pnx1700 NXP Semiconductors, pnx1700 Datasheet - Page 472
pnx1700
Manufacturer Part Number
pnx1700
Description
Connected Media Processor
Manufacturer
NXP Semiconductors
Datasheet
1.PNX1700.pdf
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Philips Semiconductors
Volume 1 of 1
PNX17XX_SER_1
Preliminary data sheet
2.7.1 BUF1DONE and BUF2DONE Interrupts
2.7.2 THRESH1_REACHED and THRESH2_REACHED Interrupts
2.4 Record or Message Size
2.5 Records or Messages Per Buffer
2.6 Stride
2.7 Interrupt Events
The number of samples per record is set by FGPO_REC_SIZE field. This is amount
of data that will be output after each record or message start event unless the
FGPO_CTL.VAR_LENGTH bit is set. If the FGPO_CTL.VAR_LENGTH bit is set the
length of a record or message is set by the value of the second 32-bit word read from
the header attached to the record or message.
Valid values are in the range of 2 to 2
Remark: The FGPI has a minimum message size of 2 or 3. See FGPI Module
specification for more information.
The number of records or messages per buffer is set by FGPO_SIZE register.
Valid values are in the range of 1 to 2
If the number of records or messages per buffer is greater than one, the address
stride has to be programmed into the FGPO_STRIDE register.
Output starts at a new location in the current buffer on each record or message start
event. After output starts a new address is generated by adding the contents of the
FGPO_STRIDE register to the previous starting address.
Care must be taken that FGPO_STRIDE is greater than or equal to
FGPO_REC_SIZE. Add 8 if either TSTAMP_SELECT or VAR_LENGTH bits are set.
The FGPO_IR_STATUS register contains status and interrupt event status. To
generate an interrupt to the TriMedia processor the corresponding FGPO_IR_ENA bit
must be set. To clear an interrupt event (acknowledge the interrupt) a ‘1’ must be
written to the corresponding FGPO_IR_CLR bit. The FGPO_IR_SET register can be
used to generate software interrupts.
When the number of records or messages output from a main memory buffer equals
the value in the FGPO_SIZE register an associated Buffer Done interrupt will be
generated.
Remark: This interrupt is generated when the FGPO Engine finishes sending the last
sample from the last record/message from the associated main memory buffer.
When FGPO_NRECn (the number of records or messages output from memory
buffer n) equals the contents of the FGPO_THRESHn register then the associated
THRESHn_REACHED bit will be set in the FGPO_IR_STATUS register.
Rev. 1 — 17 March 2006
Chapter 13: FGPO: Fast General Purpose Output
24
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© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
PNX17xx Series
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