SAA8200HL Datasheet, PDF (27/71 Pages) NXP Semiconductors – Ensation Base integrated wireless audio baseband

Philips Semiconductors
SAA8200HL
Ensation Base integrated wireless audio baseband
The watchdog timer in the SAA8200HL can be used as follows:
• As watchdog, the M1 output is used for generating an event to the CGU, which
requests a reset.
• As timer, the M0 output is used for generating an event to the event router, which
generates an interrupt to the interrupt controller.
• As watchdog and as timer, the value of the MCR0 has to be lower than the value of
MCR1 (otherwise unwanted resets could be generated by the CGU).
7.9 Reed-Solomon codec
The Reed-Solomon codec is an essential part of the baseband IC. It allows redundancy to
be added to the transmitted bits so that transmission errors can be corrected at the
receiving end. The Reed-Solomon codec will provide some flexibility to the customer to
choose packet length. For SBC based applications the Reed-Solomon block length will be
such that it contains one or two SBC-encoded audio frames.
The Reed-Solomon codec is a hardware block that makes use of a locally attached
memory for I/O, work space and temporary storage. The communication between this
local RAM and the EPICS7B X-memory space will happen via the external DMA
controller.
Features:
• 8-bit; 1-byte symbols
• 256-byte blocks
• 16 parity bytes
• No interleaving (for latency reduction)
• Automatic zero insertion (virtual zero padding).
7.10 Event router
This module can be used in low power systems to request power-up or start a clock on an
external or internal event. It can also be used to generate interrupts as a result:
• Provides bus-controlled routing of input events to multiple outputs for use as interrupts
or wake-up signals
• Input events can be used either directly or latched (edge detected) as an interrupt
source:
– Direct interrupts will disappear when the event becomes inactive
– Latched interrupts will remain active until they are explicitly cleared.
• Interrupt events can be inverted (programmable)
• Each interrupt can be masked on event level
• Interrupt event detect status can be read per interrupt type
• Interrupt detection is fully asynchronous (no active clock required).
The event router provides bus control over the interrupt system. The event sources can be
defined, their polarity and activation type selected, also each input can be routed to any
output(s) at reset.
SAA8200HL_2
Preliminary data sheet
Rev. 02 — 17 October 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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