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NXP Semiconductors
PNX15xx/952x Series
Volume 1 of 1
Chapter 13: FGPO: Fast General Purpose Output
PNX15XX_PNX952X_SER_N_4
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 4.0 — 03 December 2007
13-479
7:5
BUF_SYNC
R/W
000
Encodes function of fgpo_buf_sync in record mode. Encodes to
000 in message mode:
000 = No buffer sync, ignores fgpo_buf_sync input. Switch to
alternate buffer at EOB (End-Of-Buffer). Start rst buffer
immediately after OUTPUT_ENABLE_1 (bit 12 above) is set.
001 = Wait FGPO_BUF_GAP clock pulses before switch to
alternate buffer. Ignores fgpo_buf_sync input. Start rst buffer
immediately after OUTPUT_ENABLE_1 (bit 12 above) is set.
010 = same as 000 above.
011 = same as 001 above.
100 = Switch buffers on rising edge on fgpo_buf_sync input.
Wait for next rising edge on fgpo_buf_sync input, after
OUTPUT_ENABLE_1 (bit 12 above) is set, to start rst buffer.
101 = Switch buffers on falling edge on fgpo_buf_sync input.
Wait for next falling edge on fgpo_buf_sync input, after
OUTPUT_ENABLE_1 (bit 12 above) is set, to start rst buffer.
110 = Switch buffers on alternate rising and falling edges on
fgpo_buf_sync input. Wait for next rising edge on
fgpo_buf_sync input, after OUTPUT_ENABLE_1 (bit 12 above)
is set, to start rst buffer.
111 = Switch buffers on alternate edges on fgpo_buf_sync
input. Wait for next falling edge on fgpo_buf_sync input, after
OUTPUT_ENABLE_1 (bit 12 above) is set, to start rst buffer.
4
Reserved
R
0
To ensure software backward compatibility unused or reserved bits
must be written as zeros and ignored upon read.
3:2
REC_SYNC
R/W
00
Encodes function of fgpo_rec_sync in record/message mode.
00 = No record/message sync, ignores fgpo_rec_sync input.
Switch to next record at EOR/EOM (End-Of-Record / End-Of-
Message). Start rst record/message immediately after
OUTPUT_ENABLE_1 (bit 12 above) is set.
01 = Wait FGPO_REC_GAP clock pulses before starting next
record/message. Ignores fgpo_buf_sync input. Start rst
record/message immediately after OUTPUT_ENABLE_1 (bit 12
above) is set.
10 = Start record/message on fgpo_rec_sync rising edge.
11 = Start record/message on fgpo_rec_sync falling edge.
Table 3: Fast general purpose output (FGPO) …Continued
Bit
Symbol
Acces
s
Value
Description