PNX1701EH,557 NXP Semiconductors, PNX1701EH,557 Datasheet - Page 501
PNX1701EH,557
Manufacturer Part Number
PNX1701EH,557
Description
Manufacturer
NXP Semiconductors
Datasheet
1.PNX1701EH557.pdf
(832 pages)
Specifications of PNX1701EH,557
Operating Temperature (min)
0C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Lead Free Status / Rohs Status
Not Compliant
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Philips Semiconductors
Volume 1 of 1
PNX17XX_SER_1
Preliminary data sheet
Figure 7:
fgpi_d_valid
fgpi_start
fgpi_stop
fgpi_data
clk_fgpi
Back-to-back Message Passing Example
3.2.1 Minimum Message/Record Size
XXXXX
3.2 Message Passing Mode
Only active clock edges where fgpi_d_valid is asserted ‘1’ allow data samples to be
captured.
If FGPI_REC_SIZE is not a multiple of 4 bytes, the message will be written to main
memory as a series of 32-bit words. Only the last word is padded with zeroes in the
unused bit positions.
Message start is signaled on the fgpi_start pin and message stop is signaled on the
fgpi_stop pin. See FGPI_CTL.MSG_START and FGPI_CTL.MSG_STOP for
selecting which edge will be active.
Figure 7
start event is set to the falling edge of fgpi_start and the message stop event is set to
the rising edge of fgpi_stop.
Message mode requires both fgpi_start and fgpi_stop signals to operate. There is no
external buffer sync available. Buffers are switched when the number of messages
received equals the value programmed into the FGPI_SIZE register.
If the incoming message length is greater than the value programmed into the
FGPI_REC_SIZE register, the message is truncated and the OVERFLOW interrupt is
generated (if enabled).
THE MINIMUM MESSAGE SIZE is 2, that is, FGPI_REC_SIZE must be programmed
greater than 1.
There is a limit to the message size when back-to-back messages are received.
If the sample size is 32-bits AND TSTAMP_SELECT = ‘1’ AND VAR_LENGTH =
‘1’ then the minimum message size is 3 (due to the insertion of 2 32-bit words into
the message packet).
D1
illustrates an example of a two 8-sample message transfer. The message
D2
Rev. 1 — 17 March 2006
D3
Chapter 14: FGPI: Fast General Purpose Interface
D4
D5
D6
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
D7
PNX17xx Series
D8
XXX
14-14
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