STPCINDUSTRIAL datasheet(15/55 Pages) STMICROELECTRONICS

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STRAP OPTION

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Issue 1.1

2.1.5 STRAP REGISTER 4 INDEX 3Dh (STRAP4)

Bits 5-0 of this register reflect the status of pins MD[53:48] respectively.

They are use by the chip as follows:

Bits 7-5 Reserved.

Bit 4, y.y V present on board. This bit reflects the value sampled on MD[52] pin and is used to notify the

Cardbus socket management unit if the y.y V vcc voltage (where y.y is less than x.x) is present on board

as follows

Setting to ’0’, y.y V Vcc voltage is not available

Setting to ’1’: y.y V Vcc voltage is available.

Bit 3, x.x V present on board. This bit reflects the value sampled on MD[51] pin and is used to notify the

Cardbus socket management unit if the x.x V vcc voltage (where x.x is less than 3.3) is present on board

as follows:

Setting to ’0’, x.x V Vcc voltage is not available.

Setting to ’1’: x.x V Vcc voltage is available.

Bit 2, 3.3 V present on board. This bit reflects the value sampled on MD[50] pin and is used to notify the

Cardbus socket management unit if the 3.3 V vcc voltage is present on board as follows:

Setting to ’0’, 3.3 V vcc voltage is not available.

Setting to ’1’, 3.3 V vcc voltage is available.

Bit 1, 5 V present on board. This bit reflects the value sampled on MD[49] pin and is used to notify the

Cardbus socket management unit if the 5 V vcc voltage is present on board as follows:

Setting to ’0’, 5 V vcc voltage is not available.

Setting to ’1’, 5 V vcc voltage is available.

Bit 0, This bit reflects the value sampled on MD[48] pin and is used to enable the TFT controller outputs

on pads RFU0-RFU11 as follows:

RFU0 : R[2]

RFU1 : R[3]

RFU2 : R[4]

RFU3 : R[5]

RFU4 : G[2]

RFU5 : G[3]

RFU6 : G[4]

RFU7 : G[5]

RFU8 : B[2]

RFU9 : B[3]

RFU10 : B[4]

RFU11 : B[5]

This register defaults to the values sampled on MD[53:48] pins after reset.

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