STLC2410B

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9

HCI USB TRANSPORT LAYER

munication between a host controller (STLC2410B) and a host (e.g. PC), via a USB interface. The USB

Transport Layer is completely implemented in SW. It accepts HCI messages from the HCI Layer, prepares

it for transmission over a USB bus, and sends it to the USB Driver. It reassembles the HCI messages from

USB data received from the USB Driver, and sends these messages to the HCI Layer. The Transport Lay-

er does not interprete the contents (payload) of the HCI messages; it only examines the header.

10

POWER CLASS1 SUPPORT

The chip can control an external power amplifier (PA). Several signals are duplicated on GPIOs for this

purpose in order to avoid digital/analog noise loops in the radio.

The Class1_En register enables the alternate functions of GPIO[15:6] to generate the signals for driving

Every bit enables a dedicated signal on a GPIO pin, as described in Table 11 : Power Class 1 functionality.

Table 11. Power Class 1 functionality

rx_on is the same as the rx_on output pin. Not rx_on is the inverted signal, in order to save components

on the application board.

PA7 to PA0 are the power amplifier control lines. They are managed, on a connection basis, by the base-

Class1_En bit

involved GPIO

description (when class1_En bit = ‘1’)

rxon

gpio[6]

outputs a copy of rx_on pin to switch LNA/RF switch on/off

not rxon

gpio[7]

outputs an inverted copy of rx_on pin to switch LNA/RF switch on/off

PA0

gpio[8]

Bit 0 of the PA value for the current connection

PA1

gpio[9]

Bit 1 of the PA value for the current connection

PA2

gpio[10]

Bit 2 of the PA value for the current connection

PA3

gpio[11]

Bit 3 of the PA value for the current connection

PA4

gpio[12]

Bit 4 of the PA value for the current connection

PA5

gpio[13]

Bit 5 of the PA value for the current connection

PA6

gpio[14]

Bit 6 of the PA value for the current connection

PA7

gpio[15]

Bit 7 of the PA value for the current connection