UCB1510DB Просмотр технического описания (PDF) - Philips Electronics

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UCB1510DB

AC97 digital modem codec

Philips Electronics 

Philips Semiconductors

UCB1510

AC97 digital modem codec

13. General purpose I/O

The UCB1510 has 8 programmable digital input/output (I/O) pins. These pins can be

independently programmed for polarity, value, direction and interrupt through the

GPIO control registers.

14. Interrupt generation

The UCB1510 contains a programmable interrupt control block.

The internal interrupt signal presents the 'OR' function of all interrupt status bits and

can be used to give an interrupt to the system controller using the AClink interrupt

protocol

The interrupt controller is implemented asynchronously. This provides the possibility

to generate interrupts when BIT_CLK is stopped, e.g. an interrupt can be generated

in power down mode, when the state of one of the IO pins changes (e.g. ring detect).

15. Reset circuit and mode selection

The AC97 specification rev 2.1 describes a number of states and reset functions for a

modem codec either in primary or secondary codec.

15.1 Resets

15.1.1 Pulling the PON pin LOW

The PON pin acts as a hardware reset and is typically connected to a power

detection circuit.

15.1.2 Activating the RESET pin

Pulling the RESET pin low will start a cold or a warm reset sequence.

If the circuit is active (MLNK = 0). A cold reset is started. The reset sequence will end

after the rising edge of RESET. Only then will the AClink be available. Vendor test

modes are inactive as soon as the reset sequence starts so that mode sensing is

possible.

If the MLNK bit is set when the RESET pin is pulled low, a warm reset is activated

when RESET goes high again.

15.1.3 Activating the SYNC pin when AClink is inactive

When the AClink is not active (no BIT_CLK present), a rising SYNC will cause a

warm reset.

15.1.4 Writing reg 0x3C

When written, the reg 0x3C will initiate a register reset. All registers are set to their

default values.

9397 750 06856

Preliminary specification

Rev. 01 — 4 February 2000

© Philips Electronics N.V. 2000. All rights reserved.

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