIDETECTCard detect signal from card interface device (active HIGH).

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